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Hack Namco 5in1 power supply - Simple how to
greven grevs:
I decided to hack one of these Ms Pacman games so that I can eventually put it into a bartop for a friend. Seeing as how there was not any sites showing a step by step , I decided to document my process. You can see it at ...
www.thegrevengroup.com
just click on projects.
dabone:
Just a word of advice.
Measure the voltage from the power supply AFTER you put a load on it.
(You can check for polarity without a load, then double check your voltage after the game is connected)
Without a load, the power supply will read much higher that it actually is.
Later,
adbone
RandyT:
--- Quote from: dabone on May 07, 2005, 08:32:04 am ---Just a word of advice.
Measure the voltage from the power supply AFTER you put a load on it.
(You can check for polarity without a load, then double check your voltage after the game is connected)
Without a load, the power supply will read much higher that it actually is.
--- End quote ---
Sorry, but this is not good advice. Most power supplies, especially non-regulated ones, are designed with a particular load in mind. This means that the supply expects the device to pretty much immediately draw so much current, that the voltage will drop to the expected level.
The problem is that the load created by one of these little game systems is probably nowhere near the load of an answering machine, portable TV, battery charger, etc. This means that the voltage will never drop to what is stated on the label of the power supply, and will subsequently kill your game.
The answer is to use a regulated supply. But failing that, the method used in the tutorial is indeed the best way to approach this problem.
RandyT
greven grevs:
hey dabone ,
advice taken. reading up more on the subject.
as for the game unit , it ran for about 2-3 straight today with out a problem. ;D
crashwg:
--- Quote ---!!!WARNING: MAKE SURE THAT THE WIRES ARE SECURED AND THAT NO ONE IS TOUCHING THE BARE WIRES BEFORE GOING ON!!!!!
--- End quote ---
Seriously? I've put much more voltage than that on my tongue before with no ill effects...
Disclaimers are getting a bit out of controll in this day and age. Pretty soon we'll have disclaimers on our doors urging us to make sure our shoes are tied or we may trip and injure ourselves, others or property!
BTW, I'm not trying to be a dink. I'm merely pointing out the humor of it all! ;)
PS, before it get's mentioned (because I know it will) I do realize that amperage plays an equal part in the danger of electricity and you shouldn't go out and say "hey a car batery is only 12v, that's only 3v higher than a 9v, what could it hurt?" I have yet to come across a "wal-wart" that was capable of giving more than a barely noticable tingle to the skin.
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