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Article #16250

Re: microphone circuit

#16250
From: Bill Mayhew
Date: Tue, 05 Jan 1993 14:24
19 lines
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The last time I watched a piano tuner in action, he used a strobe
disc to rough in the tuning.  The disc was in in a box with a neon
bulb apparently connected to the output of an amplifier.  The speed
of the disc was also regulated, as the box had a sharp/flat knob,
which the turner adjusted slightly sharp, a qualitative adjustment,
for the paino's upper registers.  He adjusted A 440 with a tuning
fork first, then worked up and down form there.  Final voicing was
done entirely by ear.

Given the the complex waveforms that most insturments genreate, the
stroboscopic disc is a really handy means for checking frequency.
I'd imagine that one could be more hip by replacing the neon bulb
(it was a lot bigger than an NE-2H) with an LED array.


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu (140.220.1.1)    146.580: N8WED
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Path: arc1-ca.pugleaf.net!sparky!uunet!olivea!spool.mu.edu!agate!usenet.ins.cwru.edu!neoucom.edu!wtm
References: <1i9clnINN4kj@cs.tut.fi>

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Path: arc1-ca.pugleaf.net!sparky!uunet!olivea!spool.mu.edu!agate!usenet.ins.cwru.edu!neoucom.edu!wtm
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Newsgroups: sci.electronics
Subject: Re: microphone circuit
Message-ID: <1993Jan05.142425.25633@uhura.neoucom.edu>
Date: 5 Jan 93 14:24:25 GMT
References: <1i9clnINN4kj@cs.tut.fi>
Organization: Northeastern Ohio Universities College of Medicine
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