• Simple circuit to flash an LED from RF

    From amdx@21:1/5 to All on Sun Jul 31 10:56:27 2022
    I'd like to setup a high Q LC to receive a local Radio station probably charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

                                    Thanks, Mikek

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  • From jlarkin@highlandsniptechnology.com@21:1/5 to amdx on Sun Jul 31 12:58:47 2022
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek

    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

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  • From Klaus Kragelund@21:1/5 to jlarkin@highlandsniptechnology.com on Mon Aug 1 03:13:19 2022
    31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek

    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.


    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED


    --
    Klaus

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  • From boB@21:1/5 to klauskvik@hotmail.com on Sun Jul 31 17:35:03 2022
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klauskvik@hotmail.com> wrote:

    31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I >>>don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek

    I expect that a strong radio station could light an LED visibly >>continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.


    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED


    Yes, I was thinking an L-C circuit to boost the voltage at least.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.

    boB

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  • From amdx@21:1/5 to jlarkin@highlandsniptechnology.com on Sun Jul 31 19:54:46 2022
    On 7/31/2022 2:58 PM, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably
    charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

                                    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    I was hoping to do it with just a coil and cap. I have some 6" coils with
    Q over 1000. Very high impedance a resonance, so might need a lower
    impedance pickup coil.
    Their Litz wire, so I don't want to tap them.

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  • From amdx@21:1/5 to boB on Sun Jul 31 20:11:54 2022
    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klauskvik@hotmail.com> wrote:

    31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0 >>>
    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED

    Yes, I was thinking an L-C circuit to boost the voltage at least.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.

    boB

    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall I was trying to show how match was important to power transfer nothing major
    just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I
    try LT spice. I just said Fuck it. Haven't touched it since.
    Mikek


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  • From jlarkin@highlandsniptechnology.com@21:1/5 to amdx on Sun Jul 31 19:07:49 2022
    On Sun, 31 Jul 2022 20:11:54 -0500, amdx <amdx@knology.net> wrote:

    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klauskvik@hotmail.com> wrote:

    31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I >>>>> don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0 >>>>
    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED

    Yes, I was thinking an L-C circuit to boost the voltage at least.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.

    boB

    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall I was >trying to show how match was important to power transfer nothing major
    just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I
    try LT spice. I just said Fuck it. Haven't touched it since.
    Mikek

    LT Spice will teach you electronics! And train your instincts.

    My office gets a gigantic RF field from Sutro Tower. I've been meaning
    to try to light an LED from that.

    A broadband match could scoop up an entire band, not just one station.
    When I was a kid, I had a crystal set with a germanium diode and hi-z
    magnetic headphones. On some stations, it was deafening. Had to be
    many milliwatts.

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  • From jlarkin@highlandsniptechnology.com@21:1/5 to amdx on Sun Jul 31 19:10:28 2022
    On Sun, 31 Jul 2022 19:54:46 -0500, amdx <amdx@knology.net> wrote:

    On 7/31/2022 2:58 PM, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably
    charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    I was hoping to do it with just a coil and cap. I have some 6" coils with
    Q over 1000. Very high impedance a resonance, so might need a lower
    impedance pickup coil.
    Their Litz wire, so I don't want to tap them.

    You might consider a tuned loop antenna.

    What frequency stations do you have nearby?

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  • From whit3rd@21:1/5 to amdx on Sun Jul 31 20:04:53 2022
    On Sunday, July 31, 2022 at 6:12:02 PM UTC-7, amdx wrote:
    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klau...@hotmail.com> wrote:

    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED


    Yes, I was thinking an L-C circuit to boost the voltage at least.

    That's important because the 'diode' isn't usually as sensitive as a crystal set
    (which has terrible breakdown, but good low-bias energy efficiency)
    Antennae have impedance, is matters what kind of antenna you connect.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.

    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall I was trying to show how match was important to power transfer nothing major
    just maximum power transfer, I posted it here
    got a shit load of flack...

