I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened >albert@cherry.(none) (albert) wrote in ><nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that >>computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened >albert@cherry.(none) (albert) wrote in ><nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that >>computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
On Sat, 6 Jan 2024 16:45:37 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
I can add one factoid: In Swedish (and perhaps all Nordic languages),
one literally says that a cat "spins" to say that it is purring.
Joe Gwinn
On 2024-01-06 11:03, John Larkin wrote:
On Sat, 06 Jan 2024 14:31:49 +0100, albert@cherry.(none) (albert)
wrote:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
1v should be easy with a ge transistor.
People make oscillators that run off 10s of mV, but they usually use
jfets. A depletion phemt would be interesting.
Play with some ciruits in LTspice and post them here if you'd like us
to discuss them.
Is there an LT model of a germanium transistor?
Do you have an oscilloscope?
One issue with old germanium transistors is that they have horrible base >leakage, enough to make the apparent beta negative in many cases.
Cheers
Phil Hobbs
On Sat, 06 Jan 2024 14:31:49 +0100, albert@cherry.(none) (albert)
wrote:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
1v should be easy with a ge transistor.
People make oscillators that run off 10s of mV, but they usually use
jfets. A depletion phemt would be interesting.
Play with some ciruits in LTspice and post them here if you'd like us
to discuss them.
Is there an LT model of a germanium transistor?
Do you have an oscilloscope?
On Sat, 06 Jan 2024 13:31:28 -0500, Joe Gwinn <joegwinn@comcast.net>
wrote:
On Sat, 6 Jan 2024 16:45:37 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see: >>>"First gain is a cat spinning. ". This is an expression I have never >>>heard before, could you tell me what it means?
I can add one factoid: In Swedish (and perhaps all Nordic languages),
one literally says that a cat "spins" to say that it is purring.
Joe Gwinn
There is actually an issued patent on using a laser pointer to make a
cat spin.
On 06/01/2024 16:45, Liz Tuddenham wrote:
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
This, perhaps?
https://en.wikipedia.org/wiki/Buttered_cat_paradox
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
On Sat, 6 Jan 2024 16:45:37 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
I can add one factoid: In Swedish (and perhaps all Nordic languages),
one literally says that a cat "spins" to say that it is purring.
On Sat, 06 Jan 2024 14:50:17 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
Or something like this
https://ecstudiosystems.com/discover/textbooks/basic-electronics/oscillators/images/colpitts-oscillator.jpg
except it needs a power supply.
We were just discussing source-follower Colpitts oscillators yesterday
and concluded that we don't understand them.
Joe Gwinn <joegwinn@comcast.net> wrote:
On Sat, 6 Jan 2024 16:45:37 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
I can add one factoid: In Swedish (and perhaps all Nordic languages),
one literally says that a cat "spins" to say that it is purring.
Could this be a reference to the rising and falling purring noise a
spinning wheel makes?
On Saturday, January 6, 2024 at 5:31:59?AM UTC-8, none albert wrote:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
Sure, you can make an oscillator; a one-transistor blocking oscillator
that saturates a magnetic core.
As for 'LTSpice' exercises, that's harder; the way a blocking oscillator >works, is by saturating the inductor metal.
That's completely a nonlinear process, doesn't fit the 'ideal transformer' model
at all. It requires a nonlinear inductor model...
On 2024-01-06 11:03, John Larkin wrote:
On Sat, 06 Jan 2024 14:31:49 +0100, albert@cherry.(none) (albert)
wrote:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
1v should be easy with a ge transistor.
People make oscillators that run off 10s of mV, but they usually use
jfets. A depletion phemt would be interesting.
Play with some ciruits in LTspice and post them here if you'd like us
to discuss them.
Is there an LT model of a germanium transistor?
Do you have an oscilloscope?
One issue with old germanium transistors is that they have horrible base leakage, enough to make the apparent beta negative in many cases.
Cheers
Phil Hobbs
On 1/6/24 17:13, John Larkin wrote:
On Sat, 06 Jan 2024 14:50:17 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
Or something like this
https://ecstudiosystems.com/discover/textbooks/basic-electronics/oscillators/images/colpitts-oscillator.jpg
except it needs a power supply.
We were just discussing source-follower Colpitts oscillators yesterday
and concluded that we don't understand them.
To first order, it doesn't really matter which terminal you select
to be at AC GND.
The active device has gain -S*Ui*Zl, with Zl being a tank circuit.
