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Some chargers do charge a bit higher than 4.2V, but usually by a margin of <0.1V, closer to 4.25V. This shouldn't be enough of a voltage change to fry anything. I'm glad you contacted the builder. This is the first step, because most of the later troubleshooting steps would void any warranty...

I know it's been a few days, sorry it took so long to get back to you. I'd look for a 4x AA or even a 3x AA battery holder. Li-Ion is expensive in that you don't want to cheap out with cheap cells, or a cheap charger. Nor do you want to buy an expensive battery and charger for a single device...

How many volts of power would a spring create?:san: [/trollish] On a less joking note, make sure other members of the household, or even friends, don't have unattended access. They might not realize that it is a custom piece and might insert the battery in backwards, thinking that the worst...

As long as you have to have either a custom-made or an intentionally matched heatsink, I have to ask, why use a module? May as well just add a few features to the custom-made heatsink.

You can't use capacity to indicate quality, because cells capable of higher power output have lower capacity. Today we can get 3400mAh cells, but those are spec'd to deliver 3.4A cont. max. Or you can buy a high power cell, it only has 2900mAh but can deliver 10A continuous. 1400mAh used to...

Re: Replace Silicone Cap on 501b? The retaining ring method is very common way to hold the switch in. You'll also notice as you keep collecting, that most switch boots are the same size! Lotsa fun color-coordinating switch boots :-)

You can use it as a power supply, but not as a laser driver. A laser driver is driving circuitry designed to give the laser clean, constant current. An e-cig driver "drives" a resistive wire. Basically it is a glorified switch. Sometimes it is voltage regulated to some random voltage. I...

Another thing that is worth mentioning, is machining tolerances. If someone machines you a custom module and heatsink meant for an interference fit, do that. The machinist will know what he is doing and allow for the correct tolerance to ensure proper interference fit. Mass produced modules...

plastic tipped. Or, don't use tweezers, because (and I am admittedly no more skilled than a slightly-smarter-than-average chimpanzee) whenever I use tweezers, the tweez-ee usually ends up lost in the carpet several feet away. Flux is very helpful, esp. the cheap tree sap flux from radio hut...

Yuh, Jyuh! Brrattttt! Jai-yuh! WsXj3JVcVxw

Ricktrent4's copper aixiz replacement: This. It needs to become some sort of agreed-upon standard. You would simply need the heatsink to have the threads and hole machined into them, just like the piece on the right side of ricktrent4's picture, except instead of machining it out of 12mm...

You need to know the power requirements before sourcing cells. Just because it is the same size, doesn't mean it is the same thing.

Are you still using a setscrew heatsink? Adding thermal mass to the 12mm module can only go so far, just don't forget about the heatsink. Perhaps a standard "socket" layout can be devised so that in the future, you simply machine this complicated bit in the middle of your heatsink instead of...

The 9V should be fine if you are EXTREMELY conservative with your current. 9V provide very little power, but they deliver that power with 9V potential. Otherwise, I'd go with some AAs in series. Three ought to do it. If you already have Li-ion and charger and know how to use them, you can...

You can always buy new cells when the old ones die, they aren't terribly expensive. Halogen has a high startup current too.

Might be able to catch the leading edge of this. Cool idea. That place can be fairly quiet some days. For folks looking for an easy way in, here is a link to the web client: Mibbit.com Webchat client You can change your name, or you can just click the "Go" button to connect to laserchat.

Wow, this is looking amazing, and very do-able! I was thinking there still might need to be a bit of extra rotational adjustment available, so that you can align the prism's stage with the fast diverging axis of the laser. Right now, the biggest issue I can see is how to screw on the add-on...

I think you are onto something regarding a standard that can be used to correct our laser diodes. If all that is needed to correct most multimode diodes to "good 'nuff" is a cylindrical lens, then why haven't we been using these more often?!?! Seems to me that there might need to be a redesign...

I'd forgotten about these! using a nice diode press like the ones FP makes will just about guarantee that your diode is pressed in the center and not crooked. I've NEVER gotten the back of the aixiz module method to work properly. It always ends up with a crooked diode. The module back piece...

dag, sig, can't rep you, but that makes more sense. So it is the longer leads that could change how it senses the load might make the chip oscillations swing too far. Berry Interesting!