Korg MS 20 f->Volt Converter

[kimmo at ecdl.hut.fi]

On 11 Feb, Paul Perry wrote:
> At 10:38 AM 10/02/99 -0500, Bissell, Harry wrote:
> 
>>one).  If your interested I'll try to find the 360 Systems circuit. I had to
>>trace it out by hand (with all chip numbers dusted off). Maybe some errors
>>but I was able to identify all thr chips from their pinouts (4000 CMOS).
> 
> Would certainly appreciate this, i am looking at f to v schemes to get cv out
> of a theremin design. The MS20 is kinda OK but I think not as
> optimal/elegant as could be.
> I think the 360 system with a slew limiter added (with the slew rate
> controlled by the 
> output CV in some way) might be best.
> 
Well, about two years age I tried some hspice simulations on enhanced
ripple rejection for a  MS20-type f to v conversion. There I used two
cascaded RC-filters with relative small time constants and sampled the
average of each filter nodes. Goes linearly down to 100 Hz with 2.2 ms
time constants in simulations.

I gathered the old data together on my web page so look there what I
actually mean. URL: http://www.ecdl.hut.fi/~kimmo/f2lincv/

Propably not easiest nor the best way to do it, but it still good to
have some strange circuits around when you get bored with "normal
circuits". 

Bets regards,
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   Kimmo Koli                         Helsinki University of Technology 
   kimmo at ecdl.hut.fi                  Electronic Circuit Design Laboratory
   http://www.ecdl.hut.fi/~kimmo      P.O.Box 3000
   Tel:  +358 9 451 2273              FIN-02015 HUT
   Fax:  +358 9 451 2269              Finland 
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