Hello, I'm using my arduino to measure temperature and then control fans, via a transistor, depending on the temp. I'm currently using an unregulated 9v wall wart and since this is in a small environment the heat produced by the arduino's voltage regulator dropping the ~12v to 5v interferes with th…

Dual output power supply and sharing grounds -how?

Grumpy_Mike June 4, 2010, 8:17am 4

There is no issue with connecting the grounds together in this supply. It is quite safe to do.

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