[sdiy] 566 Functional Replacement

[Tim Parkhurst]

Not sure if you'd need a GND pin for reference. Op amps don't, but then
again, they're not charging and discharging caps. Okay, so if we need a
ground pin, I'd say to ditch the Linear CV input.


Tim (or we could make it a 9 pin chip) Servo





On Sat, Mar 17, 2018 at 10:32 PM, Pete Hartman <pete.hartman at gmail.com>
wrote:

> 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
>>>>>
>>>>> _______________________________________________
>>>>> Synth-diy mailing list
>>>>> Synth-diy at synth-diy.org
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>>>>>
>>>>
>>> --
>>> --Tim Ressel
>>> Circuit Abbey
>>> timr at circuitabbey.com
>>>
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>>
>>
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