#25: Transistor H-Bridge Circuit for Microcontroller

Build a transistor based h-bridge circuit that can be controlled by two microcontroller ports for direction and speed by using PWM or pulse width modulation. Resistors R1 and R2 should be on the collectors of Q3 and Q4 respectively. See the correct schematic and parts list here: breadboardcirc...
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#hbridge, #transistorprojects, #bipolarjunctiontransistor, #motorcontrol, #pwmmotor,#breadboardcircuits
The circuit described in this video is for entertainment purposes only and any usage of such circuit or associated information is done so at your own risk and/or liability and should be approved by a licensed Engineer in the appropriate jurisdiction if to be used in any form beyond that of the hobbyist's project bench.

[@Usnveteranstacker]

Dude you really need to make more videos, your teaching style is definitely for me

[@Enigma758]

Nice video, thanks. One question though, I'm not sure why R1 and are R2 are on the emitter side. Would there be any reason not to have them on the collector side?

[@BBCircuitsbySteveMorrison]

Nice catch. Thank you. I'm actually not sure why I put them on the emitter side other than trying to rush the circuit together. As it is, the current through Q3 and Q4 is so low, that the voltage drop across R1 and R2 is low enough as not to raise the required base saturating voltage above 5v w/r to ground. However, a high enough current through the main drivers could ultimately require Q3 and Q4 to need too high of a base voltage to do their job. So It makes much better sense to put them on the collector side so as to guarantee a base voltage below that which a microcontroller can supply. I added a video caption to reflect that correction, as well as updated the schematic in the article referenced in the video description.

[@kamleshchavan7451]

Sir any small simple Remote Control project controlling dc motor using bread board, transmitter circuit on one bread board and receiver circuit on another . But project should be with out any transmitter and receiver module's e.g. 433 mhz transmitter and receiver module's. There should not be any module on transmitter or receiver side