Ui is derived from a tap on that tank, which allows you to work
out the loop gain. The loop gain needs to be unity at the tank
resonance. (Usually a bit greater, until some non-linearity at
large amplitude reduces it to unity.)
In the picture you referred to above, Zl is the series combination
of L and C2, with C1 in parallel across both. Ui is the voltage
across C2. They way it is drawn doesn't really help. It's the same
circuit, but I prefer to draw it like this:
+-----+-----+
| | |
L | |
| d |
+----g = C1
| s |
= C2 | |
| | |
+-----+-----+
Substitute cbe for dgs if you want, it's the same thing.
In article <unbpba$35rk$1@solani.org>,
Jan Panteltje <alien@comet.invalid> wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened >>albert@cherry.(none) (albert) wrote in >><nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that >>>computers made of discrete germanium transistors were decommissioned. >>>Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
That sounds trivial. It is trivial. Not for me.
I need a schematic to build. Surely there must be some current into the base >for startup?
Groetjes Albert
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
On a sunny day (Sat, 6 Jan 2024 23:15:07 +0100) it happened Jeroen Belleman <jeroen@nospam.please> wrote in <uncjc2$p3ru$1@dont-email.me>:
On 1/6/24 17:13, John Larkin wrote:
On Sat, 06 Jan 2024 14:50:17 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned. >>>>> Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
Or something like this
https://ecstudiosystems.com/discover/textbooks/basic-electronics/oscillators/images/colpitts-oscillator.jpg
except it needs a power supply.
We were just discussing source-follower Colpitts oscillators yesterday
and concluded that we don't understand them.
To first order, it doesn't really matter which terminal you select
to be at AC GND.
The active device has gain -S*Ui*Zl, with Zl being a tank circuit.
Ui is derived from a tap on that tank, which allows you to work
out the loop gain. The loop gain needs to be unity at the tank
resonance. (Usually a bit greater, until some non-linearity at
large amplitude reduces it to unity.)
In the picture you referred to above, Zl is the series combination
of L and C2, with C1 in parallel across both. Ui is the voltage
across C2. They way it is drawn doesn't really help. It's the same
circuit, but I prefer to draw it like this:
+-----+-----+
| | |
L | |
| d |
+----g = C1
| s |
= C2 | |
| | |
+-----+-----+
Substitute cbe for dgs if you want, it's the same thing.
When frequencies get higher:
https://panteltje.online/pub/2.4GHz_twisted_oscillator_IMG_3629.GIF
panteltje.online/pub/twisted_wire_oscillator_IMG_6629.JPG
John Larking may like that :-)
But the OP's Ge transistors will likely not go that high.
I don't know the origin. Not German. Nor Icelandic (which is
basically Old Norse). But it is true in Norwegian, and Danish.
On Sunday, January 7, 2024 at 2:07:40 AM UTC+11, none albert wrote:
In article <unbpba$35rk$1...@solani.org>,
Jan Panteltje <al...@comet.invalid> wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happenedThat sounds trivial. It is trivial. Not for me.
albert@cherry.(none) (albert) wrote in
<nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
I need a schematic to build. Surely there must be some current into the base >> for startup?
You could try the Baxandall class-D oscillator
http://sophia-elektronica.com/Baxandall1959JM.pdf
but pay attention to the footnote on page 752. You'll have to chose turns ratios that give you enough base drive, but your should be able to put something
together that runs from a 1V supply voltage if you are using germanium transistors.
Inverted transistors offer very low collector saturation voltage, so you might get away with less than a volt, if you swapped collector and emitters but you
do need enough supply voltage to turn the bases on.
Bill Sloman, SydneyGroetjes Albert
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
~ Liz Tuddenham ~
none <albert@cherry.> wrote:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
Yes, but at 1V even regular silicon transistors can be used ( at least at >normal temperatures).
----
piglet
On 1/7/24 08:11, Jan Panteltje wrote:
On a sunny day (Sat, 6 Jan 2024 23:15:07 +0100) it happened Jeroen Belleman >> <jeroen@nospam.please> wrote in <uncjc2$p3ru$1@dont-email.me>:
On 1/6/24 17:13, John Larkin wrote:
On Sat, 06 Jan 2024 14:50:17 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that >>>>>> computers made of discrete germanium transistors were decommissioned. >>>>>> Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
Or something like this
https://ecstudiosystems.com/discover/textbooks/basic-electronics/oscillators/images/colpitts-oscillator.jpg
except it needs a power supply.
We were just discussing source-follower Colpitts oscillators yesterday >>>> and concluded that we don't understand them.
