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Old 01-03-2009, 01:27 AM #1
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Default Dummy load for a greenie?

I will be building a dummy load for red/violet units, and am wondering why there is not one for a green. Is it because the power input is really related to the output of the IR laser and the green output is just a variable sub-power (based on crystal alignment, quality, etc) and you really have to just measure its output with a meter?


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Old 01-03-2009, 10:11 AM #2
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Default Re: Dummy load for a greenie?

The only reason you won't find that info is that, with 1 exception I can think of, green lasers come with drive circuit attached. *
You are right in thinking that the driver is set up to the IR LD so you could try a test load suited to IR LD's..... I have a feeling that you need less than 4 1N4001 diodes for them but have never had to find out.

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Old 01-13-2009, 03:55 AM #3
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Default Re: Dummy load for a greenie?

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Originally Posted by rog8811
I have a feeling that you need less than 4 1N4001 diodes for them but have never had to find out.

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Thanks for the reply, and sorry not to have posted back sooner. *I've been waiting for my replacement LD and an adapter to come in before I dove back into this. *Is there a thread somewhere about the logic behind the dummy load? *Like why for BR you use 6 1N4001's and only 4 for red? *Oh, and if a 5mw Mobolazer 'Lil GBeam isn't on your list of unattached drivers, you can add that one. * Thanks!
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Old 01-15-2009, 08:50 PM #4
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Default Re: Dummy load for a greenie?

Quote:
What is the logic behind the dummy load? Like why for BR you use 6 1N4001's and only 4 for red?
Different colour LD's need a different voltage to drive them, the 1N400 series diodes we use for the dummy load drop .7v each
A red needs around 3v so 4 diodes @ 0.7 = 2,8v
A Blu ray needss around 4.5v so 6 diodes @ 0.7 = 4.2v

This may help with your original question
As I need to test a greenie circuit, the IR LD's usually run @ 2.5v so I will try 3 diodes @ 0.7 = 2.1v


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Old 01-15-2009, 09:35 PM #5
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Default Re: Dummy load for a greenie?

Check your other thread: http://www.laserpointerforums.com/fo...30744297/40#40

I posted an explanation and schematic there if no one has given them to you yet... 8-)
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Old 01-20-2009, 09:16 AM #6
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Default Re: Dummy load for a greenie?

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