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Old 05-07-2011, 04:41 PM #1
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Default 808nm 300mw test load

I was wondering what I would need to create a test load for a 300mw 808nm diode.

From what iv read I have come to believe that 3 1n4004 diodes and a 1ohm 1/2watt resistor are all I would require for an 808nm

Could pleas get someone to confirm this b4 I go ahead attempt this.

Thanks


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Old 05-10-2011, 05:16 PM #2
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Default Re: 808nm 300mw test load

Quote:
Originally Posted by wannaburn View Post
You have to match the voltage of the diode you are going to use.. In this case
an 808 is around 2.2v.

Because its a low current you can use 3 x 1N4001 diodes in series with a
1ohm resistor.

All you need then is a multi meter to measure your current..

Already asked this can confirm it by wannaburn..
Also planning a 808nm build
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Old 05-10-2011, 06:24 PM #3
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Default Re: 808nm 300mw test load

Thanks for the confirmation
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Old 05-10-2011, 06:28 PM #4
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Default Re: 808nm 300mw test load

Quote:
I have come to believe that 3 1n4004 diodes and a 1ohm 1/2watt resistor are all I would require for an 808nm
While I can't confirm this through experience, I see no reason why this wouldn't work as supposed.

If you are using a linear driver it doesn't even matter that much how much voltage
the testload drops exactly...

Switching drivers are different though.
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Old 07-07-2011, 05:42 PM #5
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Default Re: 808nm 300mw test load

Would the same test load be valid if you were setting up the driver to use more amps? say... 10Amps for a nice number. Would you need to use more diodes to imitate the current draw? or still just simulate the voltage drop?
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Old 07-07-2011, 06:25 PM #6
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Default Re: 808nm 300mw test load

Quote:
Originally Posted by dethlore View Post
Would the same test load be valid if you were setting up the driver to use more amps? say... 10Amps for a nice number. Would you need to use more diodes to imitate the current draw? or still just simulate the voltage drop?
First the lowly 1N400X rectifier diode can only handle
1 Amp Max... at 10 Amps they would no doubt glow
before disintegrating...

The Rectifier diodes are there to mimic the Voltage drop
across a Laser Diode...
They do not regulate the current.. The driver does that...

Jerry
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Old 07-07-2011, 07:47 PM #7
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Default Re: 808nm 300mw test load

ahhh it just clicked. I kinda understood that before, but I got it now. Thanks!

Sorry for bringing back a dead thread!
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Old 07-10-2011, 07:20 AM #8
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Default Re: 808nm 300mw test load

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