DC Circuit Power Source Reverse Polarity Protection

This is a DC circuit protected against reverse polarity by a rectifier diode. The capacitor depicts the polarized capacitors which get quickly damaged by application of voltage having a reverse polarity. The LED gets lit when a proper polarity is applied and turns off otherwise. Moreover, the LED can go into reverse breakdown since their reverse breakdown voltage is typically low. The Zener diode, current-controlled voltage source and the lamp simulates a lamp that can be damaged by the application of incorrect polarity. An undesirable effect of this protection scheme is the voltage loss due to the diode's forward voltage. To minimize the voltage loss a Schottky diode should be used in this application. If this voltage loss is is still intolerable mechanically polarized power connectors should be considered. When Sdircon is open the diode provides reverse polarity protection when Sdircon is closed the diode is bypassed.