[sdiy] good VCA chip?

[Czech Martin]

The sound performance is very good, the application notes circuit
can take signal levels up to 12V or so.
So control signals can be feed in also.
The feedthrough of the control pin to the output
was about 10mV for a full scale control signal (i.e. 0dB to
-100dB). (from my had)  This is not bad. I have no idea
how this will be at temperatures other than 24C.
Perhaps this DC feedthrough can be optimised with some
canceling circuit. I have to review this.

It would be interesting to hear about THAT VCA chips.
I guess they have a similar DC feedthrough wich does
not really harm in the usual application circuits
(mixing consoles or AGC circuits).

I plan to use this chip as VCA. It's ok for me.
Since this chip is available (Farnell sell them worldwide),
I've bougth a dozend of them, just in case AD will drop them.
I fear this will happen sooner or later.


m.c.

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of john mahoney
> Sent: Dienstag, 16. September 2003 23:33
> To: synth diy
> Subject: [sdiy] good VCA chip?
> 
> 
> Would this chip make a good synth VCA?
> 
> http://www.analog.com/Analog_Root/productPage/productHome/0,21
> 21,SSM2018,00.html
> 
> The audio specs look good -- very quiet, low distortion -- 
> but I don't know
> the specs needed for a VCA. (And I think it depends on 
> whether or not you
> want to run CVs through it...)
> --
> john
> 
>