Recent content by Jonathane

I tried shining it at a matchhead and that didnt catch fire, ill try pointing at some black paper to check it. Makes sense, heres a picture: I hope you guys can follow, I'm not an electrical engineer, it could be a lot better i guess.

When I hook up the lpc826 diode it doesnt produce a hot beam at all, but the module does get hot. Do you think the diode was a scam? I bought this one: 660nm 300 400mW CW Red Laser Diode LPC 826 Special OFFER | eBay

The thing is I read that the amount of mV measured on the test load is roughly equal to the amount of milliamps that go through the diode, and i measure only 320mV. :confused:

Hey everyone, Im making (well, trying to make) my first burning red laser from a lpc 826 diode that I ordered from ebay here. I made a driver using a lm317, a capacitor, diode and some resistors. If I put 2 ohms of resistance in the driver I measure about 360mV over the 1ohm resistor in my...

Thanks! I ordered 2 battery cases for 3 AA batteries and hooked them up. Now I measured about 500mV on the resistor, which seems to be too much for the 3 ohms of resistance.. also when I add a resistor I meaure something like 450 mV. I decided to try it out with the diode, it lit up, the lm317...

As a side question, I found old 2 capacitors in my house, one is 10μF and the other 100μF. I assume a higher capacitance can handle higher voltage spikes, but how do I know how much is enough, and is it bad/possible to have too much? I can find very little information about selecting the...

Thanks for the info, very useful :thanks: Found that picture too though in a thread about how to make a dummy load, mine contains 4 1N4004 diodes. I have a LPC826 diode. The 3 resistors I was talking about and you can see in the picture are part of the driver.

Thanks for the help, what power source would you guys recommend? Something like 4 AAA batteries? I tried connecting 3 of those using a container that i got from a flashlight, but I measured like 15mV so I guess 4.5V is not enough. I dont have anything that can contain 4 to try that out though..

http://s17.postimg.org/nzb2igldb/photo_2015_09_28_11_35_47.jpg for larger size

Thanks for the link!, I looked at this drawing for the driver: How to build a laser (general guide) : Step 3: Driver This is what is looks like: Looking at that link it kind of looks like the test load should be connected to the other side of the resistors, but if I try that out I measure...

Im in the process of making my first home-made laser. I ordered the components to make a test circuit and driver online. I connected 3 1 ohm resistors in series to a lm317 and when measuring the mv over the resistor in the test circuit a got about 380 mv, dropping to about 300. I guess adding a...