    When you start using an LC tank, the 'maximum power transfer' trick of impedance
    matching becomes irrelevant, because the LC has a flywheel effect (doesn't lose energy
    just because it didn't deliver it to the capacitor). It also has free transformer voltage 'gain',
    but you'd want to use a tapped loopstick with sliding core to tune; that's a nightmare
    to characterize in SPICE parameters. You'd also want to slowly charge
    a capacitor to above-LED voltage, then abruptly discharge it, which is a transient
    that LTspice can handle, but only with amazing amounts of compute time.

    Using LTspice in that effort is excessively hard.

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  • From amdx@21:1/5 to jlarkin@highlandsniptechnology.com on Mon Aug 1 07:40:20 2022
    On 7/31/2022 9:10 PM, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 19:54:46 -0500, amdx <amdx@knology.net> wrote:

    On 7/31/2022 2:58 PM, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

                                    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0 >>>
    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    I was hoping to do it with just a coil and cap. I have some 6" coils with
    Q over 1000. Very high impedance a resonance, so might need a lower
    impedance pickup coil.
    Their Litz wire, so I don't want to tap them.
    You might consider a tuned loop antenna.

    What frequency stations do you have nearby?

    I have a strong local on 1290, which is right about the Q peak of my 6"
    coils.
    I do have a 2 ft, loop antenna that will rotate and do azimuth tilt. I
    can put a portable radio in the
    middle of that and it makes big signal difference.
     I can also get 870 WWL in New Orleans on a portable :-) From Panama
    City Fl.
                                         Mikek


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  • From amdx@21:1/5 to All on Mon Aug 1 07:21:59 2022
    On 7/31/2022 10:04 PM, whit3rd wrote:
    On Sunday, July 31, 2022 at 6:12:02 PM UTC-7, amdx wrote:
    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klau...@hotmail.com> wrote:
    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED

    Yes, I was thinking an L-C circuit to boost the voltage at least.
    That's important because the 'diode' isn't usually as sensitive as a crystal set
    (which has terrible breakdown, but good low-bias energy efficiency)
    Antennae have impedance, is matters what kind of antenna you connect.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.
    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall I was >> trying to show how match was important to power transfer nothing major
    just maximum power transfer, I posted it here
    got a shit load of flack...
    When you start using an LC tank, the 'maximum power transfer' trick of impedance
    matching becomes irrelevant, because the LC has a flywheel effect (doesn't lose energy
    just because it didn't deliver it to the capacitor). It also has free transformer voltage 'gain',
    but you'd want to use a tapped loopstick with sliding core to tune; that's a nightmare
    to characterize in SPICE parameters. You'd also want to slowly charge
    a capacitor to above-LED voltage, then abruptly discharge it, which is a transient
    that LTspice can handle, but only with amazing amounts of compute time.

     I disagree with that irrelevant comment, you don't want to overload
    the tank, you want to keep the voltage up to stay higher on the diode
    slope, (so called knee).
    Tanks are tapped or coupled to reduce loading on high end crystal sets.
    Diodes are picked specifically to go with the Q of your LC. Coupling is
    often done by
    variable spacing between two tuned LC tank circuits.
    For any high end Crystal set, the LC, they are capacitor tuned not
    inductor tuned, that's fun but not used in high end units. Some crystal
    sets, have a separate LC tuned
     to a local station that charges a cap to power an audio amplifier for
    the audio when listening to distant stations.
      Sadly the best Crystal radio forum has died after the holder got
    Covid, had terrible health problems and the URL fee didn't get paid.
    Here is the mother load of Crystal radio study, done by Ben Tongue of Blonder-Tongue fame.
    http://kearman.com/bentongue/xtalset/xtalset.html
              Mikek


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  • From Ralph Mowery@21:1/5 to All on Mon Aug 1 15:31:18 2022
    In article <tc788p$hbqe$1@dont-email.me>, amdx@knology.net says...
    I'd like to setup a high Q LC to receive a local Radio station probably
    charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek



    How far away from the station and whas there frequency and power ?

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  • From John Larkin@21:1/5 to All on Mon Aug 1 12:24:07 2022
    On Sun, 31 Jul 2022 20:04:53 -0700 (PDT), whit3rd <whit3rd@gmail.com>
    wrote:

    On Sunday, July 31, 2022 at 6:12:02 PM UTC-7, amdx wrote:
    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klau...@hotmail.com> wrote:

    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED


    Yes, I was thinking an L-C circuit to boost the voltage at least.

