[sdiy] Is this a comparator?

[Dave Magnuson]

Hi Derek,

There are a bunch of Maxim switches (these are the DG switches Tom referred 
to).   Here's a link to their switch page:

http://www.maxim-ic.com/products/switches/index.cfm?CMP=3682

Follow the "mid voltage" link to see a list of options... many have a 36V 
range which works great in our +/-15V environment.     A good thing to note: 
Maxim used to give free samples...  and I still see a "samples" button at 
the bottom of the pages

Dave Magnuson

----- Original Message ----- 
From: "Derek Holzer" <derek at umatic.nl>
To: "Tom Bugs" <admin at bugbrand.co.uk>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, October 31, 2007 9:50 AM
Subject: Re: [sdiy] Is this a comparator?


> 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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