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preamplifier overvoltage, reverse polarity protection

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masudasim

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Hello all

I have designed a preamplifier which operates on unipolar supply +10V and draws about 20mA to 40mA depending upon jumper setting.Now i need to add reverse polarity protection as well as overvoltage protection (maximum allowable voltage is +15V)

Kindly tell me is there any simple solution available?

Best Regards
 

FvM

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A power zener or unipolar TVS diode and a series resistor. If permanent overvoltage is expected, possibly a PTC or standard fuse.
 

leo_o2

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If enough big resistor can be added and the normal function will not be affected, both over-voltage and reverse protection can be achieved only with the resistor. No diode is needed sometimes.
 

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