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Introducing a diode between the connection of positive terminal of DC source and DC Load saves your Load/Circuit from damage due to reverse polarity of supply.
Reverse polarity protection for your circuit, without the diode voltage drop.by ccrome
Self-Correcting Polarity Protectionby tristantech
Reverse Polarity Protection Circuitsby ProvideYourOwn
How-To: Diodesby audreyobscura
DC Versus ACby KRA5H
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