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05-02-2010, 11:18 PM #17
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harryd
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Re: plz help !!!

dude, i seriously cant thank you enough . u are like my idol right now. THANK YOU

i am using 2 x10 ohm( giving only 5 ohm in total ) as a fixed resistance... should i just change the 2x10 with one 27 ?

ok just going over the steps:
1- disconnect the dummy circuit
2- connect both wires together 3 times to discharge
3- connect the laser diode
4- set the resistance at( 1.25/30ma( the operating current)=41 ohm and we have a fixed 27 ohm so )41-27= 14 ohm. set the resistance at 14 ohm
5- connect the voltage supply and make it 9 v

**** the laser diode should emit red laser*****
6-then gradually decrease the resistance till it hits zero

05-03-2010, 02:02 AM #18
 Class 4 Laser Join Date: Sep 2008 Location: Quebec, Canada Posts: 14,823 Rep Power: 477
lasersbee
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Re: plz help !!!

NO.....
Always start at the lowest current and work your way up...

Use the Test Load to make sure the driver can give you the
Max and Min currents as I outlined above...
If your driver can do that... then.... and only then...

1) set your driver to minimum
2) disconnect power to your Driver
4) discharge the output capacitor
5) connect your Laser Diode to your Driver
6) put power on your driver
7) slowly increase the current until you get lasing..

BTW when you say you are using 2 x10 ohm resistors to give 5 ohms...
you need to tell us if you put them in parallel or series...
We can not see what you did... only you can see what you did..
You may think you have 5 Ohms when in fact you have 20 ohms
because you put them in series.... we just don't know... because
the small detail of series/parallel is missing...

Jerry
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05-03-2010, 09:39 AM #19
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harryd
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Re: plz help !!!

Quote:

when u said pins 1 and 2.... i think u meant 1 and 3 right ? and 1 is the negative and 3 is the positive right ?

05-03-2010, 12:00 PM #20
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harryd
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Re: plz help !!!

oh nvm u were right. 1 and 2

i connected everything and i checked that the diode will see 30 ma then i discharged and everything and i connected the diode but it didn't work.

ofc if it is doesnt work this means it is burned right ?

05-03-2010, 01:36 PM #21
 Class 4 Laser Join Date: Sep 2008 Location: Quebec, Canada Posts: 14,823 Rep Power: 477
lasersbee
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Re: plz help !!!

Quote:
 Originally Posted by harryd when u said pins 1 and 2.... i think u meant 1 and 3 right ? and 1 is the negative and 3 is the positive right ?

NO.... (1) is the Positive and (2) is the Negative...
The info is clearly shown on the Spec Sheet....

BTW.... LD = Laser Diode... PD = Photo Diode

Jerry
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Last edited by lasersbee; 05-03-2010 at 01:38 PM.

05-03-2010, 01:48 PM #22
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harryd
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Re: plz help !!!

yes yes i did that.. dont worry but still it didnt work.

i honestly dont know what is wrong. i connected the tes load , measure the mv acroos the 1 ohm resistor and it was at first 26mv. i discharged and everything then i connected the laser diode but nothing worked, i tried to increase the current slowly, still nothing.

and how i can tell if the laser diode is burned

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