[sdiy] TDA7052A as VCA

Ian Fritz ijfritz at comcast.net
Wed Jun 30 02:43:11 CEST 2010


At 06:23 PM 6/29/2010, David G. Dixon wrote:
> > > > Wouldn't the 18V PS max be a hinderance in many cases?
> > >
> > >I don't see why.  I'd just power it off the positive rail.
> >
> > Not following you. AC couple all signals?
> >
> > Remember, if your VCO pulse output is +/- 5V and you AC couple a narrow
> > pulse, the the signal is nearly 0V to 10V.
>
>To use this thing in a synth, all CV signals would have to be lifted into
>positive territory and attenuated.  The useful range of CV is only about 1V
>peak-to-peak, centred on +0.9V.

That part doesn't sound too bad.


>(Am I understanding your concern?)

I'm concerned with the signal input level.  Looks like you have to 
attenuate/shift/process/unshift/amplify, no?


>Also, this chip is designed as a DC volume control, so there is no mention
>of anything like a slew rate.  It might not respond terribly well to audio
>range modulation (?).

And what about CV feedthrough?


   Ian 




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