[sdiy] 566 Functional Replacement

[Tim Parkhurst]

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
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at synth-diy.org
>>> http://synth-diy.org/mailman/listinfo/synth-diy
>>>
>>
> --
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
>
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