    That's important because the 'diode' isn't usually as sensitive as a crystal set
    (which has terrible breakdown, but good low-bias energy efficiency)
    Antennae have impedance, is matters what kind of antenna you connect.

    A modern schottky diode is better than an old point-contact germanium.
    And an LED needs volts, so diode drop isn't a big deal.

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  • From Martin Brown@21:1/5 to Klaus Kragelund on Tue Aug 2 12:42:07 2022
    On 01/08/2022 01:13, Klaus Kragelund wrote:
    31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station
    probably charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    ������������������������������� Thanks, Mikek

    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.


    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED

    I vaguely recall an ancient bipolar transistor low leakage thyristor
    functional equivalent that could be used to flash an LED brightly but
    very slowly depending on charging of a low leakage reservoir capacitor.

    It snapped into conduction when the voltage reached about 4v.

    It was briefly in vogue for flashing them in the early red LED era just
    prior to UJTs becoming common and cheap.

    --
    Regards,
    Martin Brown

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  • From Ricky@21:1/5 to amdx on Tue Aug 2 05:36:37 2022
    On Sunday, July 31, 2022 at 8:54:55 PM UTC-4, amdx wrote:
    On 7/31/2022 2:58 PM, jla...@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    I was hoping to do it with just a coil and cap. I have some 6" coils with
    Q over 1000. Very high impedance a resonance, so might need a lower impedance pickup coil.
    Their Litz wire, so I don't want to tap them.

    A high-Q circuit is going to be useless in this application, because you need to draw power which will spoil the Q of any high-Q circuit. The only use of a high-Q circuit would be for tuning, but with the power you are drawing off, it won't be high-Q
    anymore, just a tuned circuit.


    --

    Rick C.

    - Get 1,000 miles of free Supercharging
    - Tesla referral code - https://ts.la/richard11209

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  • From Ricky@21:1/5 to amdx on Tue Aug 2 05:40:05 2022
    On Sunday, July 31, 2022 at 9:12:02 PM UTC-4, amdx wrote:
    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klau...@hotmail.com> wrote:

    31.07.22 22:58, jla...@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I >>>> don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0 >>>
    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED

    Yes, I was thinking an L-C circuit to boost the voltage at least.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.

    boB

    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall I was trying to show how match was important to power transfer nothing major
    just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I
    try LT spice. I just said Fuck it. Haven't touched it since.

    LTspice is a PITA. Some of your circuits will likely need custom modules. The documentation for these things is byzantine. You will need to use the LTspice groups for help and you will get multiple, conflicting advice.

    LTspice is not for the faint of heart. Also, you do need to understand electronics theory enough to know when your circuit is mucked up and lying to you.

    --

    Rick C.

    + Get 1,000 miles of free Supercharging
    + Tesla referral code - https://ts.la/richard11209

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  • From Jan Panteltje@21:1/5 to gnuarm.deletethisbit@gmail.com on Tue Aug 2 12:59:39 2022
    On a sunny day (Tue, 2 Aug 2022 05:36:37 -0700 (PDT)) it happened Ricky <gnuarm.deletethisbit@gmail.com> wrote in <e2885266-349e-4dfa-b728-6c4279190f09n@googlegroups.com>:

    A high-Q circuit is going to be useless in this application, because you need >to draw power which will spoil the Q of any high-Q circuit. The only use
    of a high-Q circuit would be for tuning, but with the power you are drawing >off, it won't be high-Q anymore, just a tuned circuit.

    You could use the high Q and a diode to slowly charge a capacitor.

    But need more info, field strength, frequency etc.

    For 10$ you can get a good RF detector on ebay, I have one.

    You could use a mechanical mirco-amp meter and have the hand touch an electrode.
    In my case I needed nothing, just a LED connected to my 27 MHz GPA antenna would flash any time the across the road neighbor turned on his transmitter,
    I asked him what power he was using (4 W was legal limit for CB here back then) but no answer to that question, some used more like 400 W (Italians I have heard).

