Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uunet!tut.cis.ohio-state.edu!rutgers!umn-d-ub!cs.umn.edu!ux.acs!keith
From: keith@ux.acs.umn.edu (Keith MaloneyHuss)
Newsgroups: sci.electronics
Subject: electric motor speed control (in tape recorder)
Message-ID: <1115@ux.acs.umn.edu>
Date: 12 Feb 90 04:17:01 GMT
Reply-To: keith@ux.acs.umn.edu (Keith MaloneyHuss)
Distribution: usa
Organization: University of Minnesota, Academic Computing Services
Lines: 13

I have a tiny, hand-held Sony microcassette recorder that has the option
of two tape speeds: 1.2 cm/sec and 2.4 cm.sec.  The sound quality is very
good even on the slower speed, and as I use it for voice recording only,
I would like to be able to slow down the mechanism to say, 0.6 cm/sec?
or some slower speed in order to get a longer recording time per cassette.
Is this possible?  It runs on 3 VDC.  I was wondering how the motor speed
is halved.  Is it a simple supply voltage cut?  Obviously the electronics
still needs 3 VDC, but could I cut in half the motor supply voltage and
double my recording time?  I don't care about wow and flutter.
All it needs to be is understandable, not "hi-fi".
Any insights on this would be appreciated.
Thanks.
--keith