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My 1st build total failure.....so now I have this...

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drewk302

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Here is my 1st attempt http://laserpointerforums.com/f51/help-built-driver-having-problems-60824.html and failed badly, I got lots of great help from everyone, but at the end noone seemed to know what happened and I still dont.
I just picked up a toshiba/ samsung 20x with lightscribe burner: Toshiba/Samsung TS-H653 20x DVD±RW DL SATA Drive w/LightScribe (Black) Samsung TS-H653
I am trying to do some research on a driver to build for whatever this can saftely handle. I really dont want to fail on this one. I dont know what went wrong on the last one, if I did I know that would help.
 





bluuray

bluuray

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20x is a lpc i think..
can go up to 380mA?? (safe zone?) or more
 
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drewk302

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I really want to build a driver myself for this. I dont know went wrong with the last biuld. I built 2 drivers and the 2nd one I tried a few diff. configurations also. I have the 7.5v power in to the flashlight host with switch and it outputs the 7.5v fine.
 
Elektrotechniker

Elektrotechniker

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bluuray said:
20x is a lpc i think..
can go up to 380mA?? (safe zone?) or more
Click to expand...

I run mine at 420 mA for 2 years now. It still works and outputs the same power. As far as you heatsink your module in a good way, you can run a loc diode at ~400 mA safely.
 
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drewk302

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Thats awesome, now I just have to make a driver. I have made some following: Laser driver - It can be done and I posted pics, I fixed what I did wrong, but nothing worked. It was reading right under a load, the voltage was kinda high 3.8 ish volts but the ma was 300ish but the diode was very dim. I know the diode was fine, I connected it to a 3AAA pack and had a very strong laser. But in the end I killed the diode.
 
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anselm

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drew, just forget/dismantle your previous attempts at making the driver, take a deep breath,
and the follow this:
Laser driver - It can be done
Start over completely!

Take your time, try to make sense of the diagrams, make sure all the connections
are correct and making good electrical contact.
Make sure, where it matters, that the components are in the correct orientation.
Before you connect the diode, use that test load to confirm the current your driver is outputting.

If in doubt, post pictures and provide as much detail as you can in your questions.
 
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drewk302

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Thanks, I am gonna post pics before i solder and after. I appreciate the help. I want to use a pot. meter but radio shack dosent have one small that I know of that I can use and keep the board small enough.
 
Scoots

Scoots

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Why dont you try making it on stripboard like it says, dont worry about the size too much as you could always make it smaller, after its working as you want. Others on here have made the driver with only 3 components ( lm317, resistor and a capacitor ). What is the max dimensions you want your driver to be ???
 
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drewk302

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Ok I went to rat shack, they didnt have a stripboard, just plain board like I have been using, and with that I just run solder beads. I will use 3x 10ohm resistors for total resistance of 3.333ohm giving me 380mA according to the online calculator, a1n4001 rec diode, 10mf 16v cap (this one is ok right?) 10µF 16V 20% Dipped Tantalum Capacitor - RadioShack.com thats the part number on mine but there its shown blue mine is yellow. Will that be sufficient? Would you change anything?
 
Scoots

Scoots

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The cap should be fine, just make sure its connected the right way round.
 
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drewk302

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Its not marked, so the longer leg is the positive side correct? also the 1n4001 silver stripe side is the pos. side right?
 
Scoots

Scoots

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the cap should have a + sign on it, if not the longer is the + like you said
 
Flaminpyro

Flaminpyro

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Yes that cap will work fine !
You know you realy don't need any ckt
board you can solder the parts to each other ;)
 
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drewk302

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Thank you. Can someone PLEEEEEEEASE tell me the pin layout. I have looked at data sheets online, some say one thing some say another. The back of package is somewhat decieving. I went to radio shack.com and the reviews say the same thing people saying that the package is wrong some say its right. I am blown away by this. I have tried both ways and both didnt work for me on my last build, so I dont get it. I always get refered to the "Laser it can be done" page and thats different to?????
 
Scoots

Scoots

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from left to right with the device facing you the pins are. Adjust. Output. Input
 
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