Electric-crowbars


Posted on Jun 6, 2012

To avoid grief when using 12-V power supplies with mobile transceivers, especially when there is a short -circuit failure of the series pass transistor, crowbar circuits provide protection by clamping the power line and blowing the fuse within microseconds of an overvoltage condition. It is a good idea to incorporate the crowbar directly into the transceiver.


Electric-crowbars
Click here to download the full size of the above Circuit.

The main difference between the two circuits is that less complex circuit B depends on component tolerances for the exact trigger level, while the circuit A includes a unijunction trigger to permit precise setting of the operating point.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

µCurrent Adaptor for multimeters
Switching Improves Regulator Efficiency
ultrasonic receiver circuit
Generate Dual Voltages That Track By Percentage Of Range
basic circuit diagram for pc to microcontroller communication
Electronic Dice circuit
High-Voltage Pulse Generator
Valve Tube Audio/Modulation Amplifiers 15W and 35W



Top