Recent content by LesCir

  1. L

    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...
  2. L

    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...
  3. L

    12v / 400ma - what gauge wire?

    Thanks... you're right, even with my enclosed wiring, it looks like anything in my parts box will do it :-)
  4. L

    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? 
  5. L

    SImple question on proper diode/LED voltage supply

    Thanks boys. I'll start at 1K and see how bright they are. I only need reasonable brightness and these will probably last a lifetime with those parameters.
  6. L

    SImple question on proper diode/LED voltage supply

    Whoops - typo above! I meant 470 ohms, not 470K ohms. I think the are some minor errors in my earlier calculations, but after correcting them I still end up with the same rough numbers. I'm taking the 13.2V supply voltage and subbtracting the LED's operating voltage of 2.1v. That gives me a...
  7. L

    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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