required SJ3 voltage?

Dr.Weasel · Post by **Dr.Weasel** » Sun Feb 12, 2006 11:50 pm

Well i'm very confused! I just opened my second SJ3 and it doesnt have a voltage reg. anywhere. "The first SJ i opened had a 7805" So it has a unregulated power source going in. Second of all, i just tryed to run it on
4 x AA batteries and it wouldnt power up. checked the voltage on the batteries and it was 6 volts as it should be. So i checked it on the wall adapter and it worked just fine. Then i checked the voltage on the wall adapter and it was outputting 16 volts. "it says 9 on it". so my question is, am i just missing the voltage regulator on this thing or is it actually running off of 16volts?

Also, How many people out there have opened up there noac to find a little switch that enables carts?... well i found on in the SJ3 and was just wondering how common this is?.
-Hayden

akadewboy · Post by **akadewboy** » Mon Feb 13, 2006 6:09 am

Big resistors can knock down voltage, is there some anywhere on the board?

loup · Post by **loup** » Mon Feb 13, 2006 11:47 am

I've had two with built in games, both had the switch for the carts. I think pretty much all of the newer ones have it.

One of my super joys didn't have a power regulator on it either, it just appeared to have a fairly large resistor on it. It also had a spot for batteries, putting 4xAA batteries in it powered it just fine from there.

[edit]
One quick note, don't trust any voltages that are written on the thing anywhere, mine also said 9vdc, but when measured it was closer to 16vdc and I would also double check anything written on it. On one of my NOACs the silkscreening actually had a couple things mislabeled, one of them being the directions on the controller. it was a little odd pushing down to go up

Post by **gannon** » Mon Feb 13, 2006 2:31 pm

a lot of them use a 5.6V zener diode, a transistor, and a resistor as a voltage regulator.

Dr.Weasel · Post by **Dr.Weasel** » Tue Feb 14, 2006 12:37 am

gannon... i just want you to know that your one of the smartest people i know. I feel dumb whenever you speak.
-Hayden.
"o yeah this one is the zenner diode, i didnt know it was a diode though. i just thought it was a goofy resister"

Post by **Gamelver** » Tue Feb 14, 2006 4:12 pm

gannon wrote:a lot of them use a 5.6V zener diode, a transistor, and a resistor as a voltage regulator.

and another .7V diode to get 4.9V

. I built the same circuit over the summer, for my Intro to Electronics/Computer engineering

.