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Author Topic: Power supply advice please  (Read 2146 times)

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Apollo

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Power supply advice please
« on: June 02, 2004, 06:04:13 am »
OK so I've got my isolation transformer connected to the mains power on one side ( 2 yellow wires in ) and I've got 2 red wires coming out of the other side that connect to my switching power supply. The red wires are identical. On my power supply I have these connections labeled +5v, GND, GND, -5v, +12v, FG, AC, AC in that order. Which connections do I hook the 2 red wires from the transformer to? I'm guessing 1 goes to AC and the other goes to the other AC? Does it matter which way around they go because I can't tell them apart.
Confused, thankyou.

Xenepp

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Re:Power supply advice please
« Reply #1 on: June 02, 2004, 06:59:30 am »
Anyone care to comment before he blows up his PSU?

'Coz that's exactly what I did and I had the very same problem  :D

Surprisingly, it's actually quite hard to find any info on wiring up arcade PSUs.

rsoandrew

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Re:Power supply advice please
« Reply #2 on: June 02, 2004, 09:44:23 am »
I don't know what type of isolation transformer is being used but make sure you check the schematic. A true isolation transformer doesn't output DC.

Now there are modern ones that put diodes on the winding taps to output DC but you need to make sure you have what you need.

SirPeale

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Re:Power supply advice please
« Reply #3 on: June 02, 2004, 09:55:23 am »
I don't know what type of isolation transformer is being used but make sure you check the schematic. A true isolation transformer doesn't output DC.

I don't believe this is the case.  He's just running all his cabinet from the iso.  Bad move, it puts more strain on it.  Use a power distro block instead.


Ken Layton

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Re:Power supply advice please
« Reply #4 on: June 02, 2004, 10:16:01 am »
Never, never, never connect anything but a monitor to the output side of the isolation transformer.

ChadTower

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Re:Power supply advice please
« Reply #5 on: June 02, 2004, 10:40:48 am »
Never, never, never connect anything but a monitor to the output side of the isolation transformer.

For future reference, why?

RayB

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Re:Power supply advice please
« Reply #6 on: June 02, 2004, 11:23:08 am »

You should read Bob Robert's lengthy page on proper game wiring:

http://www.therealbobroberts.com

NO MORE!!

Ken Layton

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Re:Power supply advice please
« Reply #7 on: June 02, 2004, 11:27:12 am »
The isolation transformer isolates the monitor's "hot" chassis from everything else and provides you a degree of safety if you touch that chassis so you don't DIE! If you connect anything else on the output side if the isolation transformer it's no longer isolated or safe.

If you do connect other things to the output side of the isolation transformer you will destroy/damage your switching power supply, game board, AND monitor immediately upon power up! All that happens in less than two seconds.

Apollo

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Re:Power supply advice please
« Reply #8 on: June 03, 2004, 07:04:26 pm »
Thanks for your replies so far. OK so lets say I have a power supply that takes 105V and I have it connected to one side of my transformer which has a 105V output. What connectors on my power supply do I connect the 2 red wires to? AC & AC?