AGlass0fMilk 5 Posted July 1, 2011 Share Posted July 1, 2011 I am trying to control a higher-voltage circuit with the low-power MSP430G2231 and Launchpad that is rated for ~3.3V. The circuit I want to control is 9V. I can use a transistor for such low-voltages, but how would I wire the circuit so that both circuits have separate power supplies? I have a 3V power supply that I will use to power the uC and the other circuit has a 9V power supply as well. I'm a newbie to uC's (but not programming) and a novice in electronics so thank you for your help. Nevermind, I just connected the negative wires, is this the proper way though? Quote Link to post Share on other sites
juani_c 66 Posted July 1, 2011 Share Posted July 1, 2011 I just connected the negative wires, is this the proper way though? That's right, you need to have the same "electrical reference" in both circuits, you do that sharing grounds. Quote Link to post Share on other sites
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