• Re: LM566 alternative.

    From Paul Badenhorst@21:1/5 to Kevin Glover on Wed Jul 27 22:39:18 2022
    On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:
    I have benn trying to find a decent alternative to the LM566 VCO. It
    does not seem to be sold anymore at reputable sellers and the ones on
    EBay (from China) I don't trust to be authentic or unrecycled. Does
    anyone know of a 8 to 16 pin alternative (just square and triangle
    out) that won't break the bank.
    Thanks
    -Slackmeister

    I have just seen your message. just thinking. Would it not be possible to use a LM565 's VCO. Would have to design a small board to fit the LM566 socket. If you could find them? also discontinued.

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  • From Paul Badenhorst@21:1/5 to Kevin Glover on Wed Jul 27 23:27:48 2022
    On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:
    I have benn trying to find a decent alternative to the LM566 VCO. It
    does not seem to be sold anymore at reputable sellers and the ones on
    EBay (from China) I don't trust to be authentic or unrecycled. Does
    anyone know of a 8 to 16 pin alternative (just square and triangle
    out) that won't break the bank.
    Thanks
    -Slackmeister
    I see i have two unused NE566E's.

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  • From legg@21:1/5 to paulbpb@gmail.com on Thu Jul 28 09:27:58 2022
    On Wed, 27 Jul 2022 23:27:48 -0700 (PDT), Paul Badenhorst
    <paulbpb@gmail.com> wrote:

    On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:
    I have benn trying to find a decent alternative to the LM566 VCO. It
    does not seem to be sold anymore at reputable sellers and the ones on
    EBay (from China) I don't trust to be authentic or unrecycled. Does
    anyone know of a 8 to 16 pin alternative (just square and triangle
    out) that won't break the bank.
    Thanks
    -Slackmeister
    I see i have two unused NE566E's.

    Now all you need is a time machine to transport them back
    to 2016.

    RL

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  • From Phil Hobbs@21:1/5 to Paul Badenhorst on Thu Jul 28 10:43:04 2022
    Paul Badenhorst wrote:
    On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:
    I have benn trying to find a decent alternative to the LM566 VCO. It
    does not seem to be sold anymore at reputable sellers and the ones on
    EBay (from China) I don't trust to be authentic or unrecycled. Does
    anyone know of a 8 to 16 pin alternative (just square and triangle
    out) that won't break the bank.
    Thanks
    -Slackmeister
    I see i have two unused NE566E's.


    Re: Google Groups

    Welcome to Usenet (not Google Groups). This group is
    sci.electronics.design, which is actually older than Google.

    It's entirely unmoderated and unrestricted, except for the generally
    accepted informal rules, known as *netiquette*.

    Don't let Rob discourage you--c'mon and join the fun.

    Re: NE566

    The 566 is a really crappy oscillator. It's perfectly okay for a
    junkbox project, of course--I've done lots worse things myself--but for
    a real design there are many, much better choices nowadays.

    On the simple end, the oscillator of a CD4046 will work as a very
    wide-range VCO with a pretty linear tuning characteristic over about
    100:1 in frequency, though the center frequency isn't that accurately controlled by the RC time constant.

    The 4046 has only a square-wave output, so if that's a worry one could
    use one of many dual op amps. One section would be a Howland current
    source driving an integration capacitor with its other end grounded, and
    the other would be a Schmitt trigger controlling the polarity of the
    Howland. That will be better than the 556, but of course needs a lot of
    extra resistors. (On a PC board, one could make both the Howland and
    the Schmitt using one 8x resistor array, so it wouldn't be that many
    parts in real life.)

    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 Don Y@21:1/5 to legg on Sun Jul 31 03:51:38 2022
    On 7/28/2022 6:27 AM, legg wrote:
    On Wed, 27 Jul 2022 23:27:48 -0700 (PDT), Paul Badenhorst
    <paulbpb@gmail.com> wrote:

    On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:
    I have benn trying to find a decent alternative to the LM566 VCO. It
    does not seem to be sold anymore at reputable sellers and the ones on
    EBay (from China) I don't trust to be authentic or unrecycled. Does
    anyone know of a 8 to 16 pin alternative (just square and triangle
    out) that won't break the bank.
    Thanks
    -Slackmeister
    I see i have two unused NE566E's.

    Now all you need is a time machine to transport them back
    to 2016.

    No, they're likely already there! The issue is getting the INFORMATION regarding their availability to the OP!

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  • From Anthony William Sloman@21:1/5 to Phil Hobbs on Sun Jul 31 06:58:26 2022
    On Friday, July 29, 2022 at 12:43:13 AM UTC+10, Phil Hobbs wrote:
    Paul Badenhorst wrote:
    On Friday, 19 August 2016 at 04:38:37 UTC+2, Kevin Glover wrote:

    Re: NE566

    The 566 is a really crappy oscillator. It's perfectly okay for a
    junkbox project, of course--I've done lots worse things myself--but for
    a real design there are many, much better choices nowadays.

    On the simple end, the oscillator of a CD4046 will work as a very
    wide-range VCO with a pretty linear tuning characteristic over about
    100:1 in frequency, though the center frequency isn't that accurately controlled by the RC time constant.

    The 4046 has only a square-wave output, so if that's a worry one could
    use one of many dual op amps. One section would be a Howland current
    source driving an integration capacitor with its other end grounded, and
    the other would be a Schmitt trigger controlling the polarity of the Howland. That will be better than the 556, but of course needs a lot of extra resistors. (On a PC board, one could make both the Howland and
    the Schmitt using one 8x resistor array, so it wouldn't be that many
    parts in real life.)

    Another option is to run the 4046 eight or 16 times faster than the sine wave frequency you need, divided it down by eight or sixteen, to get a square wave of the desired frequency, and clock the slower square wave through an eight or sixteen stage
    shift register at the faster clock rate.

    By tacking the right resistor values onto the taps on the shift register , and running all the resistors into a summing junction you can make finite impulse response low pass filter and get a pretty clean sine wave over quite a wide range of frequencies,
    You use up a lot of E96 value O.1% resistors, and you have to worry about putting a Hamming window on your sinc function resistor vales to suppress Gibbs oscillations, but it can make a nice sine wave over a wide range of frequencies.

    --
    Bill Sloman, Sydney

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