[sdiy] Bipolar comparator

[Ullrich Peter]

Exactly! And there hav been special circuits for it like the TCA965 and some appnotes - like this one
http://www.ti.com/lit/ug/tidub01/tidub01.pdf

Ciao
Peter

-----Ursprüngliche Nachricht-----
Von: O Gillet [mailto:ol.gillet at gmail.com] 
Gesendet: Montag, 30. Juli 2018 11:53
An: Ullrich Peter <Peter.Ullrich at kapsch.net>
Cc: Rutger Vlek <rutgervlek at gmail.com>; *SYNTH DIY <synth-diy at synth-diy.org>
Betreff: Re: [sdiy] Bipolar comparator

This is called a "window comparator" or "window detector".
On Mon, Jul 30, 2018 at 11:51 AM Ullrich Peter <Peter.Ullrich at kapsch.net> wrote:
>
> You could use two comparators with open collector output. One works with the positive comparator level, the other with the negative one.
> The output of the comparator are switched together and work with a single pullup resistor.
>
> Ciao
> Peter
>
> -----Ursprüngliche Nachricht-----
> Von: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] Im Auftrag von Rutger Vlek
> Gesendet: Montag, 30. Juli 2018 10:57
> An: Synth DIY <synth-diy at synth-diy.org>
> Betreff: [sdiy] Bipolar comparator
>
> Hi guys,
>
> I've just invented the word in the subject for this message, but I hope something like it exists. I'm in search of a simple circuit that can perform comparator duties on bipolar signals, and provides a high output when the signal goes above an adjustable threshold level or below the same level negatively. So with a 10Vpp bipolar signal and a threshold setting of 2.5V I'm hoping the output to become high when the signal goes over 2.5V and under -2.5V.
>
> I discovered it can be done with a full-wave rectifier in front of a normal comparator, but perhaps there are more economic solutions? Do you know of any? I've been looking into simple noise-gate circuits as well, for inspiration, but without success so far.
>
> Rutger
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