lm317 help

vskid · Post by **vskid** » Sat Apr 08, 2006 7:48 am

Yesterday I got my stuff from radioshack, and I can't figure out how to get 3.3v from the lm317. I've used the calculator, so I know the resistor values, I just can't wire it up right. Could someone make a diagram of exactly what it should look like, I can't understand schematics that well.

timmeh87 · Post by **timmeh87** » Sat Apr 08, 2006 9:54 am

http://benwiki.gptheatre.co.uk/index.ph ... =N64_LM317

i made this. if anyone else wants to add to that, add to it by editing the wiki.

vskid · Post by **vskid** » Sat Apr 08, 2006 10:40 am

Does it have to have a load hooked up? If so, then thats my problem, I just hooked my multimeter to it and it said 6-7v. By diagram I ment a picture or something or what it should look like when done. I wanted to check if I was reading the schematic right.

Can desoldering braid be reused? I was wondering how stingy I should be with it.

How do I know if my battery is charged all the way?

Are you getting tired of all these question? I sure am?

timmeh87 · Post by **timmeh87** » Sat Apr 08, 2006 10:50 am

i use braid until it dosent suck up more solder. you know. whatever. try to use it and if it dosent work then use new stuff.

yeah i think it does need a bit of a load. so put a load on it. like an led or something. dont test it on your n64.

the schematic shouldnt be that hard to understand. but maybe skyone will make you one of his pretty pictures.

your battery is fully charged when your charger stops charging it. dont try to hook it up directly to an ac adapter or something like that.

vskid · Post by **vskid** » Sat Apr 08, 2006 10:57 am

What if I don't have a charger or enough money to by one? When I took it out of the package the battery was 7.77v, so could I hook it up to a 7.5v ac adapter? I'll try adding a load, and I kind of figured out on my own that testing it on the N64 wouldn't be a good idea, I want to keep my fried N64 list at zero.

It will help other people that don't have common electrical sense.

vskid · Post by **vskid** » Sat Apr 08, 2006 11:36 am

It works! All it needed was a load and now it works. I'll try it on the N64 soon.

timmeh87 · Post by **timmeh87** » Sat Apr 08, 2006 12:05 pm

when you got your battery it wasnt fully charged. a 7.2 volt battery is about 7.9 or 8.0v when fully charged (this is just an estimation i made right now..).

you shouldnt hook your batteries up to anything without knowing what current is going into them. (or that its a proper battery charger). a wall adapter might work. it also might make your batteries explode if you just connect it directly to them (especially if it outputs AC)

because of the flatness of nimh discharge a 7.5v power source might charge them to within 90% of full... i dont really know.

why cant you just buy a charger? its like $20. cant you ask your parents for money? get a job? rob a hobo...

Weebl · Post by **Weebl** » Sat Apr 08, 2006 12:09 pm

Is it just me or is the Benheck Wiki not working currently? The reason I'm asking is because I'd like to take a look at your diagram you mentioned in this thread.

timmeh87 · Post by **timmeh87** » Sat Apr 08, 2006 12:52 pm

yeah. sam likes to mess around with it and make it not work

. he does it "at night" but he lives in england so it dosent work during the day over here...

vskid · Post by **vskid** » Sat Apr 08, 2006 12:55 pm

So could I just use a voltmeter and make sure its at 8v every time I charge? I don't have $20 now, but I might be able to get it in a couple weeks, so for now I need some other way.
@weebl- it works for me, the diagram is missing though

PS: If you want a lot of green and yellow leds, hubs have a lot

jeroen · Post by **jeroen** » Sat Apr 08, 2006 1:10 pm

It's working again exept for the forum.

vskid · Post by **vskid** » Sun Apr 09, 2006 9:36 am

Wherre would be the best/cheapest place to get a charger? The only one radioshack has that is just the charger for 7.2v is $40!

vb_master · Post by **vb_master** » Sun Apr 09, 2006 9:43 am

vskid wrote:Wherre would be the best/cheapest place to get a charger? The only one radioshack has that is just the charger for 7.2v is $40!

Use Froogle.

vskid · Post by **vskid** » Sun Apr 09, 2006 10:29 am

I was thinking more toward retail store, but I'll see if I can find anything on froogle.

vskid · Post by **vskid** » Sun Apr 09, 2006 10:35 am

https://www.batteryspace.com/index.asp? ... ProdID=190
According to that page, I could use a 12v charger, just use that equation and change the 300 to whatever the mah output is for the adapter. Am I correct? (I found this on froogle vb)