i wish to turn on a motor using a transistor. How do i connect up on my breadboard? What do i need? Do i need to use a resistor as some people has told me?
2006-09-09 19:10:21 · 3 answers · asked by alexander81sg 1 in Consumer Electronics ➔ Other - Electronics
Transistor switching logic is very common. In today's low voltage applications it is the norm. Depending on the power requirements of the motor, you may even have to go to a Darlington arrangement. Normally, with a small motor (as in the tape deck motor in a motorcycle audio unit) all you need to do is (for pos. gnd.) use an NPN switch transistor configured with the emitter at ground and the collector connected (via a current limiting resister) to the low side of the motor. The base then goes to the control circuit ( cpu port, or what ever ) When the base goes 0.7 volts pos. the transistor will turn on and complete the path to ground for the low side of the motor. The base can be biased off via a resister to the collector and a resister to the switch. The collector will have the motor +B at the collector/base bias resister and the base will be "logic high". When the remote "switch" is pushed it crowbars the base to ground ( 0.7 )through the base/ switch coupling resister, thus turning on the transistor. So, you need a transistor, and two resisters to set up the logic switch.
2006-09-09 20:24:38 · answer #1 · answered by Dusty 7 · 0⤊ 0⤋
Go to some university engineering department website. There should be some useful information about how you hook up a transistor as a switch. What kind of transistor are you using? Bipolar? FET ?
2006-09-09 19:21:47 · answer #2 · answered by sleepysheep 2 · 0⤊ 0⤋
How much are you willing to pay me?
2006-09-09 19:17:08 · answer #3 · answered by Oh Yeah! 2 · 0⤊ 0⤋