[sdiy] Is this a comparator?

[Andy Wilson]

How about Ken Stone's Analog Logic circuit

http://www.cgs.synth.net/modules/cgs26_analogic.html

Cheers

Andy

On 31 Oct 2007 at 14:50, Derek Holzer wrote:

> Heya Tom,
> 
> Ok, thought maybe a two-step process. Signal would be audio or
> control, 
> in this particular (primitive) system, they are both considered
> equal. 
> If it's choppy, that's just fine, clicks-and-cuts are part of the
> app. 
> Can you be a bit more specific about the audio switch?
> 
> d.
> 
> ps... new AudioWeevil07 looking sharp! They all sold yet?
> 
> Tom Bugs wrote:
> > Hiya D
> > 
> > Yeah, you want a comparator first and then use the output
> squarewave of 
> > the comparator to open/close an audio switch (4000 series or DG
> one for 
> > decent bipolar).
> > Depending on the app you may need some hysteresis or smoothing on
> the 
> > comparator -- are you treating audio or control signals?
> > 
> > Rocking'n'best,
> > Tom
> > 
> > Derek Holzer wrote:
> >> There's a function I want to implement, but I don't know what to
> call 
> >> it so I can't start researching the right circuit.
> >>
> >> I'd like to compare an incoming voltage with a reference voltage,
> and 
> >> only allow the incoming voltage to pass if it's above the
> reference 
> >> voltage. I do not want to square the signal, I want to pass it 
> >> unaltered so long as it's above the threshold of the reference 
> >> voltage. When the incoming voltage is less than the reference,
> then 
> >> the reference voltage would be passed (or none at all).
> >>
> >> What is this function called? A comparator? A gate? It's not a
> logic 
> >> function, since it doesn't deal with square waves. I imagine it's
> a 
> >> simple op-amp trick...
> >>
> >> thx + best,
> >> d.
> > 
> > 
> 
> -- 
> derek holzer ::: http://www.umatic.nl :::
> http://blog.myspace.com/macumbista
> ---Oblique Strategy # 19:
> "Be dirty"
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---

Andy Wilson
http://www.techman.synth.net
techman at synth.net