Small DC motor speed control

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Article #22471

#22471

From: Keith MaloneyHuss
Date: Wed, 28 Feb 1990 18:10

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I use a small Sony microcassete recorder that has two tape speeds,
1.2 and 2.4 cm/sec.  As I use this only for voice recording, and 
"High fidelity" is not required, I was wondering if I could somehow
slow the tape speed to 0.6 cm/sec.  The recorder is powered by 3VDC
(two AA batteries).  Obviously, the electronics (amp, etc) need to 
keep getting 3V, but how is the motor speed reduced?  Is it a simple
voltage cut?  I don't care about wow and flutter as long as I can 
understand what is recorded.  Right now, at 1.2 cm/sec the sound
quality is excellent, and I'd like to be able double my recording
time if possible.
Any ideas on how to slow the tape speed to 0.6 (or 0.3?) cm/sec?

Thanks.
--keith

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!umn-d-ub!cs.umn.edu!ux.acs!keith
From: keith@ux.acs.umn.edu (Keith MaloneyHuss)
Newsgroups: sci.electronics
Subject: Small DC motor speed control
Message-ID: <1238@ux.acs.umn.edu>
Date: 28 Feb 90 18:10:48 GMT
Reply-To: keith@ux.acs.umn.edu (Keith MaloneyHuss)
Distribution: usa
Organization: University of Minnesota, Academic Computing Services
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