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Main => Main Forum => Topic started by: DrFrag on March 06, 2009, 12:08:16 pm

Title: Failed circuit and hot wiring
Post by: DrFrag on March 06, 2009, 12:08:16 pm

I've wired up a bunch of admin buttons in my cab, along with LED lights that show which ones are active.  The idea being I can disable selected admin buttons via internal switches for use at parties, etc.

There are 12 LEDs wired in parallel, each with their own resistor.

I'm pretty sure it's all wired right, but the LED lights don't come on.  After a few seconds, the positive wire coming off the 5V line at the PSU gets really hot.

What might I have done wrong?

I'm thinking I might have used wires the wrong thickness or length, but I'm no expert on electronics.  :(

Title: Re: Failed circuit and hot wiring
Post by: Kevin Mullins on March 06, 2009, 12:26:38 pm

Do you have any LED's that are backwards?
(LED's have a positive and negative leg)

If they aren't even coming on AND the power line is getting hot..... sound like a near short to me.

Title: Re: Failed circuit and hot wiring
Post by: BobA on March 06, 2009, 12:53:15 pm

If the LEDs were in backwards they will not light but they should block current flow unless one is internally shorted.   Sounds like a wiring error or something shorting out.  Can you take pictures up close and provide a diagram of what you did?