If your any good at breadboarding electronic circuits, try this one. It's much better and the fan will run better too.

http://www.uoguelph.ca/~antoon/circ/pwm555.html

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.