How an EM flipper coil and its EOS switch work
A flipper coil has a power winding of about 3 ohms (heavy wire) and a hold winding of about 100 to 150 ohms (fine wire). A normally closed EOS switch shorts out the hold winding so the power winding kicks the flipper. At the end of the stroke the EOS opens, putting both windings in series so the button can be held without burning the coil.
Systems
Related tips
- Flipper EOS switch: gap, checking and cleaning
- An EM flipper coil is two windings
- Weak flippers on an EM: adjust the end-of-stroke switch before buying coils
- Replacing a flipper coil
- Rebuild EM flippers before fitting stronger coils
- Bally and 1948-62 Williams (50 V) EM flipper coils
- Stronger flipper coils for Gottlieb EMs
- Gottlieb large flipper coils by wrapper colour
Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)