Power requirements for the flasback2

[manuba]

I found a li-ion 7.2v battery for $12 no charger, is it enough to drive the Atari flashback2 and a psone screen?

Or would I have to build a step-up circuit?

Does anyone have a battery to suggest?

[vskid]

The Flashback 2 has a 7805 in it to convert incoming power to 5v. Anywhere from 7-9v should work without modification, anything more will probably require you to heatsink the 7805 or use a different regulator.
The 7.2v from your battery can power the Flashback 2 and PSone screen, but without knowing the capacity of the battery, I can't say how long it could power them.

[manuba]

1800 mAh, But I can do the math for that. I just wasn't sure if 7.2v would be enough to start them, I knew the regulator took care of the step-down.

[manuba]

should I use 2 r/c car batts instead?

[XCVG]

1800mah should be enough with a ledmod.

[Rekarp]

The flashback actually has a 7805 then it goes straight to a 3.3V linear converter. You can pump 3.7V right by the 7805 and be fine.

[XCVG]

Why would it knock the voltage down twice? Is the 5V used for anything?

[Rekarp]

Why would it knock the voltage down twice? Is the 5V used for anything?

Probably cause its cheaper to get a small 3.3V linear voltage converter then a large one. From what I could tell 5V isn't used for anything. Ben said it is used for the sound but 3.7V seems to keep the sound portion happy.

[XCVG]

Crazy Chinese Circuit boards they make no sense to me

I've seen worse.