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capacitor for 12V DC gear motor

I have a 12V DC gear motor that runs at .2-1.2 amps

I do not want the motor to run if it has a supply of less than 10V from the battery

Would a capacitor be a good solution and if so, what type?

Thanks

Reply to
drjefflewis
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No.
Reply to
John Fields

No, you need to have some kind of cutoff. (view in fixed width font)

Vin-----o--------------o--. | G |S | o-[R3]--o---||-+ | T is a P-MOSFET | | ||-> | | | ||-+ | | | |D - [R1] | | ^ 1/2 W Diode | | | | | | '--o--- Your Motor | K | o---o--R^ TL431 [R4] | | A | | '---)---------' [R2] | | | GND-----o-------'

Use R1=10K, R2=3.3k, and R3 about 1k. R4 should be 100k.

When the voltage drops to 10V, it'll turn off.

Get the parts at radio shack, and make sure the Rds(on) of the MOSFET is less than 20 mOhms, and the Vth(gs) > -5V.

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Regards,
  Bob Monsen

God ever arithmetizes.
- Gustav Jacob Jacobi
Reply to
Bob Monsen

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