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Old 09-30-2007, 04:44 AM #369
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Default Re: DIY Homemade laser diode driver



Congrats... pictures? Ideas? :

--DDL


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Old 09-30-2007, 10:32 AM #370
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by Daedal


Congrats... pictures? Ideas? :

--DDL
Here are a few pics.





As far as ideas, Yes I am currently working on a LED power meter.
I have to find the chip that controlls the LED BAR, It will light each bar as the voltage increases.
Its in my garage somewhere : I built an O2 meter with it, to adjust and monitor fuel mixtures. All from Rat Shack. I'll post the Chips number as soon as I find it.

I think the Power Meter would be cool for a visual aid to keep from hooking a meter up constantly, and maybe help to prevent from frying LDs.
 
Old 09-30-2007, 11:33 AM #371
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Default Re: DIY Homemade laser diode driver

Well I found that O2 Meter in my tool box in the garage.
Here are a few pics of it and its circuit. Guess I have another container for a box style laser






Here is what the chip has printed on it JB112AF & LM3914N-1
Heres a link to the Data Sheet http://pdf1.alldatasheet.com/datashe...LM3914N-1.html
And where to get it http://www.digikey.com/scripts/DkSea...e=LM3914N-1-ND

For the LED BAR, The Part# 1001HDA
And where to get it
http://www.digikey.com/scripts/DkSea...e=LM3914N-1-ND

The LED Part# above is for a LED with 10 RED bars, I have another one that is similar, However it has 7 green and 3 red bars. I like it much better. A similar one with 6 green and 4 red can be purchased Here http://www.gatewayelex.com/led.htm

I would like to fine one of these for sale somewhere!

http://news.thomasnet.com/fullstory/7513/589


I'm sure with the proper resister, this circuit could be modified to work the the voltages that DDLs driver uses.
10 Segment red LED bar graph display- 20-pin DIP 20mA, 2VDC per element.

I'll post more information as I progress.
 
Old 09-30-2007, 02:07 PM #372
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Default Re: DIY Homemade laser diode driver

I ran across this and was thinking it could possibly be used to TEST LDs.
Is this feasible? Of course you would have to clip the 3 pin on the LD in order to fit it into the socket.

Quote:
Pocket size LED - Tester
You can carry this light (no pun intended) pocket sized tester around with you and test LED’s all day long. The socket strip provides 2mA, 10mA, 20mA, 30mA, and 50mA drive currents. There are 7 of the 10mA sockets so you can do side by side comparisons of the color and brightness for up to 7 LED’s. This useful tester requires a 9-Volt battery (not included) and has a push-to-test button that is also used to drive the green battery-check LED. Approximate size is 2 3/8” W by 3” H by 7/8” D.
http://www.alltronics.com/cgi-bin/it...2DLED%2DTester


 
Old 10-01-2007, 11:35 AM #373
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Default Re: DIY Homemade laser diode driver

What a coincidence, I just got a LM3914 last week for my LD circuit It works great! I still have to put it in my torch, i only tested it with some leds, not a bar display. I wanted to measure the current through the LD, so i set it up to about 25mA per segment 0-250mA.
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Old 10-01-2007, 08:37 PM #374
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by naplam
What a coincidence, I just got a LM3914 last week for my LD circuit It works great! I still have to put it in my torch, i only tested it with some leds, not a bar display. I wanted to measure the current through the LD, so i set it up to about 25mA per segment 0-250mA.
Glad to hear it! Please keep me/us updated, I would like to see how you set it up.
 
Old 10-02-2007, 02:07 AM #375
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Default Re: DIY Homemade laser diode driver

Quote:
Originally Posted by High Octane
Glad to hear it! Please keep me/us updated, I would like to see how you set it up.
I opened a new thread about it.

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Old 10-08-2007, 12:28 AM #376
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Default Re: DIY Homemade laser diode driver

When I finished assembling my driver i tested the voltage it was putting of and it was still 5.8. i am using 4 aa batteries to power it at 6v. Do you know what the problem could be i think i have everything connected right. I am trying to get everything straightened out before my LD gets here. Sorry if i sound stupid i am fairly new at this.
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Old 10-08-2007, 01:08 AM #377
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Default Re: DIY Homemade laser diode driver

The first thing I'd check is that the pin numbers on the LM317 are what you think they are. If you used a TO-220 case part like you'd find at Radio Shack, the pins are Vin, Vout, Adj, as read from RIGHT to LEFT. That's different than from in the schematic at the top of this thread.
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Old 10-08-2007, 01:22 AM #378
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Default Re: DIY Homemade laser diode driver

I have them hooked up right but it still reads 5.8 volts. I dont have it hooked up to anything such as a load could that be the problem ? It reads 218 ma so i think thats in the right range.
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Old 10-08-2007, 01:46 AM #379
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Default Re: DIY Homemade laser diode driver

Hello stump and welcome to the forum.

You need a load across the output to test your circuit. Please read through the following thread for your answers..

http://www.laserpointerforums.com/fo...num=1191361180
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Old 10-08-2007, 04:38 AM #380
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Default Re: DIY Homemade laser diode driver

Thanks for the welcome all of you guys are a great help. For some reason I thought i remebered my dad saying something about it having to be under a load. I cant wait to get my LD in now. Thanks again.
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Old 10-08-2007, 05:31 PM #381
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Default Re: DIY Homemade laser diode driver

NOOOOOoooooooo!!! Don't test it for the first time with a poor defenseless LD. Use four 1N4001 diodes in series for a dummy load.
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Old 10-08-2007, 08:45 PM #382
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Default Re: DIY Homemade laser diode driver

Oh im gonna test it trust me i dont have much money to blow
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Old 10-10-2007, 09:15 PM #383
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Default Re: DIY Homemade laser diode driver

Will this burn my diode up? Any suggestions sorry if it looks bad this is my first electronic project. click the attacment to see the picture better.
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DIY Homemade laser diode driver-proto.jpg  
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Old 10-11-2007, 10:07 AM #384
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Default Re: DIY Homemade laser diode driver

dude resize that pic its too big to scroll around and see everything...
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