I do like my 52 VDC phone line generator. I have made and given away many of these. Small, compact, voltage every where, no batteries, no transformers. Just a two bit phone line cord plugs into the phone outlet and the Surface Terminal block I use to contain everything. Only 3 parts inside, LED, resistor, and a full wave bridge to keep the red clip positive and the black clip negative when the phone line has switched polarity, which I find from time to time.
Brilliant! This is the first I've heard of it... care to share again?
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