vca: no CEM, no SSM (was: ssm-2040)

[Ian Fritz]

This sounds the same as the circuit in the National Semiconductor
Application Note 299. (The op amps are LF412 there). You can get this
app. note off the National Web site.

  Ian


Paul Perry wrote:
> 
> At 01:36 PM 11/08/98 -0400, Andrew Schrock  wrote:
> >I know this has been tossed around before, but has anybody come up with a
> >good non-CEM, non-SSM VCA solution?
> 
> Jim Williams published one in EDN using 3 LF421 op amps and a LM394 matched
> pair and a 2n2222. The hard part is bleedthrough, in his there isn't much,
> even with 10v pp input. There is a separate "cancellation" part of the ckt