I'm currently designing a H-bridge circuit for controlling a DC-motor.
I based my design of this one: http://www.jfunk.org/extras/labs/BipolarHBridgeSchematic.gif
I'm using 2N4403's as the PNP transistors and 2N4401 as the NPN transistors, and 1N4004 diodes.
Here is the schematic with my components:
(I excluded the base-resistors for now, since they are not connected yet.)
I currently have this circuit on a breadboard and using a ATX power supply to supply 12V DC.
The problem is that once i connect the power supply and power it on all of the transistors become very hot and the top-left PNP blows after about 10 seconds.
Does anyone have an idea about what I'm doing wrong here? Could it be a bad transistor or something like that? I've checked all of the diodes and they're OK.
I based my design of this one: http://www.jfunk.org/extras/labs/BipolarHBridgeSchematic.gif
I'm using 2N4403's as the PNP transistors and 2N4401 as the NPN transistors, and 1N4004 diodes.
Here is the schematic with my components:
(I excluded the base-resistors for now, since they are not connected yet.)
I currently have this circuit on a breadboard and using a ATX power supply to supply 12V DC.
The problem is that once i connect the power supply and power it on all of the transistors become very hot and the top-left PNP blows after about 10 seconds.
Does anyone have an idea about what I'm doing wrong here? Could it be a bad transistor or something like that? I've checked all of the diodes and they're OK.