I am working (?) on the design of a Variable DC Pulsed HO train power controller with adjustable PW frequency, and Pulse width, Amplitude controls. Any suggestions and Snarky remarks appreciated. (BSEE, 1974, Retired, now an HO Steamer !).
[#welcome] to the Forum. Your posts get delayed in moderation for a bit. If you can only manage 5 posts in 10 years, it will be longer than a bit. [:D]
I am no longer a DC guy, but keep your eye out for Atlantic Central -Sheldon
Our sadly, now deceased, electronics expert, Randy Rinker often referenced the Paisley circuits.
Here’s a start:
http://www.circuitous.ca/Throttles.html
Good Luck, Ed
???
a constant frequency PWM throttle are very common. i built a very simple one using an LM324 and mosfet driver with a reversing switch
many DCC decoders use PIC processors that have PWM outputs driving an h-bridge allowing electronic reversing
while i was told that PWM at low frequencies can be harmful to motors, higher frequencies, 200 kHz is fine. variable amplitude is more difficult. a variable DC output with a pulse to overcome stiction as done in the TAT-IV isn’t common
you might consider using a relatively small arduino nano or micro with it’s PWM output as well as other features to drive a mosfet. it could be controlled by either reading a pot or use buttons to control the speed
Every once in a while you see a guy who has been in the forum for a decade make is third or forth post. You and I would never be that guy.h