Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

808nm 300mw test load

strik3

0
Joined
Apr 18, 2011
Messages
145
Points
0
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
 





Machro

0
Joined
Nov 14, 2010
Messages
208
Points
18
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 :D
 

anselm

0
Joined
Nov 22, 2010
Messages
2,448
Points
0
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.
 
Joined
Apr 4, 2011
Messages
596
Points
28
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?
 
Joined
Sep 20, 2008
Messages
17,622
Points
113
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
 
Last edited:
Joined
Apr 4, 2011
Messages
596
Points
28
ahhh it just clicked. I kinda understood that before, but I got it now. Thanks!

Sorry for bringing back a dead thread!
 

Fiddy

0
Joined
May 22, 2011
Messages
2,726
Points
63
TestLoad780nm-808nm-980nm.png
 




Top