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IIRC, in the testing phase I hooked it up on the scope. The ripple didn't look to be a concern. Since LDs are normally pulsed (at least the writing ones), I didn't consider the ripple to be a large factor. Just checked the data sheet and threw another un-modded charge 2 go unit on the scope...

The parameters of the board in the second mod must be different than the first. This one will light matches almost instantly.

You can get something that "looks like" a Charge to Go. There appear to be some differences from the DX pics and as I mentioned in the first post, there are different versions of these with different circuit boards. So if anyone is planning this mod, please be sure to test it first with an...

This configuration runs the circuit outside its normal operating range and by a bit of a fluke, the current sharply drops off at the voltage of the Bluray. There are some additional notes in the first post.

With some friends.

I made another of these (version 2). Changed the switch and the switch guard.

Here is an eye response chart. Trace your wavelengths up and to the left axis and compare the numbers.

Some thoughts..... I now have the Coherent module and have started to think about an enclosure. I was going to put the thermopile head inside the enclosure, but I wonder if it's better to leave it exposed to ambient air. Here's my reasoning: The sensor normally has temperature...

Does anyone know if the black coating on the thermopiles are sensitive to oils from skin?

Great, I look forward to seeing the pics. Cheers, Paul

Got my Coherent board today. Thanks RoSSco! I gave it a quick test with my DMM (it goes to 0.01mA) and the output seemed reasonable for the lasers I tried.

I don't think they will be overly effective. Depending on which LM3410 you have (the 525kHz or the 1.6MHz), it looks like the choke will have an impedence of about 15-40 ohms (a bit of extrapolating from the graph below - reds lines are mine) at those two frequencies. How bad was the ripple? You...

I'm curious, have you done any destructive testing to see if the paste re-flows under the ground pad of the chip? I have seen instances where the exposed or edge contacts will reflow, but the paste under the body doesn't due to it being a little more insulated than the other contacts. Has...

Just a reminder to be careful mixing up voltages with battery sizes. There are a few different Lithium chemistries and they have different voltages. They can be very sensitives (a fraction of a volt) to overvoltage and undervoltages. If a mistake is made (especially during charging), the...

The source of the image shouldn't matter - I just used the simple imaging program that came with Windows to do the crop above. By the way, are those flat spots on the head - or is that how the scanner made the image appear?

Nice clean picture.  It's OK to crop your images to show just the "meat".  The image is smaller (good for the site - less bandwidth) and it is easier for people to see.

The answer is here. http://www.repairfaq.org/sam/laserdps.htm#dpsldd

Use the wooden block method WITH HEAT. The heat softens the glue considerably. Apply just enough heat to make it a little too hot to touch with bare hands and then work quickly with the wood blocks.

Comparison: SLD1236VL Iop = 130mA (CW) Power = 80mW Wavelength = 658nm SLD1236VL-54 Iop = 130mA (CW) Power = 80mW (spec sheet also says 90mW for 130mA) Wavelength = 658mA (spec sheet says both 650nm and 658nm!)

Your Link: http://maxpowa.telenet.be/electronics/lasers/SLD1236VL-54.pdf