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Old 05-05-2011, 02:35 PM #1
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Default Lasers/LED's in series/parallel circuit

Is it possible to hook up a few lasers lasers with a few LED's in a series parallel circuit? The LED calculator online doesn't seem to have a function to include other light sources outside of LED's. Any help would be amazing.


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Old 05-05-2011, 03:06 PM #2
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Default Re: Lasers/LED's in series/parallel circuit

It sure is possible.
What kind of LEDs (Vf), how many?
What kind of laser diodes, how many?

What kind of config did you have in mind?
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Old 05-05-2011, 03:22 PM #3
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Default Re: Lasers/LED's in series/parallel circuit

You have to be more specific, but in general, the rules of thumb are:

Series is only possible if the two have identical current requirements.
Parallel is only possible if the two have identical voltage requirements.
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Old 05-05-2011, 04:07 PM #4
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Default Re: Lasers/LED's in series/parallel circuit

It's for a custom lighting fixture that i am trying to build. I want to start out small to test the waters. I will be using one 3 volt 30mw laser module, and 4 3v LED's with a 20ma.
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Old 05-05-2011, 04:25 PM #5
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Default Re: Lasers/LED's in series/parallel circuit

OK, so the laser already has its driver, right? 'Cause you said "module"...
In that case, since they all have the same voltage requierement, I would hook up
all of your four light sources in parallel to the 3V power source, each LED with an individual
current limiting resistor.
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Old 05-05-2011, 04:31 PM #6
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Default Re: Lasers/LED's in series/parallel circuit

If the LEDs and power source are truly 3V he wont be needing any resistors.
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Old 05-05-2011, 04:40 PM #7
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Default Re: Lasers/LED's in series/parallel circuit

I am thinking I can just get a 15 volt transformer and wire them in either series or parallel.
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Old 05-05-2011, 07:23 PM #8
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Default Re: Lasers/LED's in series/parallel circuit

transformer will give you a.c. LEDs and LD's like D.C.
Likely to glow in the positive half cycle and blow in the negative half cycle.
You'll need a bridge rectifier and sone filter capacitor(s) to turn that transformer's output into D.C. And , you will need some resistors to balance the current in the LED legs.

Why, on earth, a 30mW laser in a 'Lighting fixture'??

Last edited by 123splat; 05-05-2011 at 07:24 PM. Reason: spelling, of course
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Old 05-06-2011, 01:14 AM #9
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Default Re: Lasers/LED's in series/parallel circuit

Quote:
Originally Posted by 123splat View Post
transformer will give you a.c. LEDs and LD's like D.C.
Likely to glow in the positive half cycle and blow in the negative half cycle.
You'll need a bridge rectifier and sone filter capacitor(s) to turn that transformer's output into D.C. And , you will need some resistors to balance the current in the LED legs.

Why, on earth, a 30mW laser in a 'Lighting fixture'??
well I just built this lamp...

YouTube - 166 0829

Now imagine in each hole there was a transmission matrix diffraction grating covering each hole with a laser shining through. With the lights off it would look amazing. I think the question you should ask yourself is not "why"....but "why not?!"

Also your response kind of went over my head a bit =P

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Old 05-06-2011, 04:07 AM #10
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Default Re: Lasers/LED's in series/parallel circuit

Quote:
Originally Posted by KTurner13 View Post
"why not?!"
Safety hazard?

Just run each on its own driver.
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Old 05-06-2011, 04:12 AM #11
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Default Re: Lasers/LED's in series/parallel circuit

Quote:
Originally Posted by Cyparagon View Post
Safety hazard?

Just run each on its own driver.
should i used a 15mw laser? can you point me in the right direction on information about "drivers" for lasers?
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