Ideas for a new circuit

[David MOYLAN]

How about this:  level shift the input by -2V.  Full wave rectify.
That gives you 0V at 2V in and 1V for both 1V (shifted to -1V) and
3V (shifted to 1V).  (could also rectify in the opposite direction
to give -1V)  Invert to -1V.  Scale by 5.  Level shift by 5V.  Done

Seems like it could all be done with one quad op-amp.

dave moylan


On Fri, 22 May 1998 jorgen.bergfors at idg.se wrote:

> Hi synthesists.
> 
> In an idea for a new synth module, I need a circuit that peaks at a certain 
> input voltage and then reduces it's output for higher and lower voltages.
> The output shold be a voltage, say 5 volts, at 2 volts and then gradually 
> decrease in amplitude to 0 volts when the input reaches 1 and 3 volts. Above 
> and below that, it should have no output. 
> It should be fast enough to follow audio input signals.
> Any circuit ideas?
> 
> /Jorgen
> 
>