Normally you can't put LEDs in the controlled lamps in a middle earth because it runs warm filaments. Did you modify the drive circuitry?
(Topic ID: 276316)
Linked Games
Airborne Avenger
Atari, 1977-
Middle Earth
Atari, 1978
-
Space Riders
Atari, 1978
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11 months later
Quoted from Quickdraw19:What is the issues with having LEDs on the Ataris? Do they just not work? I have a Bally Eight Ball that came with LED's, but they kept blinking. I learned that the LEDs don't draw enough current through the driver transistors to stayed locked on. I got an adaptor board to solve that problem. I read that another solution is to attach a resistor to the bulb socket. Do Ataris have the same problem or is it something else?
Atari games are always running a very small amount of current through feature lamps. This was intended to keep the filaments warm, and the thought was that they'd burn out less frequently resulting in less operator maintenance. LEDs require very little current and voltage to illuminate, so installing some brands of LEDs in the feature lamps result in them being lit all the time.
It's possible to build a circuit that will avoid this, but I have yet to sit down and actually sort it out.
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