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Old 03-21-2011, 07:26 PM #17
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Default Re: Driver build problems

Your driver should look like this:

Ignore some of the values because I got this from Daedal's post

In your schematic it looks like your using (2) 1 ohm resistors in parallel, which doesn't give you the 10 ohms you need. (2) 1 ohm resistors in parallel will give you .5 ohms. You only need (1) 10 ohm resistor (buy them at radioshack).

The reason for this is because the resistors after the pot sets the limit for the current. I think you included the 100 ohm pot resistor in your calculations. It's just to adjust the current so it's neglible in your calculations.

Put the test load where the laser diode would be and measure the current on the test load resistor.

If this doesn't help here is a website I think will help you better: *Laser driver - It can be done*


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Old 03-21-2011, 08:23 PM #18
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Default Re: Driver build problems

Quote:
The reason for this is because the resistors after the pot sets the limit for the current. I think you included the 100 ohm pot resistor in your calculations. It's just to adjust the current so it's neglible in your calculations.
(My bolding)
"Just to adjust the current" "Negligible"
What have you been smoking?

ETA:
Oops, I overlooked the pot in resistor.
Yes, you can ignore the pot when calculating max current, and include it for minimum current.
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Old 03-21-2011, 09:11 PM #19
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Default Re: Driver build problems

I need around 1.5 ohms to get the 800mA that i want at the end 10 ohms is gonna give me around 125mA i realize that's how its supposed to be and that's how i had it i just wasn't getting what i was supposed to on my output current wise. Looking into how the LM317 works it needs an amperage of over 1A on the power supply. my batteries since they are about dead are giving me 7V but only about 10mA so i'm thinking that's the issue. stupid me didn't get a battery charger when i got the batteries so i have to wait for one to get shipped. luckily i found a nice charger for a good price that will work with my batteries and it comes with two 18650's so hopefully this fixes the issue i'm having.

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Old 03-22-2011, 12:10 AM #20
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Default Re: Driver build problems

You don't need 1A to power the LM317. What it probably meant on the data sheet is it is limited to 1A current draw, but usually are capable of 1.5A. Working voltage for the LM317 is around 3V.

Remember, any unused voltage by the LM317 will be dissipated into heat.
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Old 03-22-2011, 12:22 AM #21
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Default Re: Driver build problems

BennyF You appear to be having trouble understanding how the LM317 circuit works. Please use the links below to help calculate the resistance You require.

LM317 Current Calculator - Electric Circuit
LM317 / LM338 / LM350 Voltage and Current Regulator Calculators
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Old 03-22-2011, 01:10 AM #22
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Default Re: Driver build problems

I have my driver set up like the links you showed me. I'm looking to gain around 800mA so i have a 1.5 ohm series parallel resistor cluster attached between the adj and the Vout. i only get around 50mV on the 1 ohm resistor on my load bank. i understand how this circuit works its just not working. if you look at the data sheet for the LM317 it will show you that the input current should but >(greater than)1A hence why i have to get a charger to charge my batteries. If that doesn't fix my problem i have no clue what I'm doing wrong then.
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Old 03-22-2011, 04:25 AM #23
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Default Re: Driver build problems

What are the resistor values you are using in order to get the 1.5 ohms?
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445nm 1566 mA A140 SIPIK HK21 (G2 Drive) - link
473nm B&W Tek BWB-10-OEM - 10mW
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Old 03-22-2011, 04:46 AM #24
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Default Re: Driver build problems

BennyF:

Here is a simple parallel resistor calculator. Just plug in your values, and see the results.

PARALLEL RESISTOR CALCULATOR
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Old 03-22-2011, 01:21 PM #25
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Default Re: Driver build problems

BennyF - your last post about not enough current in is correct! Recharge your batt.s, set up like Toke has described and you should be O.K. Make sure that your 1 Ohm in the test load is actually 1 Ohm, otherwise you will have to recalculate current out from your meter reading. Good luck, stay with it, and listen to Toke.
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Old 03-27-2011, 04:53 PM #26
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Default Re: Driver build problems

ok so i have my driver set up with a 1.5 ohm resister (3x1 ohms in series parallel) and i finally got my 18650's in the mail with the charger. whats promising is with about half charge they give me about 500mA so this looks like the problem is fixed. but now there is another i have now clue how im gonna arrange 2 18650's in a host..LOL. i didn't realize how big they were i just kinda figured they were the size of AA's. but at least my circuit should work.
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Old 03-27-2011, 05:53 PM #27
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Default Re: Driver build problems

Good to hear.


There are AA sized ones, called 14500, the AAA's are 10440.

The lithium battery numbers parse as: diameter-lenght-shape.
In this case 14mm in diameter, 50mm long, and a 0 for cylindrical.
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Old 03-27-2011, 08:24 PM #28
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Default Re: Driver build problems



Thar' she blows!
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Old 03-28-2011, 03:43 PM #29
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Default Re: Driver build problems

well its done and i'm dubbing it the "Black Mamba". sitting right around 1W. it is currently in a temporary case until i can find a host or can build a case that i like. i will post pictures later, not only because i don't have my camera but because my batteries died from playing with it to much.
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Old 03-28-2011, 04:55 PM #30
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Default Re: Driver build problems

Congrats Benny! I feel your pain....
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Old 03-29-2011, 12:45 AM #31
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Default Re: Driver build problems

Now remember this is only a temporary housing for the laser, so don't be so harsh.




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Old 03-29-2011, 03:51 PM #32
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Default Re: Driver build problems

Hehe, nice!
Is that a custom jayrob 405-G1 lens? Judging from the spot's appearance.
Also, looks like you'd be better off with more heatsinking than what looks just an Aixiz module.
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