(Topic ID: 313510)

Bally / Stern Lamp Driver Board Tester

By AlanJ

2 years ago


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  • 88 posts
  • 31 Pinsiders participating
  • Latest reply 45 days ago by AlanJ
  • Topic is favorited by 24 Pinsiders

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#18 1 year ago

Very cool set. Been interested in doing some Bally stuff, but just don't have the time.

#23 1 year ago
Quoted from ChrisHibler:

If I may ask, there looks to be a 750 ohm and a 180 ohm resistor, assumed to be in series with the LED and power.
Why two resistors instead of one 1K resistor.

Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

One is for the voltage drop for the LED source. The other is the “bypass” resistor for the SCR load to eliminate flickering. Same concept as my adapters or Altek driver boards.

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