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LordDamo:

Is the unit your building going to be like a bartop style thing? I.E. the tv and Jakk's units in the same unit? or is this more of a portible unit that you can take anywhere and plug into a tv?

Really, you dont need the batteries in one of these things. Its better to wire a transformer up to it. It will save you money (no need to buy batteries all the time) as well as the environment (not buying batteries, so you wont be throwing them away).

Druin:

Yes it's very wrong to have batteries and some other voltage source connected in parallel - just think about all those warnings about not putting normal batteries in a battery charger and that should suffice.

So to give a unit 2 options of power source, as mentioned the power sources have to be somehow switched between, whether it's a plug with switching capabilities or just an added toggle switch that routes one source at a time to the unit.

As for measuring a higher voltage on a transformer than is written on the label, that is an unregulated power supply and it will read higher when it's unloaded, but when you use it to power something, it should drop down to more around the expected level. Try putting the meter on it when it's plugged into whatever it was designed for.  Unregulated supplies are used either when the target device has a voltage regulator to stabilize it, or when the exact voltage doesn't matter.

Shape D.:


--- Quote from: LordDamo on January 18, 2005, 01:41:32 am ---Is the unit your building going to be like a bartop style thing? I.E. the tv and Jakk's units in the same unit? or is this more of a portible unit that you can take anywhere and plug into a tv?

Really, you dont need the batteries in one of these things. Its better to wire a transformer up to it. It will save you money (no need to buy batteries all the time) as well as the environment (not buying batteries, so you wont be throwing them away).

--- End quote ---
I'm planning on building a portable unit with a removable lid to keep the joysticks from being damaged, and a handle to make it easier to carry around. I haven't figured it all out yet. I just figured If I could run it off batteries when I need to the option for it would be nice.

Jabba:

Ummmm, wouldn't a UPS suffice? It would last for maybe an hour before the bateery dies, but wouldn't a MAME cabinet running off a battery be the same (i.e., would drain the battery quickly?)

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