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Old 11-10-2009, 03:48 PM #1
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Unhappy Need help building driver...

I bought a 405nm 100mw blue laser diode driver on ebay. It came to me in pieces. I need help putting it together because it doesn't make much since to me. I have been able to identify a few of the pieces though. I will post the pictures i have for this driver.


9v adaptor


The circuit board


47uf resistor


Im not sure what these are


POT Module


10uf resistor


LM317


15r resistor??? (i think)


0.1uf resistor

and of course...

the schematic

does anyone have an esier to understand schematic or graphical representation of how this is supposed to be put together?


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Old 11-10-2009, 07:30 PM #2
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Default Re: Need help building driver...

I've found a rendering of the chipset.




Does everything seem correct and in working order in the representation?

P.S. If the 3-D schematic is hard to see, i can alter it to be more legible.
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Old 11-10-2009, 07:36 PM #3
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Default Re: Need help building driver...

The schematic looks to be wired right as far as I can see, but if it is a 15-ohm resistor the maximum current would only be about 83mA.
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Old 11-10-2009, 10:18 PM #4
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Default Re: Need help building driver...

The 15r resistor is actually optional. It can be removed for higher output.

Or so I'm told. What do you think?
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Old 11-12-2009, 09:52 PM #5
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Default Re: Need help building driver...

Looks like you have all the components. Buy a multimeter, build the circuit, and test what the output is before hooking up expensive components (i.e. the laser). That way you can understand what is going on.

Don't know how to hook up circuit or read circuit diagrams? There are many guides on the net for basic electronics. Some are probably in the stickies of the forum. Read them! They're better illustrated and described than what is in this forum.

For other parts of that circuit, there are literally hundreds of thread posts on the same topic here. In fact, that circuit is pretty standard. You'll need to understand the basic electronics though before you start. If you don't... you'll be making a thread asking why your laser is now an expensive LED.
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Old 11-12-2009, 10:12 PM #6
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Default Re: Need help building driver...

Aren't the resistors suposed to be on the adjust pin of the lm317 chip?

I would honestly throw that schemes to the rubbish and follow this ones. make sure to read it all before starting!

It can be done - Laser driver

Yours,
Albert
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Old 11-13-2009, 06:39 AM #7
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Default Re: Need help building driver...

They look like the same circuit to me.
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Old 11-13-2009, 10:37 AM #8
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Default Re: Need help building driver...

I suggest you to make a little change.

Get a 2,2 ohm resistor, and a 22 ohm resistor.

Put the 22 ohm one in place of the trimmer + 15 ohm resistor, then connect in series your 100 ohm trimmer and the 2,2 ohm one, and connect this serie in parallel to the 22 ohm one.

This give you a regulation from 50 to 600 mA, more or less, and prevent the open circuit if you burn the trimmer.

BTW, use a 1 W or similar trimmer, if you find one, it's better for high currents.
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Old 11-13-2009, 01:21 PM #9
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Default Re: Need help building driver...

Quote:
Originally Posted by Rockwell View Post

47uf resistor

10uf resistor

0.1uf resistor
these are NOT RESISTORS, these are CAPACITORS
Quote:
Originally Posted by Rockwell View Post

Im not sure what these are
this is a DIODE (D1 in schematic)
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Old 11-19-2009, 04:55 PM #10
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Default Re: Need help building driver...

The circuit that came with your driver is fine, & they don't come much simpler. You must leave the 15Ω resistor out, or you won't be able to drive your laser diode to full power. Make sure you test the driver with another load before you hook it to your precious diode. Set the trimmer to maximum resistance(minimum current) before you power it up with the laser diode installed, then adjust for the correct drive current. Monitor the current into the driver with a DMM while setting the operating current. When you go to install your laser diode, connect a temporary short across the driver's output connections, than remove it once the laser diode has been connected. This will insure that neither of the driver's capacitors can retain enough charge to pop your diode when you connect it. ALWAYS wear a working anti-static wrist strap before even touching any laser diode, as they can be killed by a static discharge too small to see or feel.

BTW: Blu-ray diodes require heatsinking. Without it they will die within seconds.
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Last edited by tekwiz; 11-19-2009 at 04:57 PM.
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