[sdiy] SSM2164 base for Doepfer sdiy synth kit.

[Guy Drieghe D.]

On 14 Aug 2010, at 00:50, karl dalen wrote:

> One more 2164 app.
> 
> 1:Doepfer diy synth kit are apparently based on the SSM2164.(One side Expo other SVF).

Yes.

> 2:According to Doepfer a oven heats up the 2164.

It's an option, yes.

> 3:As seen in the block diagram the VCO core have Lin FM Sync,Saw, PWM.
> 4:That suggest he uses a traditional Saw (we can see a BF245)core with
> the expanded Roman Sowa expo(expanded by D Dixon/Huoysama and Co.)
> 5:But since expo already temp compensated why go the extra mile to heat it.
> 6:The picture of the PCB shows us the oven either piggybacked over the 2164 or replaced by a SO 2164 who plugs into the DIP 2164 socket.

It's piggybacked and glued to the 2164. I don't know what the upside-down chip is.

> 7:In either case there must be plenty of package mass to create gradients between the oven and the actual 2164 who makes heating slow.
> 8:Doepfer verifies that with a heat up period of 20minutes.
> 9:Doepfer says temp sensor are set just above room temp?!

> 10:The VCA seams to be a CA3080.

There's no 3080 on board.
3 x TL084, 1x TL074, 1x TL082 (on the oven), and 1x 555

_g

> 
> One idea i got was to to use a small heating filament under the DIP2164.
> 
> Cheers
> KD
> 
> 
> 
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