To first order, it doesn't really matter which terminal you select
to be at AC GND.
The active device has gain -S*Ui*Zl, with Zl being a tank circuit.
Ui is derived from a tap on that tank, which allows you to work
out the loop gain. The loop gain needs to be unity at the tank
resonance. (Usually a bit greater, until some non-linearity at
large amplitude reduces it to unity.)
In the picture you referred to above, Zl is the series combination
of L and C2, with C1 in parallel across both. Ui is the voltage
across C2. They way it is drawn doesn't really help. It's the same
circuit, but I prefer to draw it like this:
+-----+-----+
| | |
L | |
| d |
+----g = C1
| s |
= C2 | |
| | |
+-----+-----+
Substitute cbe for dgs if you want, it's the same thing.
When frequencies get higher:
https://panteltje.online/pub/2.4GHz_twisted_oscillator_IMG_3629.GIF
panteltje.online/pub/twisted_wire_oscillator_IMG_6629.JPG
John Larking may like that :-)
But the OP's Ge transistors will likely not go that high.
Nice. Apart from the gimmick, the reactive components seem to be
layout and component parasitics. That always makes me uncomfortable,
because it makes it hard to reproduce reliably.
I'd guess the gimmick is still capacitive at 2.4GHz?
In article <undq99$11a8a$1@dont-email.me>,
piglet <erichpwagner@hotmail.com> wrote:
none <albert@cherry.> wrote:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
Yes, but at 1V even regular silicon transistors can be used ( at least at
normal temperatures).
Once the oscillator works I intend to lower the voltage. That is the
one of the experiments I want to do.
On the other matter, I do not necessarily mean a sine oscillator.
Anything goes, I hear oscillators based on core saturation.
This probably means that I have to use rather small ring cores?
In article <1qmx7n9.x80ybk1jx7h1cN%liz@poppyrecords.invalid.invalid>,
Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
That is a translation error. Meant is a "cat purring".
Thanks for pointing this out.
[The "Wijze van Antrim" actually exists, in Dutch literature.]
Any ferromagnetic core material will saturate at a high enough flux -
there's nothing special about a ring core except that you get less cross-section to saturate for every gram of relatively expensive ferrite
that you buy.
Bill Sloman <bill.sloman@ieee.org> wrote:
[...]
Any ferromagnetic core material will saturate at a high enough flux -
there's nothing special about a ring core except that you get less
cross-section to saturate for every gram of relatively expensive ferrite
that you buy.
...and no air gap.
On a sunny day (Sat, 06 Jan 2024 16:07:25 +0100) it happened albert@cherry.(none) (albert) wrote in <nnd$6c23b994$17dc2f93@4e33c84aa30fc7d3>:
In article <unbpba$35rk$1@solani.org>,
Jan Panteltje <alien@comet.invalid> wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
That sounds trivial. It is trivial. Not for me.
I need a schematic to build. Surely there must be some current into the base >> for startup?
Groetjes Albert
https://panteltje.online/pub/8052AH_BASIC_computer/dc_dc_converter_detail/5V_to_30V_converter.jpg
On 07.01.24 8:22, Jan Panteltje wrote:
On a sunny day (Sat, 06 Jan 2024 16:07:25 +0100) it happenedCould you possibly show a worse picture?
albert@cherry.(none) (albert) wrote in
<nnd$6c23b994$17dc2f93@4e33c84aa30fc7d3>:
In article <unbpba$35rk$1@solani.org>,
Jan Panteltje <alien@comet.invalid> wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned. >>>>> Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
That sounds trivial. It is trivial. Not for me.
I need a schematic to build. Surely there must be some current into the base
for startup?
Groetjes Albert
https://panteltje.online/pub/8052AH_BASIC_computer/dc_dc_converter_detail/5V_to_30V_converter.jpg
Jikes.........
Joe Gwinn <joegwinn@comcast.net> wrote:
I don't know the origin. Not German. Nor Icelandic (which is
basically Old Norse). But it is true in Norwegian, and Danish.
I had a feeling the O/P was Dutch.
That sounds trivial. It is trivial. Not for me.Old GE transistors didn't need external biasing. They leaked so that
I need a schematic to build. Surely there must be some current into the base >for startup?
