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I did a LOT of math and running of 10 - 50mA will only last like 20-40 hours, which is too substantial for a real design. Anyway, I figured out how to pulse and am investigating monostable multivibrators/missing-pulse detectors, I think I got this figured out. And laser bee is definitely...

Ok I have a new problem, I want the laser to run off a battery and it needs to do this continually without eating up battery power, which means I need to somehow pulse the laser so that it will draw less power from the batteries....I was looking into 555 timers and then I realized that if I...

Thats pretty cool, I used a DMM and I got a 1.6 V read using the green LED with my 30mW laser, I only got a .4 V read from my 1mW red laser on the red LED but this might be because the batteries appear to be dying in the laser, the intensity of the beam is low, etc. I am going to try and design...

I believe hes referring to the idea that, once you set the alarm off it still set off until it is reset.

Does the PHR805 use the same amount of current?

its a shame hightechdealz and modwerx don't sell PHR803T's that are already inside the modules. I don't think either sells PHR803Ts anymore

Enough said.

I was using a screwdriver and a hammer and it wasn't budging, I had it mounted in a "third hand" vice thing. Whoever put it in, got it in Really good...I guess I will keep trying to smack it out later, but I tried for a good 10 minutes.

I can find the sleds all over the place on E-bay and stuff, it would just be nice to buy a module and a phr803t in the same spot so I don't have to pay a lot of shipping, Plus it would be cool if the PHR803T came in the module since i've never actually extracted a diode from a sled and put it in...

I can't find any of these on the internet anymore [PHR803T in Module), I burnt out my old one and apparently the PHR803T is stuck in my curent Aixiz module and I can't seem to get it out, so I preferably want one in a module. I've tried hammering it out to a lot of other methods, if anyone...

I bought an LD (PHR803t) pre-embedded in an Aixiz module from hightechdealz about 2 years ago and I can't get the broken laser diode out of the module. (it broke from excessive use) I tried smacking it out with a hammer, etc. Does anyone have any suggestions on how to get this bugger out.

I was experimenting with these LEDs i had and I was trying to get a voltage reading from them by pointing a 1mW laser pointer at it and I wasn't noticing a difference, I am also using an analog multimeter... Is the voltage difference really small? Then, i decided to use a 30mW green laser with...

I wish i saw that earlier, but I already ordered the http://www.dealextreme.com/p/red-laser-module-focusable-dot-3-5v-4-5v-16mm-5mw-5914 Too bad I don't know the wavelength, shouldn't be an issue though. If there is anything wrong with my purchase let me know @_@

$3.95 - Red Laser Module - Focusable Dot (3.5V~4.5V 16mm 5mW) - Red Lasers

OK i ordered the LD the previous post suggested, going to start getting to work on the Trigger since the laser wont come for a while. =) Completely forgot you can use LEDs as photo-detectors

Your trigger circuit looks pretty similar to the one I started to come up with in my head, except I am confused because where is the detector, what I would think is the detector is labeled as a red LED, and i can't tell where the "photons" are ponted towards I appreciate everyone's help with...

I saw that, the depressing part is that it comes with the driver already so all you need is a voltage source of about 3-5 V, which takes the fun out of making the LM317 Driver...(I already bought all the stuff :'( ) It is still an option though.

The reason i want a low wattage from the laser is because I don't want it to be a potential hazard to some doofus who decides to stick their eye up against the laser. I am aware that intensity isn't an issue, 1mW from a red laser can cause a resistance increase from 0.4 up to 250 ohms, etc...

I wanted to make the driver for a low power Laser Diode using the LM317 instead of being a cop-out and purchasing a pointer. I wanted to hook it up to a toggle switch as well. Greater than 5mW is acceptable but I don't want to be accidently damaging peoples eyes in 0.01 seconds with a 100mW...

So I am trying to work on a laser tripwire that will sound off some sort of alarm or trigger system. I am trying to decide what sort of laser diode to use, I am most likely going to go with a 650 nm or somewhere in that spectrum. I have built a burning laser using the PHR803T and it came in...