[modeleng] Re: Electric Traction Problems
- From: peter.chadwick@xxxxxxxxxxx
- To: modeleng@xxxxxxxxxxxxx
- Date: Thu, 5 Apr 2007 20:45:47 +0100
Patrick said:
>If they are, these are quit easy to make your self.
If you give me the specs, the system they use (pulse I supose...) and
some time, I will make you a circuit diagram.<
At 90 or more amps, I'm not quite so sanguine about that. For lower
currents, yes, but anything above 10 to 20 amps isn't quite that easy.
Certainly wouldn't be printed circuit board stuff, although the drive for
the switches would be. The other problem is that you'd need more than just
a multi-meter to trouble shoot it. I must admit my experience with PWM on
small DC motors was rather disappointing - and I do have a LOT of test
gear! The switching devices are going to be something, too - you won't
switch 90 amps with a plastic TO220 device!
Real electronic devices use valves and glow in the dark. Anything else is
best done with steam and mechanical stuff!!! Although for my work, it
would be difficult - can you imagine how you would make a steam powered
heart pacemaker?
Peter Chadwick
Swindon
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