microphone circuit

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Article #15969

#15969

From: Scott Baker
Date: Mon, 04 Jan 1993 02:29

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Can someone recomend a minimal part count and minimal power
(battery powered) circuit to amplify a microphone
just enough to trigger a frequency counter (25 mV RMS sine wave
sensitivity, with trigger level variable +-350 mV around the
average value of the input).  The microphone is a Radio Shack
model 33-2001 with 500 Ohm impedance.

I'm want to use a frequency counter as a guitar tuner.

Thanks:
Scott Baker                                   scottb@sail.labs.tek.com
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Path: arc1-ca.pugleaf.net!sparky!uunet!news.tek.com!sail!scottb
From: scottb@sail.LABS.TEK.COM (Scott Baker)
Newsgroups: sci.electronics
Subject: microphone circuit
Keywords: microphone
Message-ID: <13134@sail.LABS.TEK.COM>
Date: 4 Jan 93 02:29:35 GMT
Reply-To: scottb@sail.LABS.TEK.COM
Distribution: na
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 17