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Old 04-24-2009, 04:31 AM #1
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Default WTB: 0-700ma+ driver closed found one

im looking to buy a ddl driver that can go up to 700ma if passable pm me if anyone can make one thanks

closed thanks for the help


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Old 04-24-2009, 07:22 AM #2
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Default Re: WTB: 0-700ma+ driver

Per ohms law, using an LM317 circuit, you would need a 1 watt resistor to go to 700 or 800mA's. (1.25 X .800mA = 1watt)

A 2 ohm 1 watt resistor would give you about 625mA's.
http://search.digikey.com/scripts/Dk...name=CF12JR-ND

If you want it adjustable, you will need to use a 1 watt pot.

I have some nice small pots, but they are 1/2 watt. They are 100 ohm 4 turn pots that make a nice DDL driver with a range from 12.5mA's to 400mA's.

Here's a 25 turn 1 watt pot that will work for you!
http://search.digikey.com/scripts/Dk...e=3250W-201-ND

It is 200ohms, which means at the most resistance, you will have 6.25mA's. With 25 turns, you will have very nice adjustment. It should be used at 800mA's max in a DDL driver. I'm sure the adjustment will become more and more touchy as the current gets higher. But the adjustment should be very nice!

Only problem is, the pot alone would cost over $20 bucks after shipping and stuff... (Digikey charges a $5 dollar processing fee for small orders)
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Old 04-24-2009, 12:17 PM #3
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Default Re: WTB: 0-700ma+ driver

yea thats why i barley order from there : well if any one has the parts or can order them ill pay for it to be built 8-)
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Old 04-24-2009, 09:52 PM #4
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Default Re: WTB: 0-700ma+ driver closed found one

I have all parts except the pot...

If I were to build it for you, I would rather build it into a host, such as the 3405, like I did for daguin's 8X shown here:
http://laserpointerforums.com/laser_...790&page=5#113

I would charge:

* Host/heatsink combo - $38
* Custom driver installed with lead wires out the front as shown in Dave's 8X thread linked above - $50 (it is this price, because the pot alone is $20)
* Shipping - $6

Total - $94

Then you would use 3 X 10440 batteries for the supply. (not included)
Jay
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Old 04-24-2009, 10:24 PM #5
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Default Re: WTB: 0-700ma+ driver closed found one

sorry jay this will never fit in a host ;D ill find the link and post it here
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Old 04-24-2009, 10:25 PM #6
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Default Re: WTB: 0-700ma+ driver closed found one

this is what i need it for 8-)


http://www.laserpointerforums.com/fo...num=1239484006
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Old 04-24-2009, 10:31 PM #7
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Default Re: WTB: 0-700ma+ driver closed found one

Ahh... I see said the blind man.

Cool!

Show that baby when you get it going!
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Old 04-24-2009, 10:36 PM #8
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Default Re: WTB: 0-700ma+ driver closed found one

will do.....thanks for the offer though jay
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Old 04-24-2009, 11:28 PM #9
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Default Re: WTB: 0-700ma+ driver closed found one

Quote:
Originally Posted by jake21
0-700ma+ driver closed found one
I'm glad you found one. *If its readily available and not too expensive, I would be interested too (if not a secret)...
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Old 04-25-2009, 03:58 PM #10
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Default Re: WTB: 0-700ma+ driver

Quote:
Per ohms law, using an LM317 circuit, you would need a 1 watt resistor to go to 700 or 800mA's. (1.25 X .800mA = 1watt)
Jay
The correct formula for Power is I x I x R (current squared times resistance)
(1.25 x 0.8 amps x 0.8 amps) = 0.8 watts *(20% less)

I hope this might keep a few builders from using the wrong specifications on components.

Edited- as I misunderstood the original statement, I thought the 1.25 was ohms
* * Sorry Jay

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Old 04-25-2009, 04:08 PM #11
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Default Re: WTB: 0-700ma+ driver closed found one

Well then, I stand corrected! (if your right, I'm not sure I trust what you say) I got my information from Gazoo, and I trust him.

The fact remains, that for this circuit, you will need a 1 watt pot. You cannot buy a .8 watt pot. Not that I know of...

Quote:
Originally Posted by LarryDFW
Inaccurate info from jayrob ... again.

The correct formula for Power is I x I xR
(1.25 x 0.8 amps x 0.8 amps) = 0.8 watts *(20% less)

I hope this might keep a few builders from using the wrong specifications on components.

LarryDFW

I'm not the one trying to say that I have a lens that is more power with red than a Meredith glass lens when I have not even tried a Meredith glass lens!!!

I make a statement that you think I am wrong about, (although I am correct, as shown below), and you say this? I think maybe you have been sniffing too much of that glue that you use to glue your lens assembly's together...
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* FS: New! 1000 Lumen XML-2 Maglite Modification With Voltage Monitor! - Parts or Complete Light! Must see!

* FS: Polished Stainless Steel Green Kit! Easy assembly in minutes!

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Old 04-25-2009, 04:37 PM #12
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Default Re: WTB: 0-700ma+ driver closed found one

Not to stir up any crap... but.... I have always used Volts X Amps = Watts :-/

Here are a few examples.... :

http://ebtx.com/mech/ampvolt.htm

At 1:10 in the video....
http://www.youtube.com/watch?v=SAB4YKfIGQM

http://van.physics.illinois.edu/qa/listing.php?id=2332


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Old 04-25-2009, 04:40 PM #13
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Default Re: WTB: 0-700ma+ driver closed found one

Quote:
Originally Posted by lasersbee
Not to stir up any crap... but.... I have always used Volts X Amps = Watts
Same. :-?
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Old 04-25-2009, 04:42 PM #14
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Default Re: WTB: 0-700ma+ driver closed found one

Jerry;

Your formula is correct.

Resistors have to be large enough to dissipate the power they consume.

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Old 04-25-2009, 04:49 PM #15
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Default Re: WTB: 0-700ma+ driver closed found one

Agreed... isn't that why resistors are rated in watts...

A 1 watt resistor is physically large enough to dissipate 1 Watt of power...
(as far as I know)... I've only been using resistors for about 25 years... ;D ;D

I could be wrong... :


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Old 04-25-2009, 05:00 PM #16
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Default Re: WTB: 0-700ma+ driver closed found one

Quote:
Originally Posted by lasersbee
Not to stir up any crap... but.... I have always used Volts X Amps = Watts :-/

Here are a few examples.... :

http://ebtx.com/mech/ampvolt.htm

At 1:10 in the video....
http://www.youtube.com/watch?v=SAB4YKfIGQM

http://van.physics.illinois.edu/qa/listing.php?id=2332


Jerry


I've always believed the same...

Thus, 1.25 volts at the LM317 sense pins X 800mA's = 1 watt.

But I must say, that I do not claim to know all about electronics. I got this information from Gazoo long ago. And I have always believed that it was accurate information.

But I am all for understanding and correcting my thinking if I have had this wrong all this time.
Jay
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Many DIY 445, red, blu-ray, green, 635, and 450 builds...


Looking for a DIY kit?


Take a look at some of my more popular kits linked in color...

* FS: 405-G-1 Glass Lens Mod for Blu-ray! 31% increase in power vs AixiZ acrylic!

* FS: New! 1000 Lumen XML-2 Maglite Modification With Voltage Monitor! - Parts or Complete Light! Must see!

* FS: Polished Stainless Steel Green Kit! Easy assembly in minutes!

* FS: Large Maglite Monster Kits! Side Button Forward Clicky! Custom Head Option! Gnarly...


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