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  • #16
    Umm....parallel circuit.

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    • #17
      Young man, I suggest you take some basic night classes in electricity and electronics. Otherwise, you are going to be dangerous around components and circuits.

      ( In parallel, 18 volts is going to burn out a lot of LEDs)

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      • #18
        Bah. Forget it. I'll just buy a pre-assembled set.

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        • #19
          Ideally you would have a separate resistor for each LED. 9v will drive them all just fine, just make sure to choose the appropriate value resistors (if you post the voltage rating of your LEDs I can help you with that).

          Also note that since you are drawing 160ma total you will probably get just shy of 2 hours out of a 9v battery. You may want to use a wall-wart instead.

          Anyway, here's a quick schematic I drew of how you can hook up your 8 LEDs:
          Attached Files
          Motors and skulls:
          http://www.division-6.com/haunting

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          • #20
            Ideally you would have a separate resistor for each LED. 9v will drive them all just fine, just make sure to choose the appropriate value resistors (if you post the voltage rating of your LEDs I can help you with that).

            The LED's I plan on using are these: http://monsterguts.com/lighting-stro.../prod_115.html

            Anyway, here's a quick schematic I drew of how you can hook up your 8 LEDs
            Ah, yes! Pictorial instructions! Now this I understand.

            Also note that since you are drawing 160ma total you will probably get just shy of 2 hours out of a 9v battery.
            Two hours of run time, eh? :/
            Last edited by Smiley; 04-01-2008, 11:23 PM.

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            • #21
              Okay, so here's what we know about your LEDs:
              Forward Current - 20mA
              Forward Voltage - 2.2

              If you use a 9v power supply or battery and the LEDs are dropping 2.2v of that, then it means we need the resistor to drop 6.8v (9-2.2). We now know the voltage across the resistor and the current going through it (20ma or .02 amps, same as the LEDs), so we can use Ohm's law.

              6.8v / .02A = 340 ohms

              The next-highest standard value resistor is 390 ohms, so that's what you'd want to use (get 1/4 watt; 1/8 watt isn't big enough).
              Motors and skulls:
              http://www.division-6.com/haunting

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              • #22
                BTW: technically you could power your 8 LEDs with fewer resistors, but this way you can have as few or as many LED/resistor pairs as you want without having to recalculate anything.
                Motors and skulls:
                http://www.division-6.com/haunting

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                • #23
                  You could buy a power supply from minispotlight, that way you aren't draining batteries. It seems to me they were like $15.00 or so. That just covers your source though, you still need them resistors.
                  Jared Layman

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                  • #24



                    Ha! Who needs night classes when I have you guys, eh?

                    Now that I've created something that works, I can start on the real thing.

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                    • #25
                      congrats, and good work!
                      -------------------------------
                      http://www.fx13studios.com

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                      • #26
                        By George, I think he's got it.

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                        • #27
                          It's alive!
                          Motors and skulls:
                          http://www.division-6.com/haunting

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                          • #28
                            O' Christmas tree, O' Christmas tree....



                            Almost done with my prop.

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                            • #29
                              Nice work. I can't wait to see your prop.
                              Motors and skulls:
                              http://www.division-6.com/haunting

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                              • #30
                                Thats awesome man it looks just like a real workbench with real tools! sweet prop!
                                Nate Mitchell|creative consultant
                                [n8 creative studios]

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