H bridge motor circuit - Electronic Circuits Projects Diagrams Free

flemmard · 11th September 2007, 09:20 PM

Hi,
Wish to know the components and their values for this circuit?
Please help !

And if i need to rotate the motor forward/reverse using PIC 16f877 what should i do ?

What are B and C in this circuit?

Just A is enough to rotate in both directions?

THANKS

audioguru · 11th September 2007, 10:11 PM

It is a bridge. If you don't properly drive all 4 inputs then it will make a lot of smoke.

For the motor to turn one way, A and B must be low, and C and D must be high.
For the motor to turn the other way then A and B must be high and C and D must be low.

philba · 11th September 2007, 10:33 PM

why don't you google for "h bridge circuit mosfet" You will be surprised how many hits you get.

and, yes, just having 4 "naked" control lines is risky. Turn on both the upper and lower mosfets and you've created a short to ground. poof!

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11th September 2007, 10:11 PM	(permalink)
audioguru	It is a bridge. If you don't properly drive all 4 inputs then it will make a lot of smoke. For the motor to turn one way, A and B must be low, and C and D must be high. For the motor to turn the other way then A and B must be high and C and D must be low. __________________ Uncle $crooge

11th September 2007, 10:33 PM	(permalink)
philba	why don't you google for "h bridge circuit mosfet" You will be surprised how many hits you get. and, yes, just having 4 "naked" control lines is risky. Turn on both the upper and lower mosfets and you've created a short to ground. poof!