Logic circuit and motor?

Question

Hi,

How could a 5-volt logic circuit control a 12-volt motor? Which parts of the circuit are 5-volt and which are 12-volt?

Here's the diagram of the circuit: http://i137.photobucket.com/albums/q208/infinitbelt/circuit.jpg


Any ideas?


Thanks!

Answer 1

Since the circuit has only a 5V supply it is unlikely to drive the motor if the motor requires 12V.

If the motor is indeed a 12V one, then there needs to be a 12V supply too, with its negative pole connected to the negative pole of the 5V supply.

The motor would be connected from the fet's drain to the 12V positive pole.

The closing and opening of the switch removes or applies bias to the fet's gate.

With the switch closed there is no bias, the fet will not conduct.

When the switch is open bias is applied and the fet will conduct current from the supply and through the motor.