Power requirements for the flasback2

Includes Atari 2600, Nintendo 8-bit, Sega Master System, MSX and more!

Moderator: Moderators

Post Reply
User avatar
manuba
Posts: 116
Joined: Sun Mar 29, 2009 11:34 pm
PSN Username: w33dw4c3r
Steam ID: Truckstop13
Location: The great stinky desert

Power requirements for the flasback2

Post by manuba » Sun May 10, 2009 4:30 pm

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?

User avatar
vskid
Senior Member
Posts: 6314
Joined: Fri Mar 25, 2005 8:25 am
Steam ID: vskid3
Contact:

Re: Power requirements for the flasback2

Post by vskid » Sun May 10, 2009 4:38 pm

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.
Image

User avatar
manuba
Posts: 116
Joined: Sun Mar 29, 2009 11:34 pm
PSN Username: w33dw4c3r
Steam ID: Truckstop13
Location: The great stinky desert

Re: Power requirements for the flasback2

Post by manuba » Sun May 10, 2009 5:55 pm

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.

User avatar
manuba
Posts: 116
Joined: Sun Mar 29, 2009 11:34 pm
PSN Username: w33dw4c3r
Steam ID: Truckstop13
Location: The great stinky desert

Re: Power requirements for the flasback2

Post by manuba » Sun May 10, 2009 7:30 pm

should I use 2 r/c car batts instead?

User avatar
XCVG
Senior Member
Posts: 1947
Joined: Sun Dec 21, 2008 9:10 pm
Location: Canada

Re: Power requirements for the flasback2

Post by XCVG » Sun May 10, 2009 7:54 pm

1800mah should be enough with a ledmod.

User avatar
Rekarp
Portablizer Extraordinaire
Posts: 2163
Joined: Thu Dec 28, 2006 1:52 am
PSN Username: Lnghrn_
Steam ID: rekarp
Location: Austin, Tx
Contact:

Re: Power requirements for the flasback2

Post by Rekarp » Wed May 13, 2009 8:03 pm

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.
The wood master

Image

"I was under the impression Mac owners don't actually USE their machines, they just parade them around trying to evangelize the masses."

User avatar
XCVG
Senior Member
Posts: 1947
Joined: Sun Dec 21, 2008 9:10 pm
Location: Canada

Re: Power requirements for the flasback2

Post by XCVG » Thu May 14, 2009 10:21 am

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

User avatar
Rekarp
Portablizer Extraordinaire
Posts: 2163
Joined: Thu Dec 28, 2006 1:52 am
PSN Username: Lnghrn_
Steam ID: rekarp
Location: Austin, Tx
Contact:

Re: Power requirements for the flasback2

Post by Rekarp » Thu May 14, 2009 10:31 am

XCVG wrote: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.
The wood master

Image

"I was under the impression Mac owners don't actually USE their machines, they just parade them around trying to evangelize the masses."

User avatar
XCVG
Senior Member
Posts: 1947
Joined: Sun Dec 21, 2008 9:10 pm
Location: Canada

Re: Power requirements for the flasback2

Post by XCVG » Mon May 18, 2009 2:49 pm

Hackmodford wrote:Crazy Chinese Circuit boards :roll: they make no sense to me :lol:
I've seen worse. :lol:

Post Reply