Guys,

Need some advice on incorporating a reverse protection circuit and possibly over voltage into a project. I came across this circuit, but the suggested MOSFETS are now obsolete



Q1 and Q3 are VISHAY SQD19P06-60L-GE3 MOSFET Transistor, P Channel, -20 A, -60 V, 0.046 ohm, -10 V, -1.5 V
Q2 is a INFINEON BSS83P H6327 MOSFET Transistor, P Channel, -330 mA, -60 V, 1.4 ohm, -10 V, -1.5 V

D2 is a 30v or 33v zener, with 12v or 15v zeners for D1, D3 and D4.

however there are no mention of the resistor values, which makes the schematic a bit pointless !

Anyone have any suggestion, or a simplified method to protect the ongoing circuit from reverse polarity. I'm not that worried about over voltage, however having a means of preventing the output from going over 13v would be handy