Groetjes Albert
Old GE transistors didn't need external biasing. They leaked so that
small signals could be amplfied without it.
lørdag den 6. januar 2024 kl. 14.31.59 UTC+1 skrev none albert:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
https://en.wikipedia.org/wiki/Joule_thief
or https://www.angelfire.com/electronic/funwithtubes/vib_psu-a.html
On Sun, 7 Jan 2024 15:12:33 -0800 (PST), Lasse Langwadt Christensen ><langwadt@fonz.dk> wrote:
lørdag den 6. januar 2024 kl. 14.31.59 UTC+1 skrev none albert:
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
https://en.wikipedia.org/wiki/Joule_thief
Some WWII-vintage infrared sniperscopes used a watch escapement to
briefly close a contact at about 1 Hz, with a D-cell driving a step-up >transformer and a cold-cathode or selenium retifier.
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
On Sat, 06 Jan 2024 14:31:49 +0100, albert@cherry.(none) (albert)
wrote:
I'm sitting on a heap of germanium transistors. From the time that >>computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
Oscillators operating at 1V and lower are basic elements of energy
scavenging circuitry.
A new design might use 0Vgs threshold mosfets. >https://www.aldinc.com/ald_zerothresholdmosfet.php
Below 700mV, a hobby circuit might benefit from a manual press-
switch to get things started - a manual charge pump. Limited
applications there.
Once an oscillation is developed, higher voltages can be generated for >conventional cctry to take over, if the source can supply the energy.
Check out ADP5090-91, MAX20361, LTC3107 and LTC3119 to 'start'.
RL
On Mon, 08 Jan 2024 11:14:08 -0500, legg <legg@nospam.magma.ca> wrote:
On Sat, 06 Jan 2024 14:31:49 +0100, albert@cherry.(none) (albert)
wrote:
I'm sitting on a heap of germanium transistors. From the time that >>>computers made of discrete germanium transistors were decommissioned. >>>Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
Oscillators operating at 1V and lower are basic elements of energy >>scavenging circuitry.
A new design might use 0Vgs threshold mosfets. >>https://www.aldinc.com/ald_zerothresholdmosfet.php
Below 700mV, a hobby circuit might benefit from a manual press-
switch to get things started - a manual charge pump. Limited
applications there.
Once an oscillation is developed, higher voltages can be generated for >>conventional cctry to take over, if the source can supply the energy.
Check out ADP5090-91, MAX20361, LTC3107 and LTC3119 to 'start'.
RL
Enhancment-mode phemts, like SAV541, are cool. Turn-on threshold is
0.26v typ, and it goes to about 3 ohms rds-on with 0.5 on the gate.
On Sat, 06 Jan 2024 14:31:49 +0100, albert@cherry.(none) (albert)
wrote:
I'm sitting on a heap of germanium transistors. From the time that >>computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
Groetjes Albert
1v should be easy with a ge transistor.
People make oscillators that run off 10s of mV, but they usually use
jfets. A depletion phemt would be interesting.
Play with some ciruits in LTspice and post them here if you'd like us
to discuss them.
Is there an LT model of a germanium transistor?
Do you have an oscilloscope?
On Monday, January 8, 2024 at 8:05:12 AM UTC+11, Joe Gwinn wrote:
On Sun, 7 Jan 2024 09:42:23 +0000, l...@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
Joe Gwinn <joeg...@comcast.net> wrote:Turns out to be true.
I don't know the origin. Not German. Nor Icelandic (which is
basically Old Norse). But it is true in Norwegian, and Danish.
I had a feeling the O/P was Dutch.
I checked Dutch, which it turns out also spins its cats, and oil is
olie. So it almost parallels Swedish, Norwegian, and Danish. Maybe
the connecting theme is who conquered who over the centuries.
Not in this case. The Dutch republic in its glory days had a large printed industry , which exported to most of northern Europe, in Dutch.
The Germans - mostly Frederick the Great - invented high German to minimise their cultural influence, and boost their own printing industry, Noah Webster--
style. Military conquest didn't really come into it - at least not directly.
--
Bill Sloman, Sydney
albert <albert@cherry.(none)> wrote:
In article <1qmx7n9.x80ybk1jx7h1cN%liz@poppyrecords.invalid.invalid>,
Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:
albert <albert@cherry.(none)> wrote:
[...]
I realise this is completely off-topic but in your signature I see:
"First gain is a cat spinning. ". This is an expression I have never
heard before, could you tell me what it means?
That is a translation error. Meant is a "cat purring".
Thanks for pointing this out.
[The "Wijze van Antrim" actually exists, in Dutch literature.]
Thanks, does it mean something like: "You know you are winning when the
cat begins to purr"?
It is always interesting to see wise sayings from other languages.
