Modular Synth Panels

OK, we're biting <G> - where do we learn about these passive circuits?
 Bill and Will



--- In ModularSynthPanels@yahoogroups.com, Mark <yahoogroups@...> wrote:
>
> 
> While that might be fun, and possibly educational, being able to
> switch between linear and a log response isn't all that practical.
> While most audio level controls have a log response, it isn't
> necessary.  I've mixed and attenuated audio signals with my Oakley
> Multimix, CGS Tube VCA, and other gizmos with linear knobs without
> any problems.
> 
> However, what might be more fun for Will is seeing how many synth
> functions he can accomplish without using any power.  All sorts of
> waveshapers, filters, rectifiers, pulse stretchers, logic functions,
> etc., even an approximation of an attenuator that switches between
> linear/log, can be built using only passive components, if one were
> so inclined.
> 
> On 1/30/09, wjhall11 put forth:
> >Will just pointed out that if we use 100K lin pots for such a gadget,
> >we could have a switch to send the signal through a couple op-amps
> >with resistors to make the pot act like a log pot... so we could
> >switch each pot between lin (truly passive) and log (via op amps and
> >resistors set to unity gain).  He's thinking Tellun MUUB4.  Kind of a
> >cool idea.  I'll ask him to explore the little circuit design.  So
> >this would be an added benefit of building it into a 1U panel... that
> >it could have this active component just for fun.  Bill and Will
>