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I've been playing around with the little goodies to be found in the PHR-803T sleds today, and have a question to ask about one of diffraction gratings. So the black and white ones in the lower right make the usual linear diffraction pattern: The ones on the top right however make a similar...

Do laser diodes have a maximum voltage, or is it all about the current? I was looking at some datasheets and some don't have a max voltage, but some have one ~0.3V above the typical voltage. For example I'm currently testing a red laser diode with my new current regulator at 40mA and pretty...

A I understand it, the purpose of the capacitor in a driver circuit is to absorb any start-up voltage spikes. Is there any reason that it can't be put across the input voltage before the current regulating components? Surely this would still absorb any spikes, but if the diode was accidentally...

Anyone interested in these at all? I got the idea from a thread from last year about the AMC7135 boards that DealExtreme sell. The AMC7135 is a 350mA current regulator designed for LED driving, and has good reviews on here. It's >90% efficient and has a 0.1V dropout voltage. The only problem is...

Hi all! I'm Dave, 19, and from the UK. I'm a bit of a physics geek - currently in my 2nd year studying astrophysics at university. I love all things optical, especially lasers and came across this forum when trying to find out how to build a 405nm laser.. and found all the info I need :D Just...