[sdiy] 566 Functional Replacement

[Tim Ressel]

When I sed 'VCO' I did not mean a full-featured volt per octave VCO. I 
literally meant an oscillator that has voltage control. Cv in, triangle 
and square out, thats it. thats what the 566 did. that is what I want. 8 
pins, 5 passives, and you're in business. thats what the 566 brought to 
the party.

-t-i-m-b-o-


On 3/19/2018 9:21 AM, Mattias Rickardsson wrote:
> Some thoughts about the dream VCO discussions here:
>
> What would be the main reasons for wanting a tiny VCO IC?
> I can find it hypothetically attractive, sure, but given that it will 
> never have many features AND a small size at the same time, I'd almost 
> always need to add stuff outside in the end since you rarely want just 
> the basic functionality. If I'd use a dedicated VCO IC I'd rather have 
> some features that are sometimes not in use than having to add 
> near-basic functionality with external components. The only true 
> reason for a small chip that I can come to think of is cost. I guess 
> it somehow scales with size in IC fabrication?
>
> Making wishlists with VCO features, ending up on the 3340 
> specification from 38 years back... aren't we missing something? :-)=
> Many modern analog oscillators (both in modulars and in hardwired 
> synths) have other features than the ones we had in the '80s. This 
> should be reflected a bit in the wishlists we make for VCOs today, 
> even if most of these features could be added outside the main chip. 
> Exponential and linear CV should be mandatory, 
> triangle/sawtooth/square outputs as well - and I'm thinking that a 
> triangle core would be the way to go, even if proper sync needs to be 
> dealt with in a less obvious way. That said, we're still stuck in 
> 1980. Sine shaper, thru-zero FM, what more is desired for the 
> synthesists of today? :-)
>
> Btw, Tim P, that negative expo CV allowing a single inverting CV 
> summer is a smart choice. What about the double cap pins in your 
> suggested pinout? Do they give a better solution than the 
> cap-to-ground used in both CEM and SSM ICs?
>
> /mr
>
>
>
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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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