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Old 08-19-2013, 07:39 AM #17
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Default Re: Max volts into red diode?

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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Last edited by Fiddy; 08-19-2013 at 07:40 AM.
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Old 08-19-2013, 07:42 AM #18
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Default Re: Max volts into red diode?

one sec, it says to resize my pictures, theyre too big
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Old 08-19-2013, 08:01 AM #19
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Default Re: Max volts into red diode?

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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Old 08-19-2013, 08:09 AM #20
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Default Re: Max volts into red diode?

looks alright, wheres that green wire going?
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Last edited by Fiddy; 08-19-2013 at 08:10 AM.
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Old 08-19-2013, 08:11 AM #21
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Default Re: Max volts into red diode?

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
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Old 08-19-2013, 08:13 AM #22
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Default Re: Max volts into red diode?

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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Old 08-19-2013, 08:15 AM #23
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Default Re: Max volts into red diode?

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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Old 08-19-2013, 08:16 AM #24
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Default Re: Max volts into red diode?

ok, goto bed then.
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Old 08-19-2013, 08:17 AM #25
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Default Re: Max volts into red diode?

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?
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Old 08-19-2013, 08:21 AM #26
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Default Re: Max volts into red diode?

do what again?

Dinner time.
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Old 08-19-2013, 08:25 AM #27
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Default Re: Max volts into red diode?

begin working on one of my projects in the early hours of the morning again
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Old 08-19-2013, 11:49 AM #28
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Default Re: Max volts into red diode?

Quote:
Originally Posted by Fiddy View Post
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.
I have killed Red diodes at 3.0 volts before, even with a well regulated current supply!
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Old 08-20-2013, 02:29 AM #29
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Default Re: Max volts into red diode?

3V's is the point where they start to die.
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Old 08-20-2013, 03:51 AM #30
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Default Re: Max volts into red diode?

Sounds good
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Old 08-20-2013, 08:10 AM #31
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Default Re: Max volts into red diode?

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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