OverVoltage protector

187

05:41:59

If the powersupply voltage get somewhat higher than the zener voltage (around 0.7v more) it'll turn off the PNP transistor and shutdown the output.
This is usefull if your powersupply have an unknow output voltage or have a chance to get crazy and destroy your circuit, so you can use something like that to protect a microcontroller for example.
BUT, you'll have voltage drop across the transistors, so think about it if it's worth it...

published 7 years ago

BillyT

7 years ago

Nice circuit, the output could drive a relay, removing the voltage drop.

2ctiby

7 years ago

Mosfet similar circuit ...Power saving and off above 4.7v as per zener http://everycircuit.com/circuit/4630097861804032

Thrashard96

7 years ago

Fun experiment: tune to 1.85kV

2ctiby

7 years ago

Yes lol...the Mosfet version holds out here well beyond...I didn't mention it 'cause in reality neither the user nor any real components are going to feel happy at that voltage.

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