(Topic ID: 220816)

Doodle Bug Magnet Resistance?

By zacaj

5 years ago


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  • 15 posts
  • 6 Pinsiders participating
  • Latest reply 5 years ago by MarkG
  • Topic is favorited by 1 Pinsider

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#11 5 years ago
Quoted from zacaj:

Measured the magnet at 54 ohms. Could anyone confirm if that's right?
119VAC going to the coil, can't see any change when jumping it but its hard to tell.
I had the switch adjusted about as close as I can. If I make it wider the ball just moves even less, or gets nearly stuck on the center. Even with the closest setting, the magnet isn't strong enough to get the ball to the top.

Parts catalog says the magnet is 20A-8702, which is just the old baseball game magnet, which my notes say I've measured at 48 ohms, so close enough.

Catalog says the ball is 20A-6518, which is also the baseball game ball, which is indeed 7/8" as previously mentioned. If it's not the original ball, the iron content might be too low or something. With 115VAC going to it, that magnet should be plenty strong to fling the ball up to the top of the assembly.

The schematic calls for a 500 ohm 10W resistor in parallel with the magnet, presumably to cut the power a bit. Is that resistor there and correct? If someone substitute a lower-ohm resistor it would cut the power to the magnet.

3 relay switches are in series with the magnet (one on the Doodle Bug relay, two on the pulse relay), are those are clean and well gapped?

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