luni, 17 decembrie 2012

Simple RC Speed Controller

      It uses a 6 transistor H-bridge drive. Two PNP power transistors are used for the source side of the H-bridge and two NPN power transistors of complimentary characteristics are used for the sink side of the H-bridge. The bases of each sink-source pair are connected by a small NPN transistor. This allows just two lines to control the H-bridge drive. This allows forward, reverse and off control of the motor. Braking cannot be acheived with this type of H-bridge. Bipolar transistors are used because the efficiency required for this controller is low.