I'm in the process of building a Firefly themed pin using the Open Pinball Project boards and Mission Pinball for logic. Most of my parts are coming from a Williams Big Guns (System 11b, I believe). I would like to use the existing power supply and power supply board as they work fine. This is all pretty new to me and though I have been able to use the manual to some degree to find the wires I need I'm having trouble finding the right place to pull the ground from for the flippers. Does anyone have a source of information that might better explain the power supply to a newcomer, or better yet a blog detailing a similar process.

Thanks!

#2 6 years ago

ZAC

zacaj

RPC

Rochester, NY

11y 158K 10,387 85 122 1

OP
Quoted from Yyaaargh:
Hullo!
I'm in the process of building a Firefly themed pin using the Open Pinball Project boards and Mission Pinball for logic. Most of my parts are coming from a Williams Big Guns (System 11b, I believe). I would like to use the existing power supply and power supply board as they work fine. This is all pretty new to me and though I have been able to use the manual to some degree to find the wires I need I'm having trouble finding the right place to pull the ground from for the flippers. Does anyone have a source of information that might better explain the power supply to a newcomer, or better yet a blog detailing a similar process.
Thanks!

You shouldn't need to pull the ground from everywhere. All coils share a ground, which just goes to the ground star like all the other grounds and then to the appropriate bridge rectifier.

#3 6 years ago

DAV

wayout440

Pinside member

Berea, OH

11y 113K 11,267 3 12

Flippers are connected to ground by making or breaking contacts on the flipper cabinet buttons. In most games, the flipper ground wires return back to one if the boards where a relay is used to enable or disable the flipper by breaking that ground path for the flipper pair. From that relay, the flipper ground connects to a common DC ground with everything else

#4 6 years ago

DEC

GRUMPY

Pinside member

10y 95,050 8,702

Ground needs to go back to the source, in this case you are using the aux power supply to make flipper power so the ground needs to return to here.

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