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Old 04-19-2013, 10:25 PM #1
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Default Couple of electronics questions

I have a gas laser PSU, its a melles griot 05-lpm-830-065, and it takes 12vdc at .7 to 1.2 amps.

All i have are 2 6volt duracell blocks, and some 18.5v laptop bricks at 4.9 and 2.7 amps.

Whats the best way to supply the laser psu with the 12v at a steady ~1 amp, using what i have?



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Old 04-19-2013, 10:42 PM #2
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Default Re: Couple of electronics questions

You don't have to regulate the current for that powesupply, just make sure your power source can handle the maximum draw for long enough to meet your needs. Put the two 6V cells in series, it should power the supply for at least a short while. The 18v bricks will damage it though.
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Old 04-19-2013, 11:07 PM #3
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Default Re: Couple of electronics questions

is there an easy way to drop the brick voltage?
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Old 04-20-2013, 12:35 AM #4
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Default Re: Couple of electronics questions

Yes but you would need several electronic components. It can be done with as little as three parts, but the 1A of current required will push the limit of easily acquired components.

If you take a LM7812 voltage regulator, a capacitor between 1uF and 100uF, and a heatsink (absolutely needed!) for the regulator you can drop the 18V to 12V. The 7812 is rated for a maximum of 1A with good heatsinking, but I've pushed them farther when needed as long as they are kept cool.
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Old 04-20-2013, 04:42 AM #5
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Default Re: Couple of electronics questions

Seidweise;

Just find a 12 VDC plug in supply.

They are fairly common.

I have several if you need one.

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