Emu SSMs (was Re: [sdiy] A potential problem with a voice-assignable organ)

[Dave Manley]

Scott Nordlund wrote:
>> If you want to understand the 2044, then look at the Moog filter transistor
>> Ladder. It was very similar, but yet a bit different in approach.
>>     
>
> I had suspected as much due to the way the capacitors are connected.  Any more details?
>
>   
>> The Patents on the SSM2044 probably ran out quite a while back and it could
>> be nice to re-build this chip with a few improvements on Thermal stability
>> For tracking a CV in oscillation mode when the Q is turned up.
>>     
>
> Got any specific patent numbers?  I'd be interested in reading them.
>
>   
ssm2040 pat# 3969682 1976
ssm2044 pat# 4404529 1983

-Dave