Re: Newbie (ignorant) tech question



Dan Beck wrote:

Hello all,

I have a constant duty AC (28 VAC) motor that runs in one of my pinball
machines. I wish to control power to the motor such that it only runs
during gameplay. There are "recipe" circuits that do this for DC motors
that do the same thing, in pinball machines. The heart of this "recipe"
circuit is a TIP125 transistor. Will this transistor work in an AC voltage
circuit?, Or, is control of AC motors more complicated than I am
anticipating?

That TIP can only control DC.

However, if you interpose a bridge rectifier in series and connect the TIP
across the + and - of the bridge then it will work with certain reservations
about grounding that circuit and how the on-off control is derived - it may need
opto-isolating. I could only advise if I saw your application circuit.

Graham

.

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