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Thread: Issue with LED and Transistor

  1. #1

    Default Issue with LED and Transistor

    I have everything wired up correctly. When I hit the switch the sound comes on. Swing/Clash is working fine also. The issue I'm having is the when I plug in the battery, the LED'S come on, and the transistor starts getting really hot. Using the switch doesn't shut them off. I can't see any spot where they would be short circuiting. I'm using the Luke Skywalker BladeBuilder board with the tri-cree LED, a 18650 battery, and a TIP42G transistor. Any ideas?

  2. #2


    Okay, so I did a little troubleshooting, and I'm finding that the issue is the connections for LED's on the board. They're not stopping the current.

  3. #3


    If I wire the LED- to the speaker, that seems to work perfectly. Is that okay?

  4. #4


    Yes that's one of the way many have done it. It is a good way to get the flicker effect.

  5. #5


    Are you sure you had your transistor wired correctly in the first instance? I've never had it even get warm.

  6. #6


    As far as I could tell it was wired correctly. Gate to LED- on board, collector to LED+, and Emitter to Battery+. I had everything working but unfortunately I couldn't get it all to fit in the hilt. I elected to go without sound instead. It looks fantastic so I'm fine with it.

  7. #7


    If you are happy with it, that's all that matters.

    Here's a peak at what I crammed into my hilt:

  8. #8


    I have had chinese knockoff transistors tip42c get warm.

    Usually its from shorting two of the legs if it is genuine. I couldn't get enough juice to power an LED fully from the speaker on the Rey Bladebuilder. It might be from the transistors I am using.

    You could in theory wire up two led Die one from the speaker ground and one from the Original LED ground.

    It is pretty fun upgrading the toy soundboards. I recommend installing a better speaker as well.

    JBkuma, That's some cramfu skill , All of that and a crystal reveal? All the beautifull electronics in the core deserves a little better than a pvc hilt though. I hope to finally flash a bootloader onto my arduino clone. Its a bit tricky.
    Last edited by Whosle; 03-21-2017 at 08:43 AM.

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