Cgs synth

Hi Ken

Thanks for the prompt reply,

one or two points that I'm a bit vague on still, perhaps you can confirm I understand your comments correct.

>Simply a case of swapping the outer wires. It was not a true bandwidth function, instead just labelled so due to the apparent change of bandwidth when adjusting the resonance.

ok, but if I...

>put a single gang pot in series with one of the 100k stages (one will be backwards from what you want), or use two separate 100k pots instead.

this'll give a 'true' bandwidth function ?

and to clarify...

>put a single gang pot in series with one of the 100k stages

between pin7, from the 1st opamp, and the 100K, or the other side (does it matter)?

and this'd be either that / or, one between the 680R and the 100K, or on the other side (node from pin7 of the 2nd amp)?

>(one will be backwards from what you want),

not quite sure what you mean here

>or use two separate 100k pots instead.

instead of the dual gang on the cct ?

>>worth going the extra mile to track down these elusive pots?
>not in my oppinion, no.

that's good enough for me, phew : )

>The latter would be more versatile, but if you don't mind the cost of doing a dedicated mixer for the filters, it would be easier to use.

cost's not a problem (yet) and I might order another dc mixer board still

>Wire the pots as per the DC mixer diagram.

out of the filter via 50K pot and 47K onto B (below),



or just use one of the input pads on the mixer with a pot right?

>>benefit in using neg log pots
>regular log would be more appropriate.

ideal.


Well, thanks again for the input (no pun intneded), really very helpfull.

Cheers

Al



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