(Topic ID: 135382)

Baby Pacman and playfield LEDs - Any flicker?

By Vannos

8 years ago


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  • 11 posts
  • 7 Pinsiders participating
  • Latest reply 8 years ago by Riptor
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#5 8 years ago

Babypacs don't have flicker with LED's. Lamp circuit is similar to the later Bally 6803 games which typically don't have flicker.

#8 8 years ago
Quoted from barakandl:

Is the reason they dont flicker because of the multiplexing of the SCRs or the speed the CPU updates the lamp states??? The SCRs are the same ones on early bally games that do not latch properly at the current used by a single LED. I would assume LEDs would flicker in 6803 games like they do in -35 games (really bad).

The 6803 games (and Baby Pac) use a single SCR to control 2 discrete lamps. Using AC voltage 1 lamp is controlled during the positive half wave of the AC and a second lamp is controlled during the negative half wave of the AC.
Most of the 6803 games work fine with LED's, but apparently a few don't behave. I have done BW100, strange science, and a few more successfully, however the Special Forces I just did had issues, had to swap to a different brand to get them to work correctly.

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