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Old 10-27-2008, 03:35 AM #1
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Default First laser build

hey i am new to these forums but i saw a couple videos on youtube (including the kipkay one...i know not to do that one after searching these forums) and they fascinated me so i decided to build my own laser. *I saw styropyro's laser tutorial and decided to build it (cause it looked easy and im new to this) *So i got the parts: a pre-installed sony diode in an aixiz housing from stonetek, AA holder, switch, and pot. * i have a couple of questions though
1) I got a 1k ohm pot. *In the video he used a 100 ohm pot. *Does it matter?
2) His camera isnt very good...so i couldnt tell where he soldered things...can anyone clarify? * * * * *
3) how do i know if my pot is at its maximum resistance
4) if this will make me fail miserably tell me now...lol *(<-- that isnt a question... )

Thanks in advance!


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Old 10-27-2008, 01:30 PM #2
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Default Re: First laser build

1) You will find it hard to set with a 1K pot as it is only the last little bit of the movement of the adjuster that is in the 100 ohm range (see drawing below).

2) Depends on driver you use

3)To find out if your pot is at the max resistance wind the adjuster to one end then use a multimeter set on ohms between the centre pin (wiper) and each of the outer pins ( resistance track) in turn, one side will read zero the other full resistance.

4) If you read the tutorials and understand what you are reading there is no reason to fail.

Regards rog8811
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Old 10-27-2008, 10:48 PM #3
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Default Re: First laser build

Thankyou for your reply
* *I have looked around the forums somemore and found that the rckstar driver works pretty well and the dorcy jr works well as a host and a driver...which do u think works better? Or if the circuit I talked about worked could you add a picture of where I solder things?
Thanks again
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Old 10-28-2008, 02:15 AM #4
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Default Re: First laser build

i kept searching...(bear with me here...) and found a video on how to make a Driver. *( i am pretty sure it is DDL driver..) found here -->(i need 10 posts before i can post it but it is on metacafe...) *But i am still unclear on where to attach my diode and my power source. *If anyone can clarify it would be greatly appreciated. *thanks!

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Old 10-28-2008, 06:18 PM #5
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Default Re: First laser build

LM317 driver below....... (second time posted in 5 minutes )... I think you can go to a lower resistor value with the newer Stonetek LD's check here...
http://www.laserpointerforums.com/fo...num=1210649510


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Old 10-28-2008, 11:12 PM #6
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Default Re: First laser build

i bought all the components at radio shack but i got a 10uf capacitor...they didnt have any of the other kind... :'( would it still work? also i got a battery holder that holds 4 double a's (6 volts) would that be suitable for this circuit?

thanks for all your help!
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Old 10-29-2008, 05:03 AM #7
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Default Re: First laser build

also I got a 25 ohm pot in the video instead of the 100 ohm pot like it says in the diagram but it is also adjustable..will it work? Thanks
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Old 10-29-2008, 06:57 PM #8
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Default Re: First laser build

Quote:
but i got a 10uf capacitor
That is the correct value, mfd on my drawing is just the way I was taught to do write it when I was a draftsman.

Quote:
also i got a battery holder that holds 4 double a's (6 volts) would that be suitable for this circuit?
With 6v it will not be long before the battery power sags and the regulator will drop out of regulation.
7.2v is the minimum.

Quote:
I got a 25 ohm pot in the video instead of the 100 ohm pot
That will work fine, the driver will just have a higher minimum output current.

Regards rog8811
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Old 10-30-2008, 02:46 AM #9
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Default Re: First laser build

do you suggest a. 9v battery or a 12 volt?(8 double aas) or something else?
Thanks
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Old 10-30-2008, 10:40 PM #10
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Default Re: First laser build

ya i am working on this circuit to and i wanna use a 9v will it work
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Old 10-31-2008, 03:21 PM #11
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Default Re: First laser build

Its much more reliable (in my opinion) to just use resisters because you don't have to mess around with multi meters because some of my multi meters have internal resistance and will give you a false reading.

Simply take 1.25 (the LM317T's reference voltage) and divide it by how much current you want to drive your diode at.

Example: to get 420ma's you simply take 1.25 divided by .420 amps=2.92 ohms (just use 3 ohms).

--hydro15
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Old 10-31-2008, 10:43 PM #12
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Default Re: First laser build

ya but could i use a 9volt with that cicuit
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Old 11-01-2008, 12:38 AM #13
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Default Re: First laser build

Hey guys,
*I just build this driver today and i was checking to make sure it is good before I start soldering the connections. *I used a free online photo editing software so if you cant tell what the words say just tell me....Here it is...(sorry if the picture sucks...i dont have a camera so i had to take the picture on my iPhone and email it to myself...sorry) can I solder the connections under the breadboard?
* Thanks again!
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Old 11-01-2008, 04:59 AM #14
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Default Re: First laser build

I was getting really bored so i went ahead and soldered everything (i took my time...it took me like 2 hours...) but i finally finished it and i tested it out on an LED and it worked very well ....I took a risk and attached my diode....And thats when things went terribly fantastic ;D...It lit up and made a really really really bright dot on the wall where it was aimed. It is great i can adjust the lense and everything...But...it wont burn..Any suggestions?
Thanks again
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Old 11-01-2008, 05:37 AM #15
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Default Re: First laser build

Quote:
Originally Posted by The_Muffin_Man
I was getting really bored so i went ahead and soldered everything (i took my time...it took me like 2 hours...) but i finally finished it and i tested it out on an LED and it worked very well ....I took a risk and attached my diode....And thats when things went *terribly fantastic ;D...It lit up and made a really really really bright dot on the wall where it was aimed. *It is great i can adjust the lense and everything...But...it wont burn..Any suggestions?
Thanks again
How many milliAmps are you running through it? The PHR diode will burn at a fairly low power output.

Are you sure you have it focused? The 405nm makes a VERY small point when it is focused correctly.

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Old 11-01-2008, 06:11 AM #16
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Default Re: First laser build

thanks for your fast response...to tell you the truth I am not sure how many milliamps I am running though it...how do I check? And would adjusting the pot help?
I will work on focusing it and see if that is the problem...
Thanks
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