Re: microphone circuit

Article View: sci.electronics

Article #15975

#15975

From: Adam Trent Phillips
Date: Mon, 04 Jan 1993 05:17

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In a previous article, scottb@sail.LABS.TEK.COM (Scott Baker) says:

>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
>
>

	I figure an op amp should do the trick just fine. There is also an
audio chip (I'll try to look it up) that will work off of a 9v, make it
EASY for the feq. counter to detect the signal AND double as a headphone
guitar amp.

	I also have two of these headphone guitar amps. I could take a look
at the ckt. and tell you what it is...only a few parts and runs pretty long 
off a 9v.
-- 
A. TRENT PHILLIPS |" A mirror is a negative space with a frame and a place for
  also known as   | your face, it reveals what the rest of us see. It conceals
   WHITE  ROOK    | what you'd like you to be."--Blue Oyster Cult
-------bb099@cleveland.freenet.edu-----aa1439@freenet.lorain.oberlin.edu-------

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Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!usenet.ins.cwru.edu!cleveland.Freenet.Edu!bb099
From: bb099@cleveland.Freenet.Edu (Adam Trent Phillips)
Newsgroups: sci.electronics
Subject: Re: microphone circuit
Date: 4 Jan 1993 05:17:32 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Lines: 30
Message-ID: <1i8h9dINN5ds@usenet.INS.CWRU.Edu>
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Reply-To: bb099@cleveland.Freenet.Edu (Adam Trent Phillips)
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