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Topic: MOSFET circuit working but no reverse (Read 216 times) previous topic - next topic

njdurkin

Apr 23, 2019, 05:53 pm Last Edit: Apr 23, 2019, 06:06 pm by njdurkin Reason: Figured it out.
I am using a mosfet as a switch for a dc motor controlled by an arduino mega. I want to be able to also reverse the direction of the motor. Can this be done with a mosfet? Maybe a P type mosfet?

JCA79B

#1
Apr 23, 2019, 06:32 pm Last Edit: Apr 23, 2019, 06:50 pm by JCA79B
No, you need either 4 transistors in an "H-bridge" configuration or at least 2 relays depending on the motor specs which are unknown. Something like this for small motors.
https://www.adafruit.com/product/2448
https://www.sparkfun.com/datasheets/Robotics/TB6612FNG.pdf

njdurkin

Would something like the attached image not work?

MarkT

Would something like the attached image not work?
That circuit is using two complementary power supplies, which indeed only requires two switching devices, but is rarely if ever used for standard motors as the cost of the second power supply exceeds the cost of two more
switches.

H-bridge is definitely what you need, but not knowing what motor you have I can't recommend any particular H-bridge.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

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