Genesis 3 Battery?

Post by **Skyone** » Sun Dec 04, 2005 3:36 am

I'm making a genesis portable and I need a battery, the 2nd most important thing on the portable. It is for the Genesis 3 and I would greatly appriciate it if anyone knows the battery I need and can point me in that direction.... Please?

Thanks

x24 · Post by **x24** » Sun Dec 04, 2005 10:02 am

The Gen 3 Runs off (I think) approx 5v.. you could probably get away with using 4 rechargeable AAs

daguuy · Post by **daguuy** » Sun Dec 04, 2005 10:52 am

yes, genesis 3 uses a 7805 so 4 AAs would probably work if you bypass it or if you don't bypass it, an RC car battery or anytrhing with 7.2-35v would work. good battery

Post by **Skyone** » Sun Dec 04, 2005 3:23 pm

Thanks! The Genesis 3 Power Supply is rated as an output of 10 volts and .3 amps. Do you think that nothing on the board needs higher than 5v?

daguuy · Post by **daguuy** » Sun Dec 04, 2005 3:48 pm

right, everything is 5v

Post by **Skyone** » Sun Dec 04, 2005 4:21 pm

I just hooked up 4 AA's to the bottom side. Nothing turned on but maybe I put it on the wrong pins.... Does anyone know the positive and negative of the genesis 3 female power input jack?

This is what it shows on the power supply:

negative----> (o <-----positive

And on the bottom side of the board under the power input:

Code: Select all

 ______
|  O  |
|o___o|

Post by **marshallh** » Sun Dec 04, 2005 5:43 pm

Code: Select all

 ______
|  O  |
|o___o|

Top is positive, sides are negative.

The input for a 7805 need at least 7.2v, so you need 6 cells (nicad) or 5 cells (alkaline.)[/code]

daguuy · Post by **daguuy** » Sun Dec 04, 2005 7:37 pm

what i do is just connect it to the out pin of the 7805 (of you use 5v of course)

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Sun Dec 04, 2005 7:58 pm

if you wanna use 4 rechargeables then yeah

Post by **Skyone** » Mon Dec 05, 2005 2:11 am

Wow thanks for the information! I really appriciate it. Do you think it would work with a 9v rechargable battery?

Post by **Sparkfist** » Mon Dec 05, 2005 6:24 am

Yes just be sure to use the 7805 regulator.

Post by **Skyone** » Mon Dec 05, 2005 6:18 pm

So just pass it through the power input? Alright thanks!

Post by **Sparkfist** » Mon Dec 05, 2005 6:28 pm

You will find a IC that is under a heatsink it has 3 pins on it. If you go with 7.2v or more you need to have the power go to the IC. If your going to try 4.8v you can either remove the IC and solder the power in there. Third no one has mentioned is that you can remove the IC completely and replace it with a LDO (Low Drop Out) this will generation less heat and can take 6v input.

I hope this clears things up.

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Mon Dec 05, 2005 6:40 pm

ok little lesson on the 7805 here

a 7805 is a voltage regulator in most older systems that lowers any voltage from 32 down to 5. it has three pins.
the first pin is input, input voltage here of course.
the second pin is ground, connect the batteries ground here.
the third pin all the way on the right of the 7805 is output, here is were 5 volts are put out.
you must input at least 7.2 volts for it to work correctly
you must use a heatsink attached to the back of the 7805 in order for it to not overheat

daguuy · Post by **daguuy** » Mon Dec 05, 2005 7:19 pm

actually, genesis 3 doesn't have much of a heatsink on the 7805 (just a little metal plate under it). here's a visual aid