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Thread: Wiring Problem. Hope someone here can be of some help.

  1. #1

    Default Wiring Problem. Hope someone here can be of some help.

    Been working on a vintage Graflex ANH Build. First one.
    Installing a P4 Diode on a Star Base, 14500 Battery, Nano Sound Board, 5 LED's for the Crystal Chamber set up
    http://www.superbrightleds.com/morei...e-flat-tipped-
    1200-mcd/265/1192/
    And the standard Bass Speaker and Button.
    I have had several people suggest I modify the schematic since I had issues the first test. Everything has been rewired to match the picture (Battery is a 14500).
    Hit the button and everything works as it should, HOWEVER, the resistor for the P4 immediately started to get HOT and smoke, after 60 seconds. The resistors on the LED's got a bit warm, but i think that may be expected.
    There's a 1 Ohm 2 Watt on the P4 i think it's the metal not carbon, and a 3.9 Ohm 1.4 Watt on each LED.

    Revised (1)_620x280 (1) (1).png

    http://www.fx-sabers.com/forum/index...ach=2847;image

    Hopefully this pic attaches and is legible.....

    Any help about the overheating Resistor would be wonderful; i'm not electrically skilled outside of just putting things together; the Resistor stuff if beyond me.

  2. #2

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    Well, like Luminara said on FX, you shouldn't use metal film resistors. The resistor value for the p4 looks good, so my next step would be to check to make sure your new carbon or ceramic resistor is on the (+) pad. Other than that, I would try taking one or more of your accent LEDs out of the picture, and see what happens. Resistors do get warm, it's how they get rid of the excess voltage and current. Your other option is to try with a 1 ohm 3 watt resistor, but it might dim the P4 a little, but it shouldn't smoke.
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    "Yeah, yeah, I've heard it all before... you want blindingly bright, super loud, running 1138 blinkies off of the cheapest sound card you can find AND you want all of it to run on a battery the size of a dime, and run for a very, VERY long time. That one cracks me up every time..."
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  3. #3

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    Upping the wattage of the resistor won't affect the brightness of the LED. It should eliminate the overheating issue. In many cases, a burnt resistor is an indication that the wattage you used was too low.
    We all have to start somewhere. The journey is all the more impressive by our humble beginnings.

    http://led.linear1.org/1led.wiz for the lazy man's resistor calculator!
    http://forums.thecustomsabershop.com...e-to-Ohm-s-Law for getting resistor values the right way!

  4. #4

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    So a Carbon 1 Ohm 2 Watt on the P4 should fix this heat/smoke issue?

  5. #5

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    If it doesn't, then a 1 ohm 3 watt definitely will.
    We all have to start somewhere. The journey is all the more impressive by our humble beginnings.

    http://led.linear1.org/1led.wiz for the lazy man's resistor calculator!
    http://forums.thecustomsabershop.com...e-to-Ohm-s-Law for getting resistor values the right way!

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