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Max volts into red diode?

Fiddy

Fiddy

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Ive been using 3 diodes to set my currents for reds for a long time, at close to full load current the forward voltage drop of the diode(s) increase.
 
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superh90x

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okay, sorry for the wait

ignore the green wire, I didn't realize I didn't need it and haven't removed it yet
 

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Fiddy

Fiddy

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looks alright, wheres that green wire going?
 
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superh90x

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nowhere at all, I have a socket that the laser diode will connect to, and I soldered it then thought, and realized it would go to the not used pin, so its just sitting right now waiting for removal or trimming
 
Fiddy

Fiddy

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Looks alright, you may have damaged it with 9V's tho, do you have a spare or tried three diodes on the test load.
 
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superh90x

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I thought it was messed up before the 9, but no I haven't tried my spare, or the three diodes, with it being 4am I don't feel like soldering would be wise
 
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superh90x

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I should, but i'm an insomniac, its not my tiredness preventing me from work, its the fact I live with people still and they'll get angry if I do that again. random question: what time is it where you're at?
 
T

Terabyte2007

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Fiddy said:
3.7V is too high for a red diode, red diodes like to live from 2.5 -3.0V, if your measuring 3.7V across the diode it should be dead.
Click to expand...

I have killed Red diodes at 3.0 volts before, even with a well regulated current supply!
 
Kookapeli

Kookapeli

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If you're using a linear driver, that uses around 1.5v so the forward v to the diode would be around 2.5 if you're using a lithium or around 3v if using 3 primaries

I've used similar drivers as these and used 3AAAs and has been happily running for 2/3 years
 
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