Old 10-13-2012, 01:01 PM #1
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Question Laser Voltage

Hi! I recently recieved a red 5mW laser from an ebay seller which had a defective lens. I took the laser apart and did some adjustments and it's now working fine. I made a new host from some tubing and a switch I had at home. However, the way the host is made it's not that easy to change the batteries. So what I wonder is if I can extend the battery life so I don't have to change them very often.

Would it harm the laser if I drive it with 3x AA (1,5V), instead of 2xAAA (1,5V) which it was designed for? Is there some other configuration I can use to extend the battery life, while not doing any damage to the diode?

3xAA, 2x A or 2x 9V is probably the largest I can fit in the host.

Thank you for reading


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Old 10-13-2012, 01:08 PM #2
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Default Re: Laser Voltage

Use the same voltage but Higher Capacity batteries.
By using 3 batteries you are increasing the supply
voltage by 50%.

I would assume the manufacturer of the Laser designed
the Driver to only take 3Volts and not 4.5Volts.
That again depends on the Driver design.


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Last edited by lasersbee; 10-13-2012 at 01:09 PM.
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Old 10-13-2012, 01:47 PM #3
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Default Re: Laser Voltage

I agree with Jerry stick to 3V. If you can fit 2 9V batteries in it, what you can do is break the 9V's apart getting the 6 AAAA's out of them, and then set them up two in series and the rest parallel. This would give you 3V and a higher capacity.
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Old 10-13-2012, 04:28 PM #4
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Default Re: Laser Voltage

The problem is you're only using a small part of the cells' capacity since low power reds like that don't have a driver. Using a driver (buck/boost in this case) would give you a run time of up to 40 hours with 2xAAA and up to 100 hours with 2xAA.

But jeez, really? All this trouble for a <5mW PVC tube?
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