(Topic ID: 201129)

Bridge rectifiers Flippers

By 3rdaxis

6 years ago


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  • 12 posts
  • 5 Pinsiders participating
  • Latest reply 6 years ago by 3rdaxis
  • Topic is favorited by 2 Pinsiders

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#1 6 years ago

So I have a 1974 Williams Astro Flite I'm restoring for a friend.He probably hasn't played it since he was a kid. So I got it back together and let him play it and he was so let down. The disappointment on his face after he first flipped a ball, The humming sound of the coils was unexpected too. So I had an idea, throw a BR on it! lol. I've seen people do this before on pop bumpers and such. And I'm also sure i am not the first to try this but for those who don't know yea, it more the doubles the power output of the flippers even with sloppy old assembles and the hum is completely gone. And you wouldn't know it until you flipped a ball. The clatter of the flipper actually seems quieter.

After playing it for awhile lol, I quickly realized i had to tune it down. Too strong. Way too strong. So,I know i have to increase the resistance of the coils to dial it back a bit but how much? It's just way to strong even at a 8 degree PF angle. I guess now it's kind a cool because i have more horse power to work with. Thinking i will try one step up in the windings# and keep the same gauge. See what happens. Needs new coils anyway. What do you guys think? And have you even done this before? And what do you think about an in-line fuse on the DC side?

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#3 6 years ago
Quoted from schudel5:

Most Williams from that era have a bridge powering the pops, flippers and slings. There is a fuse and capacitor in the circuit as well.

Yep, it originally had a ceramic BR and cap but just on the pops and sling coils. So these coils are a #FL-20-300_28-40. I think "20" is the gauge and "300" is the winding. But what is 28-40? And, should i use diodes to keep the induction from damaging the BR and capacitor?

#4 6 years ago

Maybe i'll just order a stock coil and use in-line resistors. Haha, or maybe a pot. Ooooo that would be cool. Any power you want.

#7 6 years ago

So the hold winding is 28 awg and 40 turns? And the power winding is 20 and 300?

#8 6 years ago

What i really need to know is what the resistance of these are. I want to set the power up just right so i am using resistors to get the value i will need in the end for that preferred power.

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