![]() The transistors would burn up, and you could damage your power source. Transistors to come on giving a direct path to ground. Making S1 = 1, S2 = 1 would be bad and should be avoided. Making S1 = 0, S2 = 1, S3 = 0, S4 = 1 the motor would also brake Making S1 = 1, S2 = 0, S3 = 1, S4 = 0 the motor would brake (slow down quickly) Making S1 = 0, S2 = 0, S3 = 0, S4 = 0 the motor coasts Making S1 = 0, S2 = 1, S3 = 1, S4 = 0 the motor would go backwards Making S1 = 1, S2 = 0, S3 = 0, S4 = 1 the motor would go forwards Here is a H-bridge using four 2N2222 transistors. This "driver" allows you to run the motor forwards and coast it. The diode provides a path for this otherwise, the transistor could be burnt out by switching the output off. As the motor is an inductor, when you turn it off the energy has to go somewhere. ![]() Here is probably the simplest circuit: +12V -+-+ ![]() Also, the 2N2222 is rated for 40V maximum, so you can't drive high voltage motors. So any motor you use must not consume more than this current when spinning and when stalled, or the transistor may burn. Is the motor AC or DC? Do you want to be able to vary the direction of the motor? How about the speed? What about braking the motor?Ī 2N2222 is quite a powerful transistor, but is only good up to 800mA or so.
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