Search found 312 matches
- Sun Sep 04, 2005 1:58 pm
- Forum: 1990's Gaming
- Topic: bridge rectifier/AC adapter
- Replies: 16
- Views: 4966
actually, if your battery voltage is only 8.4v, and the AC adapter voltage is 9Vrms, then the AC adapter will automatically reverse-bias the diode coming from the battery. So when you plug in the AC adapter, it will prevent any current from flowing from the battery, essentially turning it off. You d...
- Tue Aug 30, 2005 6:46 pm
- Forum: Hacking Videogame Consoles - The Book
- Topic: for all you lithium lovers...
- Replies: 3
- Views: 3443
Li-Ion Charging times = 500 Shelf charge = Very long Price = Kinda pricy. A 7.2V 2000 mah would cost ~$30 Shortest Charging time = About an hour (that's the fastest I have seen them.) Ni-Cad Charging times = 1000 Shelf charge = Not long. Maybe a week. Price = Around $3 a cell. So a 7.2V 2000 Mah ba...
- Tue Aug 30, 2005 11:44 am
- Forum: Hacking Videogame Consoles - The Book
- Topic: for all you lithium lovers...
- Replies: 3
- Views: 3443
for all you lithium lovers...
I was bored, so I decided to do some research about my new lithium batteries. I found this site: http://www.sanyo.com/batteries/pdfs/lionT_E.pdf It describes how they work...but most importantly, how to keep them working at peak levels for as long as possible. I know the most popular version is the ...
- Fri Aug 26, 2005 8:32 pm
- Forum: 1980's Gaming
- Topic: BC639
- Replies: 2
- Views: 1826
- Thu Aug 25, 2005 4:04 pm
- Forum: Hacking Videogame Consoles - The Book
- Topic: batteries
- Replies: 10
- Views: 6444
- Wed Aug 24, 2005 7:16 pm
- Forum: Hacking Videogame Consoles - The Book
- Topic: batteries
- Replies: 10
- Views: 6444
batteries
hey, just thought i'd post this to see if it helps someone out. In the book he stressed the awesomeness of the infolithium batteries. If you go to www.power101.com they sell generic batteries...but hey, it's still 4000mAH for a pretty cheap price!
sorry...fixed the comma in the link
sorry...fixed the comma in the link
- Wed Aug 17, 2005 8:21 am
- Forum: 1980's Gaming
- Topic: NOAC can run well with unregulated current ~5v?
- Replies: 22
- Views: 8726
- Tue Aug 16, 2005 10:02 pm
- Forum: 1980's Gaming
- Topic: NOAC can run well with unregulated current ~5v?
- Replies: 22
- Views: 8726
hopefully those ICs you hate so much will make me a living some day :-) Anyway, I dont like the 7805 personally. LDO regulators are much more efficient, which is defintely what you want in a battery powered situation. If you want to be really efficient, you could use a switching regulator, but we wo...
- Tue Aug 16, 2005 9:50 pm
- Forum: 1980's Gaming
- Topic: NOAC can run well with unregulated current ~5v?
- Replies: 22
- Views: 8726
that would work...but i dare you to try to find 1 and 2 ohm resistors! If you're insistent un using this method, i'd use 10k and 20k ohm. But think of this. When your battery drops to about 6.5 volts, the output to your nintendo will only be 4.3v. Logic high is probably a 4v threshold, so you're bou...
- Tue Aug 16, 2005 9:21 pm
- Forum: 1980's Gaming
- Topic: NOAC can run well with unregulated current ~5v?
- Replies: 22
- Views: 8726
that's understandable...but when your voltage divider voltage drops below whatever the threshold is for the logic family you're using, it won't work anymore. The 7805 will let you play longer than just trying to cut the voltage down. Besides, you would constantly be wasting power in the resistors. I...
- Tue Aug 16, 2005 9:09 pm
- Forum: 1980's Gaming
- Topic: NOAC can run well with unregulated current ~5v?
- Replies: 22
- Views: 8726
no no...a single resistor wont bring it down to 5v, not if you put it in series at least. You need a voltage divider to drop 7.5v to 5v using resistors, if that's the way you want to do it then look it up on google. The best way to produce 5v is defintely with a 7805 regulator. If you use a voltage ...
- Tue Aug 16, 2005 10:39 am
- Forum: 1980's Gaming
- Topic: Video amp
- Replies: 7
- Views: 3062
Hey, i'm a little late in replying, but i just now bothered to register. The video amp can also be done using the 2N3904 NPN transistor that every radio shack carries. Just replace the 33ohm resistor with a 10ohm. The circuit is a current amplifier rather than voltage, so reducing the 33 ohm resisto...