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

[thx1138]

On 6/6/09 4:44 PM, "Dan Snazelle" <subjectivity at hotmail.com> wrote:

> 
> 
> patent number is on the datasheet.
> 
> its a good read
> 
> 
> 
> ----------------------------------------
>> From: gsn10 at hotmail.com
>> CC: synth-diy at dropmix.xs4all.nl
>> Subject: RE: Emu SSMs (was Re: [sdiy] A potential problem with a
>> voice-assignable organ)
>> Date: Sat, 6 Jun 2009 17:58:48 -0400
>> 
>> 
>>> 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.
>> 
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I have the schematics for the Moog Modular products and Bode Products that
could be scanned as well.

The E-Mu Modular used a SSM2040 in later designs. The earlier designs are
very similar to the SSM2044.

Regards,

Terry