[sdiy] LM13700 crossfade query

Tom Bugs admin at bugbrand.co.uk
Wed Jun 15 14:54:30 CEST 2011

Great - thanks - and for the tip on keeping traces short - I would do 
anyways, but good to point it out.

I had a look at ESQ1 schematics and while they don't have LM13700s, they 
do do the summing of the CEM3379 outputs in this manner.

Cheers, Tom

On 15/06/2011 13:21, Olivier Gillet wrote:
> Looks good to me. You can find a similar topology in some polysynths,
> where each voice's VCA current output - just like the LM13700 outputs
> - are fed straight into an op-amp in "transimpedance" configuration (I
> think I've seen that on the ESQ-1).
> As it has been discussed a few times here, you should keep the 2
> traces from the LM13700 outputs to the op-amp as short as possible.
> Olivier
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