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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



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Old 10-31-2011, 07:59 PM #1
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Smile cr123a's to power driver?

Im using this 1.8a driver: FS: Mohgasm Linear Drivers

will 2 cr123a's in series work well to power it? they are 1800mah.
If they don't supply enough power, does anyone know what my expected power output would be to the diode?

im powering a 1.5-2w 445m diode.
thanks

(also if anyone could let me know roughly how long these batteries will run in this setup, that would be great too.)



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Old 11-02-2011, 04:39 PM #2
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Default Re: cr123a's to power driver?

Use this simple formula to calculate resistance,amps and voltage

A=R/V
R=V/A
V=R*A

V=voltage
A=Amps
R=Resistance

Now by taking the resistance and the amps in the driver itself you can calculate the perfect voltage of the battery for the driver you want to use
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Old 11-02-2011, 05:28 PM #3
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Default Re: cr123a's to power driver?

^Ohm's law doesn't work here. A driver is far more complex than a simple resistor.
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Old 11-02-2011, 05:35 PM #4
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Default Re: cr123a's to power driver?

Quote:
Originally Posted by Cyparagon View Post
^Ohm's law doesn't work here. A driver is far more complex than a simple resistor.
yep just found it out in other topic.
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Old 11-02-2011, 06:11 PM #5
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Default Re: cr123a's to power driver?

can i just get a yes or no? :P
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Old 11-03-2011, 12:34 AM #6
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Default Re: cr123a's to power driver?

It should work, but it's a big strain on the batteries and you'll be lucky to get a 20 minute run-time.
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Old 11-03-2011, 12:41 AM #7
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Default Re: cr123a's to power driver?

just a quick check.
to increase duty cycle/run-time one can parallel another "2 CR123 in series" will help rite?
provide size isn't a concern.
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Old 11-03-2011, 01:30 AM #8
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Default Re: cr123a's to power driver?

If you have space for 4 CR123s, then you have space for 2x18650s. 2x18650s will have substantially higher capacity than 4xcr123s.
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Old 11-03-2011, 02:41 AM #9
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Default Re: cr123a's to power driver?

does anyone know what the expected output current would be for 2 cr123a's?
I don't think I want the 1.8a the driver will give out anyways so I can increase the diode lifetime....
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Old 11-04-2011, 05:14 AM #10
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Default Re: cr123a's to power driver?

yes it is designed for 2x lithium batteries in series, the driver will maintain 1.8A's until the batteries voltage fall below the Vout+the drop out voltage.
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