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Re: Reverse polarity diode circuit

 

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Color coding? ?Years ago I bought a 7A SLA battery at a swap. Late at night I hooked the clips from a small QRP rig, red to red, black to black, RIGHT? and PUFF!?

The seller of the battery had used a RED pricing sticker AND put it right next to the NEGATIVE pole of the battery. ?You know the rest of the story. ?A neat QRP rig became a box of parts to help someone else repair theirs. ?I gave it away. ?The Chinese designer (who is still in business) had put no reverse polarity protection in his circuit.

Dave K8WPE

On Dec 12, 2017, at 2:07 PM, fr.beckenbauer@... wrote:

what happened to the idea of using color coded cables and plugs, or just plugs that aren't reversible if you want to go the extra mile?
Adding a full bridge rectifier to everything can really bite you in the ass when you aren't used to being careful of polarity, and then fry something that isn't protected. So using a diode, so that the device just doesn't do anything when you plug it in the wrong way, is the safest option.

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