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Old 01-25-2012, 05:32 PM #1393
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Default Re: DIY Homemade laser diode driver

This forum's got a LOT of good info in it.. all you've got to do to get the answers to nearly any question you have is to look around the stickies and use the search function. Then if you still have questions, post 'em!


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Old 01-25-2012, 05:40 PM #1394
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Default Re: DIY Homemade laser diode driver

still I need to ask about this guide:
Is it only about controlling current? I mean as far as I got it this circuit keeps the voltage constant and lets you control the current. Do I only need to control current in order to control the laser power output? doesnt the voltage affect this too?
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Old 01-25-2012, 05:43 PM #1395
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Default Re: DIY Homemade laser diode driver

hm, i dont know how should i connect 2 2ohm rezistors in parallel. Could you PM me a painted photo? pretty please :3

*EDIT* - so if i would put 2 10 ohm rezistors like this
...........+
|| ||
''''''''''''''''''-
i would get like a 5ohm rezistor?
and how much R rezistors i should use?
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Old 01-25-2012, 05:50 PM #1396
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by nikola tesla View Post
still I need to ask about this guide:
Is it only about controlling current? I mean as far as I got it this circuit keeps the voltage constant and lets you control the current. Do I only need to control current in order to control the laser power output? doesnt the voltage affect this too?

This circuit configuration is current limiting. The basic circuit was NOT developed by Daedal here, in fact it can be found at the bottom of pg. 19 here in the device datasheet: http://www.ti.com/lit/ds/symlink/lm117.pdf

This configuration limits current, the laser diode sets it's own voltage by acting like a zener diode. Laser diodes are current driven devices, so I is the main parameter that concerns us.
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Old 01-25-2012, 05:50 PM #1397
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by Spyro View Post
hm, i dont know how should i connect 2 2ohm rezistors in parallel. Could you PM me a painted photo? pretty please :3

*EDIT* - so if i would put 2 10 ohm rezistors like this
...........+
|| ||
''''''''''''''''''-
i would get like a 5ohm rezistor?
That's correct!
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Old 01-25-2012, 05:54 PM #1398
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Default Re: DIY Homemade laser diode driver

so i have now a LM317T driver here and 2 10 ohm rezistors! Need a pot a cap and a diode
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Old 01-25-2012, 06:07 PM #1399
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Default Re: DIY Homemade laser diode driver

I found some potentiometers but i can't see anything about ohm.... only how much W, R and K...
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Old 01-25-2012, 06:08 PM #1400
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Default Re: DIY Homemade laser diode driver

R is ohms..
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Old 01-25-2012, 07:35 PM #1401
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Default Re: DIY Homemade laser diode driver

So with the driver from this guide I can basically use any diode and an energysource with any voltage?
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Old 01-25-2012, 08:00 PM #1402
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Default Re: DIY Homemade laser diode driver

Any input voltage up to 40V IIRC, BUT the bigger the difference between the input and output voltage the hotter the LM317 will run.
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Old 01-25-2012, 08:08 PM #1403
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Default Re: DIY Homemade laser diode driver

ok so the closer I stick to the voltage the diode needs the more efficient the whole circuit will be?
thanks for your responses you helped me a lot
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Old 01-25-2012, 08:13 PM #1404
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Default Re: DIY Homemade laser diode driver

Yessir that's correct!

And no problem..
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Old 01-27-2012, 03:33 PM #1405
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Default Re: DIY Homemade laser diode driver

just build one, i actually bought 2 2ohm rezistors but they were 3.8 ohm XD what a luck
works preety well with my led'ed lazor diodes and my leds
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Old 01-27-2012, 06:01 PM #1406
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Default Re: DIY Homemade laser diode driver

So when I want to build one that never exceeds the diodes max in ampere how can I calculate how much ohm the resistors and poti has to have?
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Old 01-27-2012, 07:56 PM #1407
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Default Re: DIY Homemade laser diode driver

"http://www.reuk.co.uk/LM317-Current-Calculator.htm"
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Old 01-27-2012, 08:22 PM #1408
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by nikola tesla View Post
So when I want to build one that never exceeds the diodes max in ampere how can I calculate how much ohm the resistors and poti has to have?
Pot has to have about 100 ohm, your for your rezistor is quite difficult. Divide 1250 with how many amps you need. Example : i need 125mA so 1250:125=10 ohm rezistor.
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