[sdiy] high quality expo VCA

[charlie lamm]

I already have it!  Yes, great book...I will go home and check it
out---many thanks.

On Fri, 22 Nov 2002, Seb Francis wrote:

> Hi Charlie,
>
> The book is "The Art of Electronics" by Horowitz and Hill (second edition) ISBN 0-521-37095-7.
>
> It's quite expensive, but I highly recommend it as a technical (but not *too* mathematical) electronics reference, with plenty of useful stuff for the home synth builder :)
>
> The circuit I mention is on page 212, and is explained on page 213 onwards.
>
> Seb
>
>
> charlie lamm wrote:
>
> > I would like to see this...for something I am building as well....do you
> > have the book title?  Maybe the University library has it.  Thanks in
> > advance....
> >
> > On Fri, 22 Nov 2002, Seb Francis wrote:
> >
> > > Fernando de Izuzquiza wrote:
> > >
> > > > But still looking for a good VCA with expo/lin switchable response...
> > >
> > > > Has anyone designed an expo circuit with the SSM2164? We have Mike Irwin LIN design, and the chip is
> > > > originally expo so... it would be nice to switch between the two responses.
> > >
> > > You could switch in and out a logarithmic amplifier between the CV and the VCA, I think that should allow expo/lin response with a SSM2018/2164/etc.
> > >
> > > I've got a circuit in a book which uses a matched NPN-pair, 2 opamps, 4 resistors, a cap and a diode to do this.  I can describe the circuit in more detail if you want.  I believe you can also get single chips which do this.
> > >
> > > Seb
> > >
> > >
>