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  • From Jeroen Belleman@21:1/5 to All on Tue Aug 2 15:11:10 2022
    On Sunday, July 31, 2022 at 9:12:02 PM UTC-4, amdx wrote:
    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klau...@hotmail.com> wrote:

    31.07.22 22:58, jla...@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I >>>>>> don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and >>>>> use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0 >>>>>
    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED

    Yes, I was thinking an L-C circuit to boost the voltage at least.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.

    boB

    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall I was >> trying to show how match was important to power transfer nothing major
    just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I
    try LT spice. I just said Fuck it. Haven't touched it since.

    It's a bit of a pity that you let the opinions of others deprive you
    of a useful tool. Spice has its quirks, but it can help a lot, once
    you get the hang of it.

    Don't try to use it to simulate complete complex circuits.

    Jeroen Belleman

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  • From legg@21:1/5 to amdx on Tue Aug 2 08:52:35 2022
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek

    So try charging a cap first.

    RL

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  • From jlarkin@highlandsniptechnology.com@21:1/5 to jeroen@nospam.please on Tue Aug 2 06:58:43 2022
    On Tue, 02 Aug 2022 15:11:10 +0200, Jeroen Belleman
    <jeroen@nospam.please> wrote:

    On Sunday, July 31, 2022 at 9:12:02 PM UTC-4, amdx wrote:
    On 7/31/2022 7:35 PM, boB wrote:
    On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
    <klau...@hotmail.com> wrote:

    31.07.22 22:58, jla...@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote: >>>>>>
    I'd like to setup a high Q LC to receive a local Radio station probably >>>>>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I >>>>>>> don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and >>>>>> use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff >>>>>> like this.

    Tuned LC with diode to big low leakage cap

    Then a BJT multivibrator, can operate in nA
    Assign very low duty cycle for LED

    Yes, I was thinking an L-C circuit to boost the voltage at least.

    LTspice can be downloaded for free from www.analog.com

    I suggest you get it.

    boB

    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall I was >>> trying to show how match was important to power transfer nothing major
    just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I
    try LT spice. I just said Fuck it. Haven't touched it since.

    It's a bit of a pity that you let the opinions of others deprive you
    of a useful tool. Spice has its quirks, but it can help a lot, once
    you get the hang of it.

    I have got people started on LT Spice, entering and running a basic
    circuit, in 5 minutes.

    I often use it instead of a calculator, for simple stuff like voltage
    dividers and rc circuits. Unlike a calculator, it leaves a record.


    Don't try to use it to simulate complete complex circuits.

    Not entire products, but pretty hairy subsystems.

    https://www.dropbox.com/s/dv9qiy2z3x2bxhk/P942_18.jpg?raw=1

    As Mike said, the main function of Spice is to train your instincts.

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  • From Mike Monett@21:1/5 to Martin Brown on Tue Aug 2 14:15:17 2022
    Martin Brown <'''newspam'''@nonad.co.uk> wrote:

    [...]

    I vaguely recall an ancient bipolar transistor low leakage thyristor functional equivalent that could be used to flash an LED brightly but
    very slowly depending on charging of a low leakage reservoir capacitor.

    It snapped into conduction when the voltage reached about 4v.

    It was briefly in vogue for flashing them in the early red LED era just
    prior to UJTs becoming common and cheap.

    I vaguely recall the same thing. I tried to reconstruct it, but only got
    one snap and then it hung. I searched through analogspiceman's files and couldn't find anything. But it's out there somewhere. Here's my offering:

