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Old 08-19-2013, 05:14 AM #1
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Default Max volts into red diode?

I am building my first project (just saying incase you haven't seen my other threads) and I got problems using 3AAA batteries and got too low of mA to the load, so I used a 9 volt, but volts across load is like 3.7, is this too high? or will it only shorten the life of my diode? I have 5 diodes btw, so if it shortens it just slightly to moderately i'll be okay as I don't plan to have this be my only laser, just enough to satisfy me while I gain experience and money for a blue laser


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Old 08-19-2013, 06:21 AM #2
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Default Re: Max volts into red diode?

Cant tell if a troll or not.

But your wording is really bad.

so you have 5 diodes in series?

You using a driver?
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Old 08-19-2013, 06:33 AM #3
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Default Re: Max volts into red diode?

lol, sorry, i'm tired, I have a single diode, and a driver, but after the driver the voltage is like 3.7, is that too much for a diode?
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Old 08-19-2013, 06:44 AM #4
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Default Re: Max volts into red diode?

the part about 5 diodes was to say I have spares incase I mess up, but the question was legit, I want to know if they'll fry at 3.7 volts if the current is good, or if they'll just suffer from a shortened life. if I don't make sense I apologize, where i'm at its almost 3am
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Old 08-19-2013, 06:52 AM #5
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Default Re: Max volts into red diode?

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.
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Last edited by Fiddy; 08-19-2013 at 06:57 AM.
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Old 08-19-2013, 07:07 AM #6
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Default Re: Max volts into red diode?

okay, so how can I get that lower? i'm running my driver with a 9 volt because 3 AAA's wasn't enough for the TTL and the diode, I was only getting 180 mA, perhaps 7.5ish volts in should solve it?
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Old 08-19-2013, 07:09 AM #7
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Default Re: Max volts into red diode?

what driver is it? On a good regulator, more input volts doesnt mean more current.

How are you setting the current?
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Old 08-19-2013, 07:12 AM #8
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Default Re: Max volts into red diode?

Amazon.com: AixiZ 2 pack red and IR laser diode driver 80-500mA w/TTL: Everything Else

that's the driver, I set the current by using my test load and set it using the pot on the driver
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Old 08-19-2013, 07:22 AM #9
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Default Re: Max volts into red diode?

Dont go over 5V input!

How are you measuring the current?

Do you have a test load?
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Old 08-19-2013, 07:24 AM #10
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Default Re: Max volts into red diode?

the TTL requires 5Vin just to operate the driver, I could try again at 5Vin and not use TTL, but when I did that I got no mA out the end. i'm measuring current across the resistor in my test load using my multimeter
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Old 08-19-2013, 07:26 AM #11
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Default Re: Max volts into red diode?

may I ask if you've used a driver that had TTL before and just not used the TTL? is that possible?

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Old 08-19-2013, 07:28 AM #12
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Default Re: Max volts into red diode?

Nah never used a driver with TTL.

How many diodes are you using on your test load?

have you turned the pot up an down and watched the current?
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Last edited by Fiddy; 08-19-2013 at 07:29 AM.
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Old 08-19-2013, 07:29 AM #13
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Default Re: Max volts into red diode?

4 of them
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Old 08-19-2013, 07:33 AM #14
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Default Re: Max volts into red diode?

I turned the pot and watched the current, I don't remember much, but it wasn't doing much when the positive lead wasn't connected to the TTL positive input, the driver wasn't outputting much of anything. that was before I switched to the 9volt
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Old 08-19-2013, 07:33 AM #15
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Default Re: Max volts into red diode?

try using 3 diodes, do you have a photo of how you wired it up?
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Old 08-19-2013, 07:34 AM #16
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Default Re: Max volts into red diode?

3 diodes on the test load? why?
and I can take a picture, it'll be about 5 minutes
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