(Topic ID: 298163)

Classic Stern Sling Blows Transistor

By seshpilot

71 days ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 71 days ago by seshpilot
  • Topic is favorited by 1 Pinsider

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#1 71 days ago

I'm stumped. The left sling on my Quicksilver keeps blowing the transistor the second the ball hits the target. Using the correct coil (with no diode, just the one on the right), the diodes (IN4004) on the switches are not blown, and everything appears to be wired up correctly. It doesn't blow until the switch is hit, but then the coil locks on. What's my next step?

PS: top pic shows diodes cut so I could test them w/multimeter

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#3 71 days ago
Quoted from Quench:

Some Williams coils like yours don't come fitted with diodes. They are a must in these Stern games. The missing coil diode is the reason the transistor keeps blowing. The banded side of the diode goes on the yellow wired coil lug.

Thanks man. I’ll try that out. What’s word is that the right sling doesn’t have one but is working just fine! Why is that? And is a IN4004 ok?

#6 71 days ago

Yep, that fixed it! Thanks. I put one on the right sling too just in case.

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