    Version 4
    SHEET 1 1608 1700
    WIRE 352 -304 304 -304
    WIRE 464 -304 432 -304
    WIRE 512 -304 464 -304
    WIRE 608 -304 512 -304
    WIRE 304 -288 304 -304
    WIRE 608 -272 608 -304
    WIRE 464 -240 464 -304
    WIRE 304 -192 304 -208
    WIRE 608 -192 608 -208
    WIRE 400 -112 400 -192
    WIRE 464 -64 464 -144
    WIRE 400 0 400 -16
    FLAG 304 -192 0
    FLAG 400 0 0
    FLAG 608 -192 0
    FLAG 512 -304 Q2E
    SYMBOL voltage 304 -304 R0
    WINDOW 123 0 0 Left 2
    WINDOW 39 0 0 Left 2
    SYMATTR InstName V1
    SYMATTR Value 5
    SYMBOL npn 464 -112 M0
    SYMATTR InstName Q1
    SYMATTR Value 2N3904
    SYMBOL pnp 400 -144 M180
    WINDOW 0 43 35 Left 2
    WINDOW 3 39 62 Left 2
    SYMATTR InstName Q2
    SYMATTR Value 2N3906
    SYMBOL res 448 -320 R90
    WINDOW 0 0 56 VBottom 2
    WINDOW 3 32 56 VTop 2
    SYMATTR InstName R1
    SYMATTR Value 10k
    SYMBOL cap 592 -272 R0
    SYMATTR InstName C1
    SYMATTR Value 1uf
    TEXT 376 -424 Left 2 ;'2N3904/06 SCR
    TEXT 376 -392 Left 2 !.tran 0 10m 0
    TEXT 576 -392 Left 2 !.options plotwinsize=0




    --
    MRM

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  • From amdx@21:1/5 to Ricky on Tue Aug 2 12:04:53 2022
    On 8/2/2022 7:36 AM, Ricky wrote:
    On Sunday, July 31, 2022 at 8:54:55 PM UTC-4, amdx wrote:
    On 7/31/2022 2:58 PM, jla...@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I
    don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0 >>>
    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    I was hoping to do it with just a coil and cap. I have some 6" coils with
    Q over 1000. Very high impedance a resonance, so might need a lower
    impedance pickup coil.
    Their Litz wire, so I don't want to tap them.
    A high-Q circuit is going to be useless in this application, because you need to draw power which will spoil the Q of any high-Q circuit. The only use of a high-Q circuit would be for tuning, but with the power you are drawing off, it won't be high-Q
    anymore, just a tuned circuit.


    Someone can LT spice that and compare a 1200 Q LC to a 200 Q LC.
    Show I'm
     right!    Or wrong.

    --
    This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

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  • From Ricky@21:1/5 to amdx on Tue Aug 2 11:05:09 2022
    On Tuesday, August 2, 2022 at 1:05:00 PM UTC-4, amdx wrote:
    On 8/2/2022 7:36 AM, Ricky wrote:
    On Sunday, July 31, 2022 at 8:54:55 PM UTC-4, amdx wrote:
    On 7/31/2022 2:58 PM, jla...@highlandsniptechnology.com wrote:
    On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

    I'd like to setup a high Q LC to receive a local Radio station probably >>>> charging a cap, when the charge is high enough flash an LED.
    Maybe set the trigger point of an SCR, or could just a zener do it. I >>>> don't have LT spice, so please don't post and answer with that.

    Thanks, Mikek
    I expect that a strong radio station could light an LED visibly
    continuously, given a good well-matched antenna. Or charge a cap and
    use a discharge circuit to get bright blinks.

    Here's my high-voltage low current blinker:

    https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

    But LT Spice is free, easy to learn, and a wonderful tool for stuff
    like this.

    I was hoping to do it with just a coil and cap. I have some 6" coils with >> Q over 1000. Very high impedance a resonance, so might need a lower
    impedance pickup coil.
    Their Litz wire, so I don't want to tap them.
    A high-Q circuit is going to be useless in this application, because you need to draw power which will spoil the Q of any high-Q circuit. The only use of a high-Q circuit would be for tuning, but with the power you are drawing off, it won't be high-Q
    anymore, just a tuned circuit.


    Someone can LT spice that and compare a 1200 Q LC to a 200 Q LC.
    Show I'm
    right! Or wrong.

    You might try LTspice with this file. It seems to contain descriptions for all the parts. So you won't have to learn how to incorporate models which can be a clumsy part of the job.

    I seem to recall, the basic parts like L and C will include a tiny bit of R by default because the simulations can go wonky when the Q is infinite. So you will need to adjust those parasitic values to set your Q. I expect you know how to do that.


    --

    Rick C.

