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Hello, if one used LEDs that are 12 volt compatible are the 330 ohm resistors you have shown still needed? I intend to include a 3.3 volt output on mine, I also have purchased this output meter and will have it tied to the 12 volt output as it will be used more often than the others in my situation. I'm still uncertain of how to connect it to read the amps, the instructions were non existent, this is what I want to use, I used pairs of binding posts instead of the common ground as you did.
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