[sdiy] Is this a comparator?

[Derek Holzer]

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
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