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(Topic ID: 292959)

No-pop speaker noise eliminator for WPC

By marschner

2 years ago


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  • Latest reply 2 years ago by marschner
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#55 2 years ago
 
BOB

pinballtoys

PinballToys

GB Worthing

8y 46,650 125

OP
Quoted from marschner:

I have now tried one of the UPC1237 boards in my TZ.
I have used a separate 12V DC power supply for the relay instead of the 18V from J501. Just to be sure not to interfere with the onboard electrics.
The pop noise when turning the power off still exists though. The power supply for the 1237 board does not turn off quick enough to avoid the noise
Someone knows what to do to make the supply turn off immidiately when turning off the power?

you will need to use the ac voltage from J501 as it 'disappears' instantly when turning the game off.
If you use DC then it takes time to disappear due to the internal capacitors.
Cheers Bob

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