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Any electronic wiz's out there?

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Samstag:
Sorry I thought that was the most common name for them.

I would refer to it as just a 9v power supply, but for some reason that confounds and intimidates people.  Then I say, "you know, a wall wart" and they relax and say "oh ok I probably already have one of those."

AceTKK:
a simple 9v battery might do the trick too.  Depending on how often you play gun games it might or might not last awhile.

-Ace-

Ed_McCarron:
Isn't the power provided by a USB connection 5v?

If it is, you SHOULD be able to break the pin 1 connection in the cable.  Keep the Ground, data +, and data - lines straight thru.  Supply your own 5v power supply on the device side of the cable.  Tie the power supply ground to the USB ground.

Make sure that the 5v supply supplies enough current for your needs.

Unless the remote device has some kind of regulation, I'd be afraid to put 9v in to it.

Theory only there...

Ed_McCarron:
Wait... why reinvent the wheel.

Shouldn't a powered USB hub do this???

tivogre:
The guns need +5 AND +9 volts.

Unless you want to cut the PS2 connectors off of the guns, you will need to splice +5V and +9V into a PS2 extension cable (with one end cut off) for each gun.

The "circuit" you need is really just taking +5V, +12V and Ground from a spare hard drive connector, and converting the +12V to +9V with a voltage regulator chip.

At that point, the +5V, +9V and ground can be fed into the PS2 cable(s) for connection to the gun(s).

While the chip is inexpensive, it isn't readily available at most walk-in places.  You'll also need some wiring, a piece of PCB, a hard drive "Y" cable, and a couple of PS2 extension cables.

All told, the parts can be had for about $15-$18, if you can find them, and can find used PS2 extension cables.

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