I am designing a speed controller circuit for a cordless drill and have circuit but not sure if my circuit is correct.

The PIC provides PWM to the L293D which can be in forward or reverse (I haven't added the switch for that to the circuit yet)
Would this circuit work for a 12v motor in a drill or would it require transistors / MOSFETs due to the L293D only being able to output 600mA?
If this wouldn't work can anyone suggest would the L293D could be replaced with / added to the circuit?

Thanks for any help given.

Yeah, you need a heavy MOSFET output stage. Drills take something like tens of amps under load.

The L293D isn't appropriate for this circuit. With a reversal switch, you only need a single N-channel MOSFET, you'd just hook the PIC's PWM pin to the gate and you're done. If you're doing an H-bridge, you need 2 P-channels & 2 N-channels. You generally turn on one of the P's with a fixed voltage and feed PWM to one of the N's.

Thanks for the help , I'll start redesigning my circuit later today and let you know what I come up with. :lol: