Signal Presence Detectors?

[Hairy Harry]

I've found that even a few OHMS is enough to decouple capacitive
loads... I often use values of 10-100 ohms.

H^) harry


>From: "danial stocks" <diode at hotmail.com>
>To: synth-diy at node12b53.a2000.nl
>Subject: RE: Signal Presence Detectors?
>Date: Tue, 28 Nov 2000 15:32:57
>
>
>
>
>>
>>(2) If you don't want to do (1), at least don't pollute the signal GND.
>>      If you don't want an extra GND, derive it from the +/- supply rails.
>>      A slow Opamp unity gain follower with input at signal GND, and
>>      its output serving as Dirty_GND will often do. Do not bypass the
>>      opamp output to signal GND with a cap, though. If you need
>>      a cap, it goes to +Vb or -Vb.
>>
>dont bybass the op amp o/p with a cap to anywhere.. you'll regret it! they
>dont like cpacitive loads at all! any big cap >afew nf to anything other
>than a high impedance point ie audio o/p, summing node, next op amp stage
>etc really needs a few K res between the op amp and the cap..
>Cheers,
>Dan
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