[sebhc] Motor control

[Lee Hart]

Carroll Waddell wrote:
> Does anyone know how a diskette motor speed control works? It
> appears to have some kind of feed back tach in the motor to
> indicate the motor speed. I'm working on a Siemens drive motor
> control card.

Heath provided a manual for the Siemens FDD-100 drive which includes a
schematic. I've got one around here somewhere. As I recall, it is an
analog circuit that senses speed with a tachometer built into the motor.
A pot sets the speed. I'll try to find it and take a look at the
circuit.
-- 
Ring the bells that you can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in
	-- Leonard Cohen
--
Lee A. Hart   814 8th Ave N   Sartell MN 56377  
leeahart_ at _earthlink.net


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