[sdiy] Log/Lin VCAs/Transconductance amps

[Tony Rolando]

Tom, what is the reason that you will not use the LM13700? It is 
certainly available here in the USA.

Tony

Tom Wiltshire wrote:
> There are a number of VCA chips still in current production and 
> available:
>
> SSM2164 quad vca
> SSM2018 single VCA
> THAT2180/2181 single VCA
> THAT2162 dual VCA
>
> All of these seem to be designed primarily for audio level control, 
> and have a dB/mV control response (log). This contrasts with what I 
> think of as the "previous generation" of chips for VCAs:
>
> CA3280
> LM13700/13600
> CA3080
>
> All of these basic transconductance amps have a linear response. 
> Obviously there were a few SSM/CEM VCA chips around too (CEM 3360 dual 
> VCA for example) but these are in general even more expensive and 
> harder to get than the short list above.
>
> Does anyone know of a cheap/easily available linear VCA or 
> transconductance amp?
>
> Perhaps I'll have to linearize the SSM2164 and use it as a dual linear 
> VCA instead. This provides an upper limit on cost, since the SSM2164 
> is about £4-5.
>
> Thanks,
> Tom
>
>
>
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>