God i hate drivers. Can i do this instead?

• Feb 25, 2011

• #33

midias

0

Joined

Mar 14, 2010

Messages

631

Points

0

I hope this helps

 

• Feb 25, 2011

• #34

Leodahsan

0

Joined

Aug 7, 2010

Messages

2,086

Points

0

everyone is posting something so I'll post too.

http://www.national.com/ds/LM/LM317.pdf

Have a read and understand how it works, it will help you. Just don't wire it like a 'constant voltage regulator', as the example says. Wire it like midias said.


edit:
midias
Posts: 317

hmmm...

 

Last edited: Feb 25, 2011

• Feb 25, 2011

• #35

L

Lascannon

0

Joined

Feb 17, 2011

Messages

167

Points

0

thank God for this forum. hahaha. thanks midias.

 

• Feb 25, 2011

• #36

midias

0

Joined

Mar 14, 2010

Messages

631

Points

0

Lascannon said:

thank God for this forum. hahaha. thanks midias.

Click to expand...

No prob just post if you have more questions I can always draw another picture

 

• Feb 25, 2011

• #37

E

elite ares

0

Joined

Oct 20, 2010

Messages

301

Points

0

Not to be nitpicking, but where's the switch? I've been following this thread because I want to build a driver and am in the process of gathering materials.

 

• Feb 25, 2011

• #38

Leodahsan

0

Joined

Aug 7, 2010

Messages

2,086

Points

0

Just wire one between the vIn and the battery positive.. :thinking:

 

• Feb 25, 2011

• #39

L

Lascannon

0

Joined

Feb 17, 2011

Messages

167

Points

0

So i have the materials to redo this whole thing, I think im just going to start over. What size cap should i use?

 

• Feb 25, 2011

• #40

Leodahsan

0

Joined

Aug 7, 2010

Messages

2,086

Points

0

You should search some info in the forum rather than asking
some say 10uF >12v is enough.

 

• Feb 25, 2011

• #41

L

Lascannon

0

Joined

Feb 17, 2011

Messages

167

Points

0

Can anyone think of another item that has a driver in it that i could steal on out of?

 

• Feb 25, 2011

• #42

midias

0

Joined

Mar 14, 2010

Messages

631

Points

0

Lascannon said:

Can anyone think of another item that has a driver in it that i could steal on out of?

Click to expand...

for 445 diodes you can steal from LED flashlights. I could send you a LM317 driver if you want I found one in my car recently I can just swap the resistor for 390ma like yours and you can study it.

 

• Feb 25, 2011

• #43

L

Lascannon

0

Joined

Feb 17, 2011

Messages

167

Points

0

ALso, what volts will be coming out of the lm317 chip?

 

• Feb 25, 2011

• #44

Leodahsan

0

Joined

Aug 7, 2010

Messages

2,086

Points

0

If it is configured like you saw on the diagrams (constant current) he will be outputing how much your diode needs.

 

• Feb 25, 2011

• #45

midias

0

Joined

Mar 14, 2010

Messages

631

Points

0

Lascannon said:

ALso, what volts will be coming out of the lm317 chip?

Click to expand...

It will vary depending on current draw of the diode I would expect around 2-3 for red and 4-5 for blue and purple

 

• Feb 25, 2011

• #46

L

Lascannon

0

Joined

Feb 17, 2011

Messages

167

Points

0

No thanks, i think id like to get this one on my own. What does a 445 diode do?

This is absurd. I have an lm317, a 1 ohm and a 2.2 ohm resisitor, a selection of capacitors, a diode, and some special bats. So why is this so hard to do?

 

• Feb 25, 2011

• #47

L

Lascannon

0

Joined

Feb 17, 2011

Messages

167

Points

0

So why cant i just put two AA bateries on it and then wire a cap in paralel and put 8 ohms resistence to manage the current?

 

• Feb 25, 2011

• #48

Leodahsan

0

Joined

Aug 7, 2010

Messages

2,086

Points

0

Lascannon said:

So why cant i just put two AA bateries on it and then wire a cap in paralel and put 8 ohms resistence to manage the current?

Click to expand...

You can. You just should not. When the diode heats or get old, he starts draining more current and will blow up...

YOU NEED a constant current source, like the LM317, the rckstr driver, the Jib driver, the Dr. Lava drivers, etc.