[sdiy] Synthex Oscillator

[Tom Wiltshire]

On 12 Jul 2017, at 13:10, paula at synth.net wrote:

> 
>> Chamberlin's analog side is a bit
>> weird, using a 2040 as an anti-aliasing filter, and then using a pair
>> of CA3080s as an SVF. That's probably not a design choice we'd make
>> these days!
> 
> Not really.
> For the anti-aliasing filter you want as steep a slope as you can get, with the 2040 you can get a 24dB/Oct slope, a SVF typically has 12dB.
> Also the two sound very different and perhaps he just preferred the sound of the SVF?
> 
> That said, lots of instruments used SSM/CEM chips for anti-aliasing in the 80s, the fairlight being one of the more notable.

Yeah, back in the day. All I meant was now you'd pay a fortune for a SSM2040 (though for how much longer?) and if you did, you might want to do more with it than just use it as an anti-alising filter. Similarly, if you're building an SVF, why use noisy/obsolete CA3080s? At the very least, now you'd use a LM13700.

Tom

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Synth & Stompbox DIY
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