Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > August 2010 > 2010.08.13 > 09Prev  Next


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


(Message sent Fri 13 Aug 2010, 13:46:44 GMT, from time zone GMT-0400.)

Key Words in Subject:  Frame, is, Motor, PPCo, Roll, Speed, Unstable

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2024 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Please Support Publication of the MMD with your Generous Donation

Pay via PayPal

No PayPal account required

                                     
Translate This Page