Quote:
Originally Posted by mrnecsteve
I believe there is a differance
I would have to get out the oscilloscope to answer your question with absolute certainty....but if I were the designing engineer, I would used a pulsed DC signal in a brake controller. Brake intensity would be controlled by pulse length...not pulse amplitude. Its much simpler and far less expensive from a component perspective.(many years ago I worked as an electronic tech...it was the standard method for controlling DC servo's and motors using silicon controlled rectifiers) It also allows for matching of controller to brakes without complicated impedance matching.
A straight dc signal could activate the magnets....but I dont believe they will hum. AC based magnets or pulsed magnets hum.
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Trailer brakes will activate and him with straight battery current. I test em that way all the time
