Specifically 1967 Bally Surfers. Anyone have an idea why Bally used a flipper coil on the bumpers with two EOS switches?
50 volt game, power winding is 3.8 ohms, hold winding 31.3 ohms. Is this purely to avoid burning up the coil should a bumper lock on for some reason?
Quoted from pinballdaveh:If 1 of the end of stroke switches is a normally open it might power the 3rd flipper.
The third flipper is powered by the right flipper button. Totally separate circuit from the bumpers. All of the switches are NC
Oops I thought you were talking about flippers. The schematic shows 2 part coils for the thumper bumpers with 1 normally closed end of stroke switch. The 2nd normally closed switch probably opens the thumper bumper relay hold circuit.
Quoted from pinballdaveh:Oops I thought you were talking about flippers. The schematic shows 2 part coils for the thumper bumpers with 1 normally closed end of stroke switch. The 2nd normally closed switch probably opens the thumper bumper relay hold circuit.
Yep. But why do this? Why a flipper coil on a bumper? Plus they did this on mushroom bumper relays too.
I think at the time, Bally was concerned about power draining on the circuits.
I know a high draw current coil can trip a "game over" while playing a game.
So to keep this from happening, dual wound coils are used for high impact
components used in a game.
New transformer designs would upgrade EM pinballs to eliminate the practice
of dual wound solenoids and relays, to where only on a few occasions, a feature
circuit would need the dual windings to be used.
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