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It's been discussed before: http://laserpointerforums.com/f42/making-ttl-driver-dx-200mw-greenie-51916.html#post720357 If you wanted analog modulation, you could cut the trace leading to pin 3 (+ input) of the op-amp and wire in your own voltage (from a DAC or some other source), with the max...

My camera does a terrible job of capturing 445nm (I cheated and changed the hue in Photoshop to make it look a little more correct), and the beauty of lasers in general, but here's mine: From the left: 660nm SOC module from SF-AW210 @ ~150mW, 532nm Green Module @ ~3-10mW (rebuilt, from a...

Because it looks like I didn't do my research correctly when picking a driver. I wasn't aware that the FlexDrive could handle more current. I had read about a couple improvements that the MicroBoost offered, like PWM and a better potentiometer, didn't really think to check the current output.

No I set it myself. I can't speak for the life of the driver, but it works fine for me, it just about cuts out at the rate of the diode/heatsink heating up, so it's a bit of an indicator to me to turn it off and let it cool down for a while.

A140's are considered the better diodes, I believe, though there is no good data to back that claim. The assumption comes from the XJ-A140 projector having a higher lumen output, and thus is driving the diodes at a higher current/duty cycle. With proper heatsinking, even at 1000mA, the diode...

No PM, glad to hear they shipped though. Thanks for organizing the GB.

Can't send enough thanks to all those who made this possible! Woohoo same-state-shipping! (Laser not included ;) ) Also my overspec 5mW green is still slightly visible through these goggles as well.

I got my 445 diode. I love it, put it in a stainless 18650 build. Here's a vid: nkSeNWYN5u8 Wish I had a real LPM to see what this diode is actually putting out, but I'd say it's easily over a watt. Driving it at 1200mA with a MicroBoost. Thanks for sticking it out with the GB, I'm glad I did...

Re: 445nm A130 Lens Comparisons! Well I'm not sure if I got the right lens either, just arrived today. It looks completely uncoated, unless it's very subtle or I'm just not looking at it the right way (tried looking with an LED flashlight, normal tungsten light, sunlight): Edit: From the...

You can use them directly if they're both in parallel. If they're in series, the maximum voltage they'll put out should be 8.4V, so use the diode's forward voltage of about 4.2, and your resistor needs to drop 4.2V in that circuit. If you're driving at 500mA for example, your resistor should be...

Your oscilloscope measures a voltage applied across a 1M ohm resistor, essentially. So by putting the cable across the output of the driver will just show the open circuit (full) voltage of the driver, since it's trying to push whatever current you set through 1 million ohms of resistance. To...

This seems like a pretty dead thread, but I was aiming to do the exact same project earlier this summer, but I haven't had any good luck with my green laser module (to be honest it might just be because it's a piece of crap I got out of a $5.29 Ebay greenie), and really doubt its ability to be...

I've had good success with pushing a diode out slowly using a vice and a solid metal rod on the face of the diode (might crack diode windows though, I've only tried on some Sure module red laser diodes, which have no window). Worth a try anyways if you don't want to pay for a diode press tool.

Correction, for multiple resistors the equivalent resistance is: 1/Req = 1/R1 + 1/R2 + ... Thus, Req = 1/(1/R1 + 1/R2 + ...) Or for two resistors, Req = R1*R2 / (R1 + R2) Personally, I use Excel for my formulas, and I've got a "calculator" for a DDL driver (and others), to find both the...

Re: 445nm A130 Lens Comparisons! If you don't mind scratching the acrylic lens, you could use a small screwdriver to pry it out like this:

Re: 445nm A130 Lens Comparisons! Alright, thanks. All I've got at the moment is a glass lens coated for 650nm and a bunch of acrylic lenses, so I don't think any of those would be suitable on my 445nm build until I get a proper lens, which may be a while.

Re: 445nm A130 Lens Comparisons! In the original pic (http://www.sonic.net/~jayrob/445%20lens%204.jpg) you have the bigger dome side of the lens facing away from the diode, which does look more correct to me, but when I tried that I couldn't get my diode to focus (just using a 405 diode right...

Voltage may be much smoother than current. Here is an oscilloscope shot of my driver, channel 2 (blue) is current (1mV = 1mA), channel 1 (yellow) is voltage: I am using an 18uF ceramic capacitor as suggested using National's simulation tools.

Have you tested the output of this thing on an oscilloscope? I've had some pretty bad issues with a similar project, see here: http://laserpointerforums.com/f42/pwm-drivers-lasers-why-why-not-52477-3.html#post748475 Switching converters have inductive spikes that could potentially kill or damage...

No, there always needs to be at least one capacitor. An inductor provides voltage for half the time, and the capacitor provides voltage for the other half (as far as I know). Without a capacitor it would be extremely choppy with lots of bad spikes. Here's a good resource on how boost and...