motorsport_photo@hotmail.
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It would be interesting to see a scope trace of the voltage under load to see how stable it is, or if is noisy/"chopped". If clean would be a cheap solutionNot sure what people are doing for power supplies but thought i'd share after seeing a post about a TLC 13.8V supply (think it was about £40 for 30amps - actually found the link https://www.tlc-direct.co.uk/Products/SK650762.html i went about finding similar ones. Anyways, tons on Amazon rated as (fixed) 12V to power LEDs etc. I got a 480W (so theoretically 40A @ 12V) 'warehouse' return for £10 and have tested the rheostat and it seems to hold a pretty steady 13.8V no load. Not sure of the current at that voltage yet or how it will do under long term load, but will test and let you know.View attachment 329081