(Topic ID: 254325)

Increasing flipper strength recommendations?


By EdHess

8 months ago



Topic Stats

  • 56 posts
  • 18 Pinsiders participating
  • Latest reply 7 months ago by EdHess
  • Topic is favorited by 6 Pinsiders

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#43 8 months ago
Quoted from slochar:

I took apart a Bally flipper coil a while back to determine if they indeed were parallel wound, and they are.

Erm the two windings on those old Bally flipper coils are connected in series. What do you mean by they're parallel wound?

#45 8 months ago

We might be looking at this differently which is what I'm trying to understand.

There are two windings on the Bally flipper coil (4 wire ends).
Thrust winding (short thick wire) deep inside around the bobbin, and hold winding (long thin wire) over the thrust winding.
Thrust winding on the side lug connects to ground via the flipper switch.
Other side of thrust winding ends on the middle lug where the hold winding starts.
Other side of the hold winding ends on the other side lug that switches to 43 volts.
These windings in total are connected in *series*.

F14 Tomcat apparently has Parallel wound flipper coils. Looking at the F14 Tomcat flipper schematics, both the thrust and hold windings connect at power and switch to ground which tells me they are indeed parallel connected.

Now I know nothing about games post '84 but look at the schematics... Or is there some other magic to parallel vs serial wound flipper coils?

FlipperCoilWiring (resized).jpg

#50 8 months ago
Quoted from slochar:

So the theory would be players that like to hold up the flippers a lot will not be heating up the thrust winding in this case - but on Bally coils you're adding in the hold winding to the thrust winding

When the flippers held up, the voltage across the thrust winding becomes almost negligible due to the high impedence of the hold winding so the coil shouldn't be getting hot due to the thrust winding still being in circuit.

Quoted from slochar:

So - what's to prevent someone from re-wiring a bally coil to behave like the williams' definition of parallel wound?

Nothing really, but what exactly do you gain? Is there some Williams service bulletins explaining the benefits of parallel connected flipper coils?

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