    -- Get 1,000 miles of free Supercharging
    -- Tesla referral code - https://ts.la/richard11209

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  • From Johann Klammer@21:1/5 to amdx on Wed Aug 3 11:42:45 2022
    On 08/01/2022 03:11 AM, amdx wrote:
    Ya, I had it for a while played with it had fun with it, I did some circuits, went out and got subcircuits, all was cool and as I recall I was
    trying to show how match was important to power transfer nothing major just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I try LT spice. I just said Fuck it. Haven't touched it since.
    Mikek


    The thing when posting to usenset is that you should never ever read any of the replies.

    --- SoupGate-Win32 v1.05
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  • From amdx@21:1/5 to Johann Klammer on Wed Aug 3 11:03:23 2022
    On 8/3/2022 4:42 AM, Johann Klammer wrote:
    On 08/01/2022 03:11 AM, amdx wrote:
    Ya, I had it for a while played with it had fun with it, I did some circuits, went out and got subcircuits, all was cool and as I recall I was
    trying to show how match was important to power transfer nothing major just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I try LT spice. I just said Fuck it. Haven't touched it since.
    Mikek


    The thing when posting to usenset is that you should never ever read any of the replies.
    Yep, but still I read this.

    --
    This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

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  • From John Larkin@21:1/5 to klammerj@NOSPAM.a1.net on Wed Aug 3 10:24:04 2022
    On Wed, 03 Aug 2022 11:42:45 +0200, Johann Klammer
    <klammerj@NOSPAM.a1.net> wrote:

    On 08/01/2022 03:11 AM, amdx wrote:
    Ya, I had it for a while played with it had fun with it, I did some circuits, went out and got subcircuits, all was cool and as I recall I was
    trying to show how match was important to power transfer nothing major just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I try LT spice. I just said Fuck it. Haven't touched it since.
    Mikek


    The thing when posting to usenset is that you should never ever read any of the replies.

    Like the famous Signetics WOM ic, the write-only memory.

    100% production yield.

    Of course, you won't see this.

    --- SoupGate-Win32 v1.05
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  • From Phil Hobbs@21:1/5 to John Larkin on Wed Aug 3 14:30:29 2022
    John Larkin wrote:
    On Wed, 03 Aug 2022 11:42:45 +0200, Johann Klammer
    <klammerj@NOSPAM.a1.net> wrote:

    On 08/01/2022 03:11 AM, amdx wrote:
    Ya, I had it for a while played with it had fun with it, I did some circuits, went out and got subcircuits, all was cool and as I recall I was
    trying to show how match was important to power transfer nothing major just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics before I try LT spice. I just said Fuck it. Haven't touched it since.
    Mikek


    The thing when posting to usenset is that you should never ever read any of the replies.

    Like the famous Signetics WOM ic, the write-only memory.

    100% production yield.

    Of course, you won't see this.


    The plot of "pins remaining vs. socket insertions" is a classic in itself.

    Cheers

    Phil Hobbs

    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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  • From Phil Hobbs@21:1/5 to Phil Hobbs on Wed Aug 3 14:40:57 2022
    Phil Hobbs wrote:
    John Larkin wrote:
    On Wed, 03 Aug 2022 11:42:45 +0200, Johann Klammer
    <klammerj@NOSPAM.a1.net> wrote:

    On 08/01/2022 03:11 AM, amdx wrote:
    Ya, I had it for a while played with it had fun with it, I did some
    circuits, went out and got subcircuits, all was cool and as I recall
    I was
    trying to show how match was important to power transfer nothing
    major just maximum power transfer, I posted it here
    got a shit load of flack, was told I need to learn electronics
    before I try LT spice. I just said Fuck it. Haven't touched it since.
    Mikek


    The thing when posting to usenset is that you should never ever read
    any of the replies.

    Like the famous Signetics WOM ic, the write-only memory.

    100% production yield.

    Of course, you won't see this.


    The plot of "pins remaining vs. socket insertions" is a classic in itself.


    I put it at <https://electrooptical.net/www/sed/Signetics25120WriteOnlyMemory_WOM_.pdf>
    for anyone who hasn't seen it.

    Cheers

    Phil Hobbs


    --
    Dr Philip C D Hobbs
    Principal Consultant
    ElectroOptical Innovations LLC / Hobbs ElectroOptics
    Optics, Electro-optics, Photonics, Analog Electronics
    Briarcliff Manor NY 10510

    http://electrooptical.net
    http://hobbs-eo.com

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