[sdiy] Korg MS-50 VCA and VCF

[Stewart Pye]

What a strange coincidence. Just in the last week I had the idea of 
building a filter based on the one in the Minikorg. My plan is to use 
the op amp control circuit as in the MS50, but the transistor output 
amps as in the Minikorg. I've simulated some of the Minikorg circuit and 
the output amp seems to be great for soft clipping. My next decision was 
whether to use hand matched diodes or transistor arrays for the bridge 
diodes. I see Tony has used THAT300 transistor arrays...

As for the reason behind it, I own a Minikorg 700s, and the filters 
sound cool. I'm not sure why you'd bother with the VCA.


Info on the Minikorg VCF can be found here:
http://www.colinfraser.com/m700/index.htm

Cheers,
Stew.


Oakley Sound wrote:
> > why go with diode bridges???
>
> Korg had diode rings in some of their earlier stuff. 700, 700S and 770 
> all feature diode bridges.
>
> They sound rather good and different in tone to both the Korg35 and 
> OTA Sallen and Keys.
>
> My take on the diode ring is here:
>
> http://www.oakleysound.com/journey.htm
>
> Tony
>
> www.oakleysound.com
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