[sdiy] Korg 35 chip

[Stewart Pye]

Hi David,

For the OTA type MS20 filter, how would you get around the 2164 "output 
should go to a virtual earth point" issue?

Regards,
Stewart.


David G. Dixon wrote:
>> It's the world's dirtiest Sallen & Key low pass filter design - I can't
>> believe how noisy the filter resonance gets on this thing.
>>
>> I had the opportunity to play with a later OTA-based MS-20 today - the
>> gulf between the two filter designs is enormous!
>>     
>
> Which one do you prefer?
>
> Now that I've finished my 2164 4P LPF (panelizing it tonight!), I'm thinking
> that my next project will be a clone of the later MS-20 HP-LP filter, only
> with 2164 VCAs (and, thus, no expo converter) instead of OTAs.
>
> I might do something with the older MS-20 filter, but I haven't decided.
>
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