Im trying to switch on a 5v relay (Huigang HRS2H-S-DC5V) using a digital pin on my Uno, and for some reason when I set the control pin high, I only get about 2.4 volts across the relay, the rest is getting burnt across the collector-emitter of a 2n3904 transistor. I have everything wired up accordin…

Controlling a 5v relay, only getting 2.4v?

nickgammon June 26, 2013, 3:23am 3

40 mA absolute maximum rating. Aim for 20 mA.

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