View Full Version : optocoupler 4n95 with motor, problem

08-10-2006, 01:56 PM
i am trying to drive a remote control car motor using a 4n35 optocoupler with a 9V Battery.

But am unable to drive it. maybe becaues of very low current i am getting.
Plz guide me as what to use instead of 4n35 (if its wrong) or tell me how much loss is there that is giving me so less current.

08-10-2006, 03:39 PM
We wish to help you, but the information tht u provided is too vague. be a bit more discriptive about ur circuit. a diagram will be useful.

08-10-2006, 03:59 PM

in circuit maker, this circuit works. but in actuall the current is of about 50mA which is not enough to run the motor.
what should i do.

08-10-2006, 04:15 PM
Thats right, the circuit wont work.
you cant drive a motor like that, too little current. One simple method is to add a tranisistor at the output of the optocoupler and use it to drive the motor. 2n2222a will be sufficient to drive loads of upto 800ma. if your motor demands more, then use a power transistor or a relay.
And dont forget to add a flyback diode across the motor!

08-10-2006, 04:44 PM
thanx mohit, will use the transistor to amplify the current.