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Howdy all, Wanted to make a nice lab laser with those new 9mm 445nm diodes such as the one listed here: Nichia NDB7875 445nm 9mm Laser Diode With High Quality Single Element Glass Lens | eBay Wasn't sure how I should go about heatsinking this guy. I'm somewhat competent with electronics so I...

A 0.1uF ceramic cap should be all you need for ESD protection. The low ESR on those should protect the diode from any ESD event. I'd tie that directly to the leads coming from the module. Then after the cap i'd just throw in a standard diode such as a 1n4001 and you should be all set to go...

Should be fine, would be pretty darn surprised if that would be enough to kill it. That module should have an internal resistor to limit the current and +- 1V shouldn't matter. So i'm pretty sure that laser is just a low power laser LED + a resistor in series. As long as you don't bypass that...

Best avatar ever!

Howdy all, school has started for me so i've been abit busy. Still working on calibration. Our school labs got a new newport 1916 which is a nice LPM that i'm hoping to do some more calibration on. Trying to go for something abit more accurate than an Ophir 20C-A-1-Y. Not going to release this...

Hmm, a 1602 LCD display + FTDI asic for datalogging. Seems kinda familiar for some reason. :na: Best of luck with your meter a course. I'd be curious as to your ADC resolution and how your going to pull that off all they way up to 5W. ;)

Arduino(s) are lame. MSP430 launchpad = way cooler =D Yea, pins are not really a limitation. Use shift registers to expand digital outputs, use muxes to expand digital inputs, use analog Muxes to expand analog inputs. Then really nice features of embedded micros are hardware based peripherals...

Yea, I suppose I could take it out pretty easily. Was useful for debug and currently the 0 calibration occurs at that stage. Also, the PC automatically bypasses that stage.

Very sad.... but very true. Some of the best hobbyists in electronics, for example, are non majors. Commonly it comes down how much you apply yourself outside of class. In addition, your job can have a big factor in it as well. My internship taught me quite a bit. However, majoring in EE or ME...

Not sure how old you are, but majoring in electrical engineering or mechanical engineering can go along ways towards helping you increase your building capacity =D .

Howdy all, I wanted to create a lab based driver for precision current driving up to 3A+ with low ripple. First question would be what is the peak voltage that I should design for in order to be able to drive all hobbyist diodes currently in use. 7V peak should be enough to cover all of them...

Nice meter mate ;) I thought about using those 20c-a ophir sensors however one thing bothered me. A full part # for those sensors are something like: 20C-A-1-Y. 20C-A indicated the type of sensor, -1 = 1mW per mV -Y = 1064 nm = calibration wavelength. As specified in the datasheet for...

Hey all, been getting quite a few PMs regarding this. I'm honored by the response and sorry, as of now, there still in development. I'm not shipping any of these out the door until i'm confident in my calibration. In addition, I still need to construct a batch of them. Right now I only have a...

I like the way you think. Yup, Seeed was my fab for this board. Seeed is awesome and the only PCB fab I go with these days. Wasn't a huge fan of dorkbotpcb or batchpcb. As for what your referencing, yea, I'm using a micro with a 16bit adc. So I have 2 micros, 1 is a master and the other is an...

Sorry bros, that took alloonnggg time to create. Didn't work so long on it so someone else could try to sell it for me...that is IF I can sell it... theres still curcial development left that could be deal-breaking for all I know. However, there isn't any cheap and easy magical sensor or...

So it doesn't appear that the LM317 peak current ability is the issue then. Sounds more like a peak voltage issue. Diodes are unique cause its hard to use ohms law on them. V=IR , there isn't really a known R for diodes. Consequently, one normally uses a PIV graph or specification. Meaning at...

Something isn't adding up which is why I suspected the driver. I googled LM317 current equation and heres what I got. Vref is normally around 1.2-1.3V (again, need datasheet). So, Iout = 1.2 / 0.33 = 3.64 A. Something isn't adding up. Your resistance value could be wrong, your driver may...

Hmmm, interesting. Where did you buy your LM317T from? Not all LM317Ts can go up to 1.5A. In addition, those that can go up that high may only be for a certain voltage/power range. Only LM317Ts with a current output rating of "1.5A min" are guaranteed to be able to output that current at all...

I usually use a screw based trimmer pot. 18 turns, <2 usd. If your into electronics/DIY, its always nice to have a stockpile of these around. CT94EW102 Copal Electronics Inc | CT94EW102-ND | DigiKey These generally allow for nice accuracy adjustments. However, you can have a 1000 turn pot and...

Interesting advice, i'll have to consider that in the future. All the dev boards that I work with now use mini so I have an extreme abundance of those cables. PCB fab from china that i'm using has price brackets based upon max area. To go down in size in this case wouldn't have saved me money...