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Old 09-07-2008, 03:20 AM #1
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Default DDL Test Load

Well, I built the test load circuit for the DDL driver using 4 IN4001 diodes and a 1 ohm resistor.
When I test the voltage with my DMM I am getting about 5.6 volts. When I try to measure the
mV across the resistor I don't get a reading at all. Any ideas what I am doing wrong? I have
rechecked all my schematics and near as I can tell the driver and test load are wired correctly.
Interesting thing is, if I connect a plain green LED to the circuit I can adjust the brightness from
very bright to almost off on the LED by turning the pot. I just want to make sure I don't blow my
DVD LD when I connect it to the driver. Any advice would be great.

Thanks


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Old 09-07-2008, 03:33 AM #2
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Default Re: DDL Test Load

Okay, sorry for the premature post. *:

I figured it out. Newb as I am I had all 4 diodes backwards in my test load circuit. [smiley=embarassed.gif]
It is now working correctly and my driver is working great.

Only one question remains. How many mA should I drive my 18x open can LD at?
I don't want to overdrive it as I would like it to last for a while.

Thanks

EDIT: I did some searching and found that it should be safe to run a 16x diode at 150mA.
My diode being an 18x open-can I figured the same would apply to it. I set my driver for 150mA and connected my
diode. It is working great! The question is how much further can I push it without stressing the LD? Can anyone suggest
an optimal current for an 18x diode to provide good power and long life?
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Old 09-07-2008, 07:12 AM #3
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Default Re: DDL Test Load

I'm thinking 250mA, up to 300mA......................
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Old 09-07-2008, 01:08 PM #4
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Default Re: DDL Test Load

Cool! Thanks!
I might try going up gradually just to see the difference from 150mA
to 200mA then maybe 250mA. Now I need to look for a conversion
formula/chart to see how many mW it is puting out. ;D
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Old 09-07-2008, 10:20 PM #5
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Default Re: DDL Test Load

Here you go!
http://www.laserpointerforums.com/fo...num=1210649510
Jay
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Old 09-07-2008, 10:43 PM #6
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Default Re: DDL Test Load

Hey, thanks a bunch for the link. That helps alot!

Now I just need to get a new battery box to power
my laser. I was using a 4-AA box with alkaline batteries,
then I read that they drop off quickly and can actually cause
a spike that kills the diode. Is this right? Now I am afraid to
use the alkaline batteries. I have 6 NiMH AAs but I just need
to get a battery holder for them. Guess my project is on hold
until I get in to Radio Shack.
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Old 09-08-2008, 03:36 AM #7
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Default Re: DDL Test Load

Okay, I got my battery box all set up. I am running 6 1.2V NiMH AA batteries.
I connected my test load circuit to my DDL driver and set the current to 200mA.
At that current I am reading 3.3V. Is that voltage too high? I really don't want to
blow my diode.

The interesting thing is that when I first hit my switch I get about 3.5V and it gradually
settles down to 3.3V constant. I checked the reference voltage on my LM317T and it is
1.23V. I also checked the voltage coming off my batteries and I am getting 8.0V so that
may be where I am getting the higher voltage to the test load. Also my LM317T seems to
be getting quite warm, granted I left the circuit on for awhile. Should it be getting warm at
all taking 8V?
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