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    Simple logic circuit to light LED 1, or LED 2, or LED 3 based on NOR/AND input?

    I need to build an automobile  circuit that lights LED 1 if circuit A sends it 12v; lights LED 2 if circuit B sends it 12v; or lights LED 3 (and not LED 1 or LED 2)  if both circuits send it 12V. I figured it out using three relays, but I'd much prefer a non-mechanical solution for reliability...
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    Power LED 1, or LED 2, or LED 3 with AND logic

    I need some help building a simple circuit  (logic wise it's simple, that is). I can build it with three mechanical relays, but I'd prefer to do it with solid-state components. Unfortunately my electronics knowledge doesn't extend much beyond a basic understanding of simple components. Here...
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    12v / 400ma - what gauge wire?

    I have a circuit of relays and diodes. Total draw will be 400ma at 12 volts. (Actual PS delivery is 13.2 volts). What gauge wire do I need to safely hook this up? 
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    SImple question on proper diode/LED voltage supply

    I am setting up a small circuit that will use LED's. The source power supply is marked 12volts, but actually delivers 13.2 when tested. The LED's in question are rated 2.1v adn 2.4v (red and yellow). Here's my question: how critical are the voltages in terms of reasonable LED life and proper...
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