Review on Lystin 8 Channel DC 5V Relay Module Control Board with Optocoupler: Ideal for Arduino, Raspberry Pi, and STM32 by Matthew Owens
Yours might be a bit scratched
Everything is scratched. In my analysis they stack them on top of each other and the solder joints below have hollowed out this board.
- Electronics
- I don't really like it, everything is fine
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