H-Bridge Transistor Smoking (Bipolar BJT Transistor)

Posted on Feb 6, 2014

Using the following circuit, with 12V appplied to the motor, and either high (5V) or low (0V) to each transistor through a 1k resistor. The transistors used are TIP 142 and TIP 147. The diodes I am using are 1N5817. When I apply 0V to R2, R1, and 5V to R3, the motor runs fine; voltage across it is 8-10V. However, whenever I connect 5V OR 0V to

H-Bridge Transistor Smoking (Bipolar BJT Transistor)
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R4, the voltage across the motor is 1-2V, and the transistor at R3, starts getting really hot and smoking.

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