Review on 🔴 Highly Effective 8 Channel 5V Relay Module with Optocoupler Isolation for High/Low Level Trigger Relay Support – Red Board by Devin Lukydoo

I'm currently powering the relay with an old Roku 12V DC 1000mA transformer with no problem. I soldered a large LED flashlight onto it, which takes some of the 3 volt load from the transformer after passing through the voltage regulator with a 5 volt output. On the other hand I have a proximity switch that sends a signal to a second relay switch. I plugged it in, so if you bring a metal object close to the proximity switch, it opens the flashlight circuit to turn off the light. Everything works as expected. The only thing that gets hot is the 7805 voltage regulator IC, which draws about 500mA of current, blocking the extra 7 volts and converting it to heat.