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We just recently roasted that crappy circuit, and Aaroncake's site in general.Norlin said:https://www.aaroncake.net/circuits/lightdrk.asp
replace the 9V source with 5V
replace the relay with your DMM or whatever else you're using that needs to read the 5V output
Or if you need it clean 0V and 5V, connect a buffer IC in place of the relay