Dutch seems to be particularly rich in these - the Dutch sense of humour
is very similar to a certain type of English humour that appeals to me.
-
~iz Tuddenham ~
Some WWII-vintage infrared sniperscopes used a watch escapement to
briefly close a contact at about 1 Hz, with a D-cell driving a step-up >transformer and a cold-cathode or selenium retifier.
In article <1qmyorb.1du7clv1xyko8wN%liz@poppyrecords.invalid.invalid>,[...]
Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:
Thanks, does it mean something like: "You know you are winning when the
cat begins to purr"?
No. All these expressions means approximately the same thing.
If make profit early, that means nothing. It is a promise and it
is nice, like a cat purring, it buys you nothing.
Bill Sloman <bill.sloman@ieee.org> wrote:
[...]
Any ferromagnetic core material will saturate at a high enough flux -
there's nothing special about a ring core except that you get less
cross-section to saturate for every gram of relatively expensive ferrite
that you buy.
...and no air gap.
On 8/01/2024 2:07 am, Liz Tuddenham wrote:
Bill Sloman <bill.sloman@ieee.org> wrote:
[...]
Any ferromagnetic core material will saturate at a high enough flux -
there's nothing special about a ring core except that you get less
cross-section to saturate for every gram of relatively expensive ferrite >>> that you buy.
...and no air gap.
Commercial ferrites are mostly sold as mating pairs, with optically flat mating faces.
Gapped cores have the inner face ground back to give a stable and
precise gap, and a stable and tolerably precise inductance
https://www.tdk-electronics.tdk.com/inf/80/db/fer/rm_8.pdf
The smallest gap listed is 40 micron.
A ring core isn't significantly different from an ungapped core pair.
In article <ngempi1nktan8bvp4f77j06qu7nudg72v3@4ax.com>,
John Larkin <xx@yy.com> wrote:
Some WWII-vintage infrared sniperscopes used a watch escapement to
briefly close a contact at about 1 Hz, with a D-cell driving a step-up >>transformer and a cold-cathode or selenium retifier.
Infrared WWII. I do not rememver hearing any thing about that.
I heard the stories of 14 year old girl snipers who saw
better in the dark than the 18 year old or older Germans.
Groetjes Albert
I'm sitting on a heap of germanium transistors. From the time that
computers made of discrete germanium transistors were decommissioned.
Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ? (Also trying to use LTSpice for the first time.)
I can measure inductance of coils thanks to the miracle component
testers from China.
In article <414470b6-3a02-4ccc-8854-dc96927fc311n@googlegroups.com>,
Anthony William Sloman <bill.sloman@ieee.org> wrote:
On Monday, January 8, 2024 at 8:05:12 AM UTC+11, Joe Gwinn wrote:
On Sun, 7 Jan 2024 09:42:23 +0000, l...@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
Joe Gwinn <joeg...@comcast.net> wrote:Turns out to be true.
I don't know the origin. Not German. Nor Icelandic (which is
basically Old Norse). But it is true in Norwegian, and Danish.
I had a feeling the O/P was Dutch.
I checked Dutch, which it turns out also spins its cats, and oil is
olie. So it almost parallels Swedish, Norwegian, and Danish. Maybe
the connecting theme is who conquered who over the centuries.
Not in this case. The Dutch republic in its glory days had a large printed industry , which exported to most of northern Europe, in Dutch.
The Dutch language is old. We had to read an 8th century poem
about Charlemagn.(Karel ende Elegast).
On Sat, 06 Jan 2024 14:50:17 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
On a sunny day (Sat, 06 Jan 2024 14:31:49 +0100) it happened >>albert@cherry.(none) (albert) wrote in >><nnd$30302dcf$1e37b7a5@bbcc4a9e0386ea66>:
I'm sitting on a heap of germanium transistors. From the time that >>>computers made of discrete germanium transistors were decommissioned. >>>Also 10 mm and 6 mm ferrite core.
Can I make on oscillator, that runs on 1V , preferably using
coils ?
Yes, Ge transistors start conducting from 150 mV Vbe to maybe 300 mV, so much less than Si .7 V,
Any LC oscillator will work.
Tuned circuit LC in the collector, feedback 1 turn (correct phase) to the base?
Or something like this
https://ecstudiosystems.com/discover/textbooks/basic-electronics/oscillators/images/colpitts-oscillator.jpg
except it needs a power supply.
We were just discussing source-follower Colpitts oscillators yesterday
and concluded that we don't understand them.
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