Recent content by goamarty

For laser soldering by hand I would want a weak visible aiming laser and the goggles should not block that light too much. I think, normally laser soldering is done in automated fashion with defined pulses at defined coordinate locations.

If you put the sticker on your laser/pointer it should be able to play the corresponding discs. :-) Like you shine it on the data surface of the disc and it puts out the music through a tiny speaker - or project the video on the nearest wall. Then the laser would truely deserve the sticker. :-)

Re: Modifying a 5 mW green laser into a 100 mW las The pot mod is understandable, although unwise and the phrase "be sure, that the screw is tight" is very "untechnical" :-) But the part with "burning out" this component is completely ununderstandable. This boards are soldered by baking them at...

Partly its a problem of the meter: A thermal meter would show you true power, independent of wavelength. An optical sensor (photodiode) is much more sensitiv to IR than to e.g. green. If you calibrate it for green, than it would show you each extra mW of IR as like ten mW of green (i am not sure...

Some days later this was presented: http : //www . theregister.co.uk/2008/11/14/ weaponised_rayguns_hit_shelves_in_time_for_xmas/ you have to remove the spaces

I had this idea like 25 years ago - when I painted rockets in a science fiction scenario (without any year-number) in arts class in school. :-) But the beam was light blue, what is just my famous color. :-) and I didnt think, that somebody would try it in the near future.

No, when I open a (the right) 9V Battery, I get cells for my first ever Laser Pointer, which has something like 680nm/5mW and costed more than 70,- in 1990 or 1992. This thing uses AAAA battereis, which are found in some alkaline 9V. For the sarcasm: Its good, much better then in laserfreak.net...

Capacitors: they come in this housing (size0805) in capacities from 1pF to more than 1µF. You cant distinguish them visually, only with a cap-meter. I would use 100nF to 1µF. its not critical in this application, but 10nF or less would be pretty much useless. If you find them in an RF-circuit...

Is it really true, that this combo pointer uses two 23A batteries??? This would be 2*12V=24V! Probably with an internal resistance, that the batteries are more or less short circuited - its 22 Ohm per battery. OK, you dont need a driver for the diode ;D. But its a major waste of power!

In some article I read about "dazzler" weapons" with 500mW of 532nm. Its probably just a question of distance to call this "non permanent" blinding. But as a sobriety test he can just project a green line on the floor and tell you to walk along - spares the chalk :-) And then its all a question...

Probably the crude reduction with the series resistor is the problem. It gives you only 34mA for 3V. If it is a computer supply then you could use the 3.3V rail (batteries have a little more than 1.5V when they are fresh), or use the 5V with 3 dropping diodes. The most safe solution would be a...

Although the thread is rather old, I want to give some comments: To the inductor: In the pictures I could see, it had 18µH, at least before some part of the ferrit was broken off. Now it sure has less. To the chip: Here is the datasheet: ...here was a link to the datasheet... but the forum...

You can easy and safely test the PHR803 diode with a 9V Battery and a Resistor. The diodes lase with >31mA and can be driven up to at least 90mA. If you aim for 60mA you are safe. You take the battery voltage (9V) minus the diode voltage (4,5V) =4,5V and divide by the current (60mA) this gives...