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Old 03-25-2017, 09:02 PM #1
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Default Stirling Engine Powered Laser Project Idea.

Nearest I can tell, is this Stirling Engine should be putting out about 6v and at least 0.03 ... amps.




I think that would push an efficient diode/driver combo to about 10mW or so.

It would show from the discovery of fire, thermal to mechanical, mechanical to electrical and electrical to laser emission all in a tidy desktop package.

Any recommendations on where I can find a quality low power driver/diode combo for this?

Could I go real cheap and use a diode/driver from a cheap "5mW" pen?

I also want to use clear plexiglass for the diode/lens housing and go with an open can on the diode so that can be seen as well.

Add a steering mirror and I think it will make a dandy addition to my laser collection, and something quite unique.


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Old 03-25-2017, 09:44 PM #2
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Default Re: Stirling Engine Powered Laser Project Idea.

Wow! Thinking that's a fantastic idea ! I've seen these engines on YouTube and thought they were to cool . Best wishes with your build. This is one review and going up love reading.
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Old 03-25-2017, 10:32 PM #3
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Default Re: Stirling Engine Powered Laser Project Idea.

I think the "problem" would be vibration. If that bugs me I'll just put it in my vice to dampen it. On the desk it would make an interesting effect on the wall the laser is pointed at.
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Old 03-25-2017, 10:44 PM #4
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Default Re: Stirling Engine Powered Laser Project Idea.

Yes the videos do show some vibration, maybe put just the Diode on some type shock/mounts that move separately ?

Ps, it would make s cool effect though.
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Old 03-25-2017, 10:58 PM #5
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Default Re: Stirling Engine Powered Laser Project Idea.

You should be able to run a cheapie Red Keychain
Laser with your 6V/30mA.
You'll need to test the Voltage and Current under
load to see what that small DC motor/generator
will actually put out..

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Old 03-26-2017, 12:38 AM #6
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Default Re: Stirling Engine Powered Laser Project Idea.

I'm basing by guess on that those LEDs run on about 30mA.
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Old 03-26-2017, 02:58 PM #7
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Default Re: Stirling Engine Powered Laser Project Idea.

Quote:
Originally Posted by AaronT View Post
I'm basing by guess on that those LEDs run on about 30mA.
I can light a white LED at 3V and 3mA...
Like I said... you'd need to test the actual
Voltage and current under load conditions.

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Old 03-27-2017, 12:59 AM #8
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Default Re: Stirling Engine Powered Laser Project Idea.

If it produces 30 mA at 6 volts that should be sufficient to drive a small laser diode, like the cheap red 5 or 10 mW modules.

The output voltage of such a generator will vary greatly with motor speed though, so you will probably need to put some system in place to prevent overdriving the diode. Clamping the voltage with a couple of zener diodes will probably do the trick just fine, though they will waste any excess energy as heat.
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Old 03-27-2017, 10:29 PM #9
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Default Re: Stirling Engine Powered Laser Project Idea.

Quote:
Originally Posted by AaronT View Post
I'm basing by guess on that those LEDs run on about 30mA.
Only if you're trying to kill them. 20mA is the max rating for most 5mm LEDs, but they will appear lit at well under 1mA.

Do you not have an ammeter?
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Old 03-27-2017, 11:21 PM #10
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Default Re: Stirling Engine Powered Laser Project Idea.

Don't have the stirling to test.

I'm still digging around for an old read pointer I was sure I had.

This is looking like a $25 project so I may toss it together.
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Old 03-28-2017, 01:47 AM #11
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Default Re: Stirling Engine Powered Laser Project Idea.

Yeah, just see what it actually does in terms of voltage and current. I'd connect the generator to something like 4 pieces if 1n4007 diodes and see what voltage and current it produces driving that. The voltage should not be a problem (2.5 to 3 volts or so), and if it does over 10 mA current at that you can look into low power laser diodes to drive.
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Old 03-28-2017, 10:58 AM #12
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Default Re: Stirling Engine Powered Laser Project Idea.

Quote:
Originally Posted by AaronT View Post
Don't have the stirling to test.

I'm still digging around for an old read pointer I was sure I had.

This is looking like a $25 project so I may toss it together.
If I knew what part of the Globe you lived..
I could send you a Red Laser for your tests.
There is no location under your Avatar...

Jerry
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Old 03-30-2017, 12:51 AM #13
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Default Re: Stirling Engine Powered Laser Project Idea.

These would be the $1 including global shipping little lasers sold on ebay, right
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Old 03-30-2017, 02:30 AM #14
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Default Re: Stirling Engine Powered Laser Project Idea.

Quote:
Originally Posted by Benm View Post
These would be the $1 including global shipping little lasers sold on ebay, right
Already ordered one.
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Old 03-31-2017, 12:14 AM #15
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Default Re: Stirling Engine Powered Laser Project Idea.

Quote:
Originally Posted by Benm View Post
These would be the $1 including global shipping little lasers sold on ebay, right
Yeah... that's right...
Looks like he doesn't need me to ship one.

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Old 03-31-2017, 07:33 PM #16
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Default Re: Stirling Engine Powered Laser Project Idea.

Thanks Lasersbee for the offer but I'd already ordered one by the time I seen your post.

I'm assuming I'll need a step down/buck driver to drop the voltage from 6v to 3v for the diode/driver assembly out of the pen.

Would this work?
3A DC Buck Step Down Adjustable Converter Module 4.5v-28v to 3.3v 5v 6v 9v 12v
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