[sdiy] Multiplier vs VCA?

[jays at aracnet.com]

Mike and all,

Since these (218X) are single VCAs with temp coeffients would having them in seperate packages be an issue?

Also now we're up to 2 - 218Xs for a linear VCA and at $4 a pop that's $8 per linear VCA. That is getting pretty pricy.

Jay S.

Mirwin at qouest.net wrote :

> Hello List,
> It is possible to "bend" the control response of the dB/V VCA chips
> to 
> implement linear response VCA's... for a simple method to turn a single 
> Analog Devices SSM2164  VCA chip into a Dual High Quality Linear VCA, 
> see the following article (be careful with the word-wrap when clicking 
> on the URL):
> 
> http://www.reed-electronics.com/ednmag/index.asp?layout=article&articleid=CA233728
> 
> Anyone know if this circuit technique is being used in any currently 
> available synthesizer modules? (it is being used by Modcan)
> Regards, Mike