[sdiy] 566 Functional Replacement

Pete Hartman pete.hartman at gmail.com
Sun Mar 18 06:32:31 CET 2018


Wouldn't you need a ground pin for reference?

On Sat, Mar 17, 2018 at 10:07 PM, Tim Parkhurst <tim.parkhurst at gmail.com>
wrote:

> What the world really needs is a minimalist 8-pin chip VCO (DIP and SOIC
> flavors, please). 7 or better octaves of 1v/o tracking (externally trimmed
> CV) would be a huge plus. In case any chip makers or millionaires are
> listening, I'd make the pins:
>
> +V (9 to 12V)
> -V (9 to 12V)
> Expo CV In (0 to -V so that you can use a single op amp as an inverting CV
> summer, temp compensation built into the on-chip expo)
> Linear CV In
> Cap pin 1
> Cap pin 2
> Tri out (+/-5V with +/-12V supplies)
> Square Out (+/-5V)
>
> Things like Sync, PWM, Saw out, Sine out could easily be done with
> external op amps, but only if needed. Maybe make a second version with Saw
> instead of Tri.
>
>
> Tim (All you need is cash) Servo
>
>
>
>
> On Sat, Mar 17, 2018 at 1:25 PM, Tim Ressel <timr at circuitabbey.com> wrote:
>
>> I hear ya, guess I miss having a tiny solution.
>>
>> --tr
>>
>>
>>
>> On 3/17/2018 12:00 PM, Dan Snazelle wrote:
>>
>>> Honestly now that the Cem vco  is back in production , in prices lower
>>> than the 566 (especially in quantity ) I would think that chip would be a
>>> better bet.
>>>
>>> You basically want an OSC on a chip that has multiple waveforms right ?
>>>
>>> Sent from my iPhone
>>>
>>> On Mar 17, 2018, at 1:27 PM, Tim Ressel <timr at circuitabbey.com> wrote:
>>>>
>>>> Hi,
>>>>
>>>> A while ago I asked for circuit ideas to use my rare 566s in. The more
>>>> I got into the suggestions the more I realized just how useful the 566 was.
>>>> And the more sad I got that its gone.
>>>>
>>>> I am looking for a functional replacement for what the 566 used to do
>>>> for us. A small, low part count vco design that covers more or less what
>>>> the 566 did. I would prefer analog over digital because some uses, like
>>>> noise modulation, may not work so well with a digital solution.
>>>>
>>>> I have looked at the 4046 design but it requires some components,
>>>> especially if you want triangle output. There was a tri-core design I saw
>>>> somewhere online that was real tight. I think it was a 13700 based circuit.
>>>> But I can't find it now. The is the KA331 but it is DIP only.
>>>>
>>>> Hmm .. maybe I am out of luck.
>>>>
>>>> --
>>>> --Tim Ressel
>>>> Circuit Abbey
>>>> timr at circuitabbey.com
>>>>
>>>> _______________________________________________
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>>>>
>>>
>> --
>> --Tim Ressel
>> Circuit Abbey
>> timr at circuitabbey.com
>>
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>
>
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