[sdiy] 566 Functional Replacement

[Pete Hartman]

I'd ditch the square wave and use wave shaping for everything beyond the
triangle....

On Sun, Mar 18, 2018 at 1:19 AM, Tim Parkhurst <tim.parkhurst at gmail.com>
wrote:

> 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
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>
>>>> --
>>>> --Tim Ressel
>>>> Circuit Abbey
>>>> timr at circuitabbey.com
>>>>
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>>>
>>>
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>>
>
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