bridge rectifier/AC adapter

daguuy · Post by **daguuy** » Wed Aug 17, 2005 7:52 pm

i made a diagram that shows how to include an AC adapter with a different voltage than the battery

but i have 2 Q's:
1. will this work?
2. i've heard something about putting a cap on bridge rectifiers. do i need one and where should i put it?

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Wed Aug 17, 2005 8:10 pm

o my god daguuy you are a freakin genious if this works i hope someone can verify this because i could make my snesp even more kickass before i put it in a case

usbcd36 · Post by **usbcd36** » Wed Aug 17, 2005 8:28 pm

Nice! One question: wouldn't it just be easier to have a DPST switch inside the power jack and use a DC adapter?

daguuy · Post by **daguuy** » Wed Aug 17, 2005 8:33 pm

that would work but this one's better because you can switch between battery and AC adapter without resetting

it just looks a bit more confusing than you might need because i have an AC adapter that has the right voltage and high amps but it's AC so i need to change it to DC

Turbo Tax 1.0 wrote:o my god daguuy you are a freakin genious if this works i hope someone can verify this because i could make my snesp even more kickass before i put it in a case

i'll test it some time soon, probably tomarow

new york cheech · Post by **new york cheech** » Wed Aug 17, 2005 8:43 pm

what are those big black things?

daguuy · Post by **daguuy** » Wed Aug 17, 2005 8:57 pm

they're diode things i found in some old computer PSUs. the diode symbols i put on them show what they do (if you know how to read that stuff and know what diodes do). diodes let electricity go one way but not the other
EDIT: just finished soldering it and the wires are the same colors as in the diagram so it must work

*o* · Post by ***o*** » Thu Aug 18, 2005 12:56 am

nnooo your pics dont work!!!

daguuy · Post by **daguuy** » Thu Aug 18, 2005 1:09 am

i don't know if this will help, but i hosted them on my site. only click the link if the others don't work, it's using my bandwidth
http://www.freewebs.com/daguuy2/imagehosing.htm

*o* · Post by ***o*** » Thu Aug 18, 2005 1:18 am

thats looks good! does it work?

daguuy · Post by **daguuy** » Thu Aug 18, 2005 1:30 am

i'm testing it tomarrow with genesis+screen to see if it'll work with that but i just tested it with a multimeter and it seems to work

daguuy · Post by **daguuy** » Thu Aug 18, 2005 3:05 pm

i'm gonna try it on a genses but before i test it on something that i could break with too much voltage, what voltage would i get if i hooked up battery and AC adapter at the same time? would it average or what?
EDIT: i just tested the AC adapter with a multimeter and it said 9.7v instead of the 9v the adapter said. is there a resistor or something that can lower the voltage by about 1 volt while keeping the high amps?

usbcd36 · Post by **usbcd36** » Fri Aug 19, 2005 6:11 pm

Well, you could try a couple of 7808s wired in parallel.

daguuy · Post by **daguuy** » Fri Aug 19, 2005 8:01 pm

i'm not exactly sure how to use my multimeter so i don't know if this is accurate, but when i tested it with the bridge rectifier i said it was between 8.5-9v, i forgot which, but it's good enough for me

. BTW, school and stuff has been taking more time than i remeber it taking so that's why i haven't tested it on any besides a multimeter yet, i'll see if i can tonight

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Sat Aug 20, 2005 7:11 pm

i got a question will this make it so you can plug in an AC adapter and it will cancel out the batteries

daguuy · Post by **daguuy** » Sat Aug 20, 2005 7:14 pm

i don't know, all i know is it lets you connect both without blowing up the battery