Old 09-25-2008, 07:29 PM #49
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Default Re: Testing DDl's circuit

Thanks nvmextc! I said someone would confirm 6 diodes

@ caleb.... There is nothing wrong with using this driver with the blu ray, I just got lazy and used Rkcstr drives

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Old 09-27-2008, 06:04 AM #50
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Default Re: Testing DDl's circuit

is 6 AA's too much?
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Old 09-27-2008, 10:57 AM #51
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Default Re: Testing DDl's circuit

The LM317 will take up to 38v, if I remember correctly, the more volts you put in the better the heatsinking required for the regulator.

6 X 1.5 = 9v, red LD needs 3v, LM317 needs 3v which means that you have an overhead voltage of 3v.
That would work fine and the heat generated by the regulator would never get too high as you will be using the laser with a duty cycle to protect the LD anyway.

You could consider using 6 Ni-cads @ 1.2v each which gets you back to the ideal voltage.

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Old 09-27-2008, 08:46 PM #52
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Default Re: Testing DDl's circuit

and whats a good test load for a red LD?
i hav 2 1n4001, 1 green led and some 10ohm resistors
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Old 09-28-2008, 12:40 AM #53
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Default Re: Testing DDl's circuit

how can i make this driver fixed.
i saw somewhere there was a formula but cant find it.

thanks.
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Old 09-28-2008, 12:41 AM #54
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Default Re: Testing DDl's circuit

A good testload would be 4 of those diodes in series.

The formula was 1.25 / R = I in Amps.
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Old 09-28-2008, 05:07 AM #55
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Default Re: Testing DDl's circuit

can you give me an example.

say i wanted 100ma

thanks

EDIT: i.e. 100ma to the diode.
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Old 09-28-2008, 05:34 AM #56
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Default Re: Testing DDl's circuit

Ohm's law
http://www.the12volt.com/ohm/page2.asp
1.25/12.5 = .100
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Old 09-28-2008, 08:48 PM #57
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Default Re: Testing DDl's circuit

something i noticed in my circuit is that if i put a 10ohm resistor it makes the current very low, like around 1mA
whats wrong>????????????
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Old 09-28-2008, 11:41 PM #58
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Default Re: Testing DDl's circuit

i tried it without a resistor, and it works fine i measured 2.5 volts and 250~Ma
is that bad for laser diode?
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Old 09-29-2008, 05:11 PM #59
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Default Re: Testing DDl's circuit

@ Droyd, Could you put up a photo or a drawing of what you have done? It will help with diagnosing the problem.

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Old 09-30-2008, 12:22 AM #60
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Default Re: Testing DDl's circuit

Picture of circuit with no resistor, it gives out 8 volts this is what I use for my LD
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Old 09-30-2008, 12:25 AM #61
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Default Re: Testing DDl's circuit

Heres with resistor
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Old 09-30-2008, 12:26 AM #62
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Default Re: Testing DDl's circuit

sorry for size, dont know how to fix it :-[
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Old 09-30-2008, 12:31 AM #63
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Default Re: Testing DDl's circuit

Use paint.

You donīt really connected your LD without the resistor??? 8V is WAY to much for any diode....
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Old 09-30-2008, 01:56 AM #64
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Default Re: Testing DDl's circuit

when i hook it up, it measures as 2.3 volts
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