[sdiy] CMOS Switch as VCA?

[dan snazelle]

i had pretty bad luck with the 4066 as a vca...i was trying to use it as a cheap tremolo though...you might have better results


thanks!



On Feb 8, 2010, at 2:12 PM, <jays at aracnet.com> wrote:

> Might check out the CD4007 too. It's been used in a number of applications like VCA and amps.
> 
> Jay S.
> 
> Scott Nordlund wrote:
> 
>> 
>> Forgive the dumbness of the question, but has anyone tried using a standard CMOS switch (4016/4066) as a "sort of" VCA?  I mean with an actual linear CV input, not using PWM.  I haven't tried it and I've never seen any reference to it, but I can picture it almost working, though probably not in an optimal kind of way.  At least it wouldn't have the CV feedthrough problems of a single transistor VCA....
>> 
>> Any ideas?
>> 
>> I've also seen a completely bizarre 4049/4069 hex-VCA that uses the power pins as the output, but this has the obvious disadvantage that all the signals are mixed together.
>> 
>> I can see potential for this sort of thing in a touch pad based mixer that uses static charges on the CMOS gates to control the signals.  I once accidentally did this with a CMOS display driver that didn't have any pull-up resistors and felt kind of inspired.  It seems like an interesting alternative to the "use your fingers as mixing resistors" touch pad thing, though obviously there would have to be some ESD safeguards...
>> 		 	   		  
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