Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up Try the site in https mode Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

  

Author Topic: Failed circuit and hot wiring  (Read 851 times)

0 Members and 1 Guest are viewing this topic.

DrFrag

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 215
  • Last login:December 15, 2011, 10:14:47 am
    • MAME Cab Worklog
Failed circuit and hot wiring
« 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.  :(

Kevin Mullins

  • Trade Count: (+2)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 4504
  • Last login:February 01, 2021, 01:29:34 pm
    • Me on Myspace
Re: Failed circuit and hot wiring
« Reply #1 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.
Not a technician . . . . just a DIY'er.

BobA

  • Trade Count: (+14)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 5943
  • Last login:July 11, 2018, 09:52:14 pm
  • What Me Worry?
Re: Failed circuit and hot wiring
« Reply #2 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?