This is neat, and surprisingly low-priced too. Instead of just getting a panel indicator light-weight it also displays the provide voltage. That’s a quite pleasant solution for brief diagnostics. The good quality of development appears Okay. Pretty straightforward and perfectly rated factors for standard mains voltages, even though the sense resistor could not be rated for the bigger phase to phase voltages.
Ability dissipation is minimal at about half a watt with predictably weak energy aspect (.07) because of the straightforward capacitive dropper and minimal circuit voltage. There is certainly no significant heat getting dissipated on the PCB.
The new music monitor referenced is an aged fairground basic termed Dominator:-
Carl Cox mix:-
This is a common ebay research connection for the meters:-
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