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Old 09-21-2013, 10:16 AM #1
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Default Powering laser diode from aa battery?!!!

I bought a 1.5w laser diode and the people send me a datasheet with a video of them burning stuff, And i noticed there running the diode on 4 1.5v aa batteries!

I thought you're not meant to do that or do the batteries have like a maximum output current?

Can i do the same with my diode or do i have to use a driver, and i'm just wondering if it does damages the laser diode powering directly from battery do you think they just done it to make the laser look smaller i mean they did have over 300 of them so doesn't matter if they damage one right?



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Old 09-21-2013, 11:08 AM #2
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Default Re: Powering laser diode from aa battery?!!!

It's generally a bad idea to use 4x AA batteries to power a diode.

I'm assuming it's a blue 445nm diode, right? They generally have forward voltages of 4.5-5.5V, and using 4x AA batteries may or may not kill it.

The voltage may sag enough that the current drops down to a reasonable level, but it's best to use a driver to effectively control the current.

Ask them if they give refunds if you blow the diode by following their video.
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Old 09-21-2013, 12:11 PM #3
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Default Re: Powering laser diode from aa battery?!!!

The diode in the video is a 1.5w 808nm i guess they just used batteries to make it look smaller and easier to setup.
I don't want to take a chance so i will just use a driver.
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Old 09-22-2013, 07:15 AM #4
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Default Re: Powering laser diode from aa battery?!!!

They were using a driver in the video. AAs can supply over 8A, so 6V worth directly into the diode would have killed it nearly instantly.
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Old 09-22-2013, 11:42 AM #5
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Default Re: Powering laser diode from aa battery?!!!

wow well that must be one tiny driver lol.
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Old 09-23-2013, 05:20 PM #6
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Default Re: Powering laser diode from aa battery?!!!

Some popular drivers here tend to fit inside the aixiz rear end.
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Old 09-23-2013, 05:24 PM #7
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Default Re: Powering laser diode from aa battery?!!!

wow really! have any links ?
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Old 09-23-2013, 06:07 PM #8
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Default Re: Powering laser diode from aa battery?!!!

Quote:
Originally Posted by deltawars View Post
I bought a 1.5w laser diode and the people send me a datasheet with a video of them burning stuff, And i noticed there running the diode on 4 1.5v aa batteries!

I thought you're not meant to do that or do the batteries have like a maximum output current?

Can i do the same with my diode or do i have to use a driver, and i'm just wondering if it does damages the laser diode powering directly from battery do you think they just done it to make the laser look smaller i mean they did have over 300 of them so doesn't matter if they damage one right?
Rest assured, there is a driver module in that housing. You can't power a diode directly from 4 AA batteries. Well, I should not say you can't, you can but it would only last for a second before lights out!
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Old 09-23-2013, 06:08 PM #9
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Default Re: Powering laser diode from aa battery?!!!

where can i get a driver that small?
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Old 09-23-2013, 10:27 PM #10
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Default Re: Powering laser diode from aa battery?!!!

Shorting AA's through a DMM, I've seen peaks of over 15A from a fresh battery. Sometimes you can get away with running a diode off batteries with a single resistor, but you need to calculate it carefully as the current isn't constant in regards to voltage. Voltage goes up, so does current. It's also inefficient and will get very hot.
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Old 09-23-2013, 10:33 PM #11
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Default Re: Powering laser diode from aa battery?!!!

you can get them here, here, or various other places. Google is your friend!
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Old 09-24-2013, 05:10 PM #12
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Default Re: Powering laser diode from aa battery?!!!

https://illuminationsupply.com/laser-components-c-77/ < check out the pics too, for an idea on the size of these devices.
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