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Gottlieb EM 4 Player- Start up Animation


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Yes, it's bloody BRILLIANT!! I have been following this guys work as he put this animation together on Pinside - very, very well done.

 

I believe he is doing a few more as well??

 

I think it will help a lot of people have a go at an EM where previously they may have been reluctant....

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At the 5:15 point in the animation there is the quote about the 'hold in resistor' keeping Z1 energised. Can anyone explain in theory how this resistor is able to keep Z1 energised ?
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At the 5:15 point in the animation there is the quote about the 'hold in resistor' keeping Z1 energised. Can anyone explain in theory how this resistor is able to keep Z1 energised ?

 

Found this online:

 

 

PICK/HOLD Power Consumption

 

"Once a relay is energised it doesn’t need that much current to hold it’s contacts. Usually a relay needs only about 50% of energise voltage to hold it’s position. So the relay needs higher current only at the beginning to pull contacts from one end to another. For example relay that I was testing earlier has 12VDC coil, but it can be easily pulled-in at 9V and reliably hold it’s contacts at about 4V."

 

This places less strain on the relay coil and as a bonus, when released the relay will drop out faster and have a lower back EMF (not as important in an EM pinball)

 

I don't know if this is the reason they used resistors in EMs but it sounds sensible to me :unsure

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