Has anyone reverse engineered a "Led Keeper" tool. Here is a url to a short youtube video showing a guy using one. I have a tester I can use for the "fuse" test and the "single led" test so I am only interested in the part that helps locate the bad led fast. I'm thinking it might simply just has a 9 volt battery and a momentary switch with at least one lead wire having a wire insulation piercing conductor. Any schematics? Any advice is appreciated! ...........................Thanks

 

oops forgot to paste

 

This will fall under a frequently encountered roadblock at this site. The site owner has decided that any projects using mains power, and transformerless power cannot be discussed (emphasized with a second rule that specifically says no mains powered LEDs.

 

There is something wrong with the schematics in post #1. 110V goes into the stacking plug and 110V comes out of the socket. The test circuit is in parallel with the AC. If you're not wearing rubber gloves, you'll get a shock when clipping the alligator clip on the wires.

May be 110V is not harmful enough, but think of the 240V that are being used in Asia and Europe.

Allen

 

The topic was violated the rules of Transformer-less power supplies, so this thread will be closed.

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