PPCo Roll Frame Motor Speed is Unstable
By John A. Tuttle
Hi All, Craig Brougher brought to my attention the fact that the
original roll frame speed control design called for a wirewound
potentiometer. PPCo later opted to use a cheap carbon pot. Craig
also noted that the only reason the speed control worked with the
cheaper pot is that it's in parallel with a 6 ampere diode, which
he suggested should also be replaced with two similar diodes, just
to be safe.
Musically,
John A Tuttle
Player-Care.com
Brick, New Jersey, USA
[ A suitable 5-watt wirewound potentiometer, 500 or 1000 ohms, is
[ available at http://www.mainelectronics.com/potentiometers.htm
[ part no. 26TBL500 or 26TBL1K. -- Robbie
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(Message sent Fri, 13 Aug 2010 09:46:44 -0400
, from time zone -0400.)
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