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Old 08-05-2009, 07:39 PM #1
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Default Test Load Verification

I have recently finished my laser test load for red lasers.

I just wanted to verify that I build it correctly.

The top side: 4 1N40001 diodes in a line on a breadboard, then 1 lead from the last diode to a 10 ohm resistor.I have leads from the resistor and from the diodes to connect them to the driver.

The bottom side: The pins of diodes that are next to each other are soldered together.Thats it.

I really want to know if this will work.I will post a youtube video about it when I get back from vacation.

Thanks,
Logan


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Old 08-05-2009, 08:54 PM #2
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Default Re: Test Load Verification

Umm.... i believe you are suppose to use a 1 ohm resistor, at least that what i have on mine and from what i remember reading when i built it sometime ago.

A quick check, and yes, its a 1 ohm resistor. Lasersbee has a tread where hes giving away 1 ohm 1/2W resistors for the price of shipping. The test load for reds should be four diodes and the resistor all in parallel, and the current measurment taken across the resistor

I've attached a photo of what it should look like. This photo is property of ROG8811, i may no claim that is mine( i'd be rather foolish to do so as his name is in the pic)
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Test Load Verification-test-20load01.jpg  
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Old 08-05-2009, 09:16 PM #3
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Default Re: Test Load Verification

gryphon is correct. it is a 1 ohm resistor. i don't use a bread board. i just solder end to end and bend into a U. the striped end of the diode will connect to the resistor and the resistor goes to the negative output of the test load. and the other end of the dummy load to the positive output.
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Old 08-06-2009, 01:39 AM #4
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Default Re: Test Load Verification

You are all correct.... but as long as the Anodes of the diodes
(the end opposite of the band) face the Positive lead of the
Driver... it doesn't really matter which end of the Diode string
you place the 1 Ohm resistor...

BTW... here is the link to the FREE 1 Ohm 1/2 Watt Resistors...

http://laserpointerforums.com/f39/fr...ors-42409.html


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Old 08-06-2009, 02:19 AM #5
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Default Re: Test Load Verification

Is it possible to use any diodes as long as the correct voltage drop is achieved?
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Old 08-06-2009, 02:59 AM #6
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Default Re: Test Load Verification

Quote:
Originally Posted by potatorage View Post
Is it possible to use any diodes as long as the correct voltage drop is achieved?

Yes. (posted with less than 5 words >.> )

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Old 08-06-2009, 09:33 AM #7
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Default Re: Test Load Verification

Quote:
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Yes. (posted with less than 5 words >.> )

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Old 08-06-2009, 11:44 AM #8
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Default Re: Test Load Verification

Quote:
Originally Posted by Momo66342 View Post

The top side: 4 1N40001 diodes in a line on a breadboard, then 1 lead from the last diode to a 10 ohm resistor.I have leads from the resistor and from the diodes to connect them to the driver.

i think is ok to use 10ohm resistor but with 10ohm resistor when you read the current to the DMM 1mv equals with 10mA.
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Old 08-06-2009, 11:52 AM #9
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Default Re: Test Load Verification

The problem is, your voltage drop will be 10x as great as with a 1 Ohm resistor. This means, using the standard 4x1N400x for red and 6x1N400x for BR, you wouldn't be able to set the usual currents of 420mA for an LPC or 120mA for a PHR diode using a FlexDrive, as the output voltage would have to be at or above 6V.

Oh btw, it's the other way round: 10mV would mean 1mA.
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Old 08-07-2009, 08:18 PM #10
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Default Re: Test Load Verification

Quote:
Originally Posted by Gryphon View Post
Umm.... i believe you are suppose to use a 1 ohm resistor, at least that what i have on mine and from what i remember reading when i built it sometime ago.

A quick check, and yes, its a 1 ohm resistor. Lasersbee has a tread where hes giving away 1 ohm 1/2W resistors for the price of shipping. The test load for reds should be four diodes and the resistor all in parallel, and the current measurment taken across the resistor

I've attached a photo of what it should look like. This photo is property of ROG8811, i may no claim that is mine( i'd be rather foolish to do so as his name is in the pic)
Isn't it in series, not parallel?

That's what the image shows
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Old 08-07-2009, 08:58 PM #11
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Default Re: Test Load Verification

Quite correct.
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Old 08-10-2009, 04:05 AM #12
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Default Re: Test Load Verification

Ok.This means i get to build another testload.
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