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From: sundar@mit-hermes.ARPA ((Hand Hacker))
Newsgroups: net.audio
Subject: tuning equipment..
Message-ID: <2437@mit-hermes.ARPA>
Date: Wed, 24-Jul-85 03:45:42 EDT
Article-I.D.: mit-herm.2437
Posted: Wed Jul 24 03:45:42 1985
Date-Received: Fri, 26-Jul-85 03:17:17 EDT
Distribution: net
Organization: The MIT AI Lab, Cambridge, MA
Lines: 15

I dont know if this is appropriate for this newsgroup, but I could use
some audio expertise... so here goes:
I was wondering if any electronic tuners exist.i.e. a box which you
could place before ANY instrument - twiddle knobs to indicate the note
and the octave (and maybe instrument?) and then play that particular
note on the instrument. The box would then indicate (of course) if the
played note was  higher or lower than the correct frequency.
If such tuners exist, who makes them? and how do they operate? (note
that I am really looking for something that can tune a wide range of
instruments).
If such a general tuner doesnt exist, how does one go about (at least
for starters) building one for say, a stringed instrument? 
Any help/suggestions would be appreciated.
Thanks in advance for your time.
-sundar.