my motor is 12V and consumes 150mA
150mA??? baby FETs....
in that case Hero999's circuit is more than adequate... it is the same as the bottom schematic you posted but with Hero's reduced Q count, look at where your motor is in that one, plus it has the back EMF diodes Hero999 was talking about. You may even be able to reduce the FET size.
and REPLACE RL (R load) with the motor... in this case, the motor IS R load... + or - to either side, the only difference it will make is which way the motor spins per which input you turn on. Do NOT turn both inputs on at the same time. L = OFF, H = ON.
Last edited: