#### guitardenver

##### New Member

Motor current = 8amps

V supply = 12v (car battery)

base voltage = 9v

I need a transistor that will be able to handle this current (8A). And open with a 9v. PNP and NPN

I would really like to now how to calculate what resistance value I would need so the transistor is as open as possible with least amount of resistance. Also how do I calculate the watts of the transistor? Would like a easy to understand math lesson. So I can find what transistor to use.

Also I might need like 12 of these so the least expensive the better.

Can anybody give me a link to High torque 12v motors they have to move like 80-100 or more pounds around 3.5mph. Needs horizontal mounting braket and around 11 tooth #25 chain gear on it. Specific I know.

V supply = 12v (car battery)

base voltage = 9v

I need a transistor that will be able to handle this current (8A). And open with a 9v. PNP and NPN

I would really like to now how to calculate what resistance value I would need so the transistor is as open as possible with least amount of resistance. Also how do I calculate the watts of the transistor? Would like a easy to understand math lesson. So I can find what transistor to use.

Also I might need like 12 of these so the least expensive the better.

Can anybody give me a link to High torque 12v motors they have to move like 80-100 or more pounds around 3.5mph. Needs horizontal mounting braket and around 11 tooth #25 chain gear on it. Specific I know.

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