Laser tagging (homemade laser tagging game)

Started by Bart Bervoets in sci.electronics.basics11 years ago 5 replies

After playing laser tagging for a few weeks, i was wondering if it would be possible to design a simple version of the equipment for practice...

After playing laser tagging for a few weeks, i was wondering if it would be possible to design a simple version of the equipment for practice purposes. Pulsing a laser pointer should be not so hard but i'm not so sure of the receiver end. Ideal would be the following: Sender, laser pointer built into toy gun, trigger will allow pointer to pulse for a quarther second and then go off, r...


Need way to detect laser

Started by clan...@yahoo.com in sci.electronics.basics11 years ago 9 replies

What can I use to detect a laser that is being pointed at a point? It can't be visual. The laser is going to be about 12 feet max from...

What can I use to detect a laser that is being pointed at a point? It can't be visual. The laser is going to be about 12 feet max from the point to be aligned. I'm moving a large tank as I try to aligne and thought if I put something on the closest end to laser with a small hole this would insure the tank was aligned when the laser was pointed at the other end. I am trying to align the s...


TTL input circuit to drive diode

Started by Gary H in sci.electronics.basics11 years ago 5 replies

Hi. I need a little help with something that should be pretty basic. I have a control board that has a TTL output to turn on and off a laser. ...

Hi. I need a little help with something that should be pretty basic. I have a control board that has a TTL output to turn on and off a laser. The laser is nothing more than a diode that consumes about 60mA. So, I want to be able to turn the diode on or off with the TTL output. I don't really know much about TTL requirements. But, would a NPN transistor with resistor between the bas...


spectra physics 255 exciter and laser

Started by Joe in sci.electronics.basics11 years ago 14 replies

We have one of these at the University I am attending, and it seems to have stopped working. My professor was going to demonstrate the optical...

We have one of these at the University I am attending, and it seems to have stopped working. My professor was going to demonstrate the optical amplifier concept in our lab, but the cavity doesn't seem to lase. It turns on for a few flashes, then fades and turns off. It is vintage 1970's. I think it's the laser, as it has the same symptoms as my old He-Ne had when it died, but he thinks ...


Blocking Capacitor

Started by Ryan in sci.electronics.basics11 years ago 3 replies

Hi all, I am running a laser diode off a varialbe pulsed current source with a variable current output and pulse width. I want to run my...

Hi all, I am running a laser diode off a varialbe pulsed current source with a variable current output and pulse width. I want to run my laser at 1mA or less, however the current driver is designed for high power current applications and on switch on with no selected current output it has a 6mA d.c. offset. In other words there is a 6mA floor to the lowest current I can drive the lase...


SoldersSmoke#46: Amplifiers, Oscillators, Lasers, Comets, Planets, Telescopes, MAILBAG

Started by Anonymous in sci.electronics.basics11 years ago

SolderSmoke! A SHOW FOR ELECTRONICS HOMEBREWERS! http://www.soldersmoke.com Listen at: http://www.soldersmoke.com SolderSmoke...

SolderSmoke! A SHOW FOR ELECTRONICS HOMEBREWERS! http://www.soldersmoke.com Listen at: http://www.soldersmoke.com SolderSmoke #46 January 13, 2007 --Mike's oscillator work. --Michigan Mighty Mite. --Lasers, diodes, and Einstein. --Laser communication experiment. --W7ZOI-KL7R QSO on SKN. --M0HBR's feedback amps. --The new comet. --Saturn, Jupiter and calculation of c. --17 met...


Varying a pen laser voltage with audio signal how? tia sal2

Started by temp...@temp.com in sci.electronics.basics10 years ago 15 replies

Varying a pen laser voltage with audio signal how? Greetings All I'm trying to vary the voltage of a pen laser by using audio frequencies...

Varying a pen laser voltage with audio signal how? Greetings All I'm trying to vary the voltage of a pen laser by using audio frequencies (homemade analog switch /potentiometer I guess). I've created a laser that will transmit audio http://www.scitoys.com/scitoys/scitoys/light/light.html#laser_communicato r but I'm not sure how to fine tune it. I would like to have the audio co...


Almost Free Electronics

Started by New and used Electronics in sci.electronics.basics10 years ago 3 replies

Grand opening at www.amirelectronics.com. Electronics including printers, copiers, scanners, fax machines, shredders, CD players, Laser ink...

Grand opening at www.amirelectronics.com. Electronics including printers, copiers, scanners, fax machines, shredders, CD players, Laser ink cartridges toners, Mini chopper, computer accessories and a lot more at very affordable price.


Generation of Ultrasound in the Megahertz region

Started by Joe in sci.electronics.basics10 years ago 18 replies

Hello to the group, Does anyone know how I could generate sound waves in the Megahertz region? I would like to do a demonstration for my class...

Hello to the group, Does anyone know how I could generate sound waves in the Megahertz region? I would like to do a demonstration for my class on the Bragg Effect (a non linear optical effect where a high frequency sound wave will couple with a laser beam and cause the optical beam to diffract and even possibly deflect, in the right medium). It is part of our study of non linear optical ...


Remote controlled laser pointer?

Started by Mitch in sci.electronics.basics10 years ago 6 replies

I'd like to have this for a magic trick: A laser pointer rigged to go on and off by remote control. Is there a remote-controlled relay that I...

I'd like to have this for a magic trick: A laser pointer rigged to go on and off by remote control. Is there a remote-controlled relay that I could wire into the switch ?


laser

Started by oscar in sci.electronics.basics10 years ago 3 replies

Is there any conection between laser and infra red? Or rather can you reproduce IR in laser form?

Is there any conection between laser and infra red? Or rather can you reproduce IR in laser form?


is it possible to measure the magnetic flux / magnetic field from a laser? tia sal2

Started by temp in sci.electronics.basics10 years ago 1 reply

Greets All is it possible to measure the magnetic flux / magnetic field from a laser? If so what type of equipment would I need? tia sal2

Greets All is it possible to measure the magnetic flux / magnetic field from a laser? If so what type of equipment would I need? tia sal2


software used to make the laserprinter PCB etch resist images ?

Started by robb in sci.electronics.basics10 years ago 39 replies

what software is best used to make the images for the DIY laser printer PCB resist trick ? ie. print image on the laser printer, iron on...

what software is best used to make the images for the DIY laser printer PCB resist trick ? ie. print image on the laser printer, iron on copper cover board, wash away paper, disolve exposed copper, remove the plastic, drill holes ..... thanks for any help, rob


exists an etch resistant pen from corner drugstore/office supply ?

Started by robb in sci.electronics.basics10 years ago 39 replies

trying to touch up and fill in slight mishaps/gaps with DIY "laser jet" to PCB transfer resist ? after the transfer .... so i was...

trying to touch up and fill in slight mishaps/gaps with DIY "laser jet" to PCB transfer resist ? after the transfer .... so i was wondering what to use to touch up the transfered resist trace image ? are there any "brand" ink/pigment pens at local office supply or corner drug that is known to work for this application ? thanks, rob


Need help to modify circuit to work with scanning laser

Started by Anonymous in sci.electronics.basics10 years ago 2 replies

Hi, This circuit was designed for me a couple of years ago to detect an interruption in a static laser beam by a photocell. +5>...

Hi, This circuit was designed for me a couple of years ago to detect an interruption in a static laser beam by a photocell. +5> ---+-------------+ | | [68k] [LDR] +---[1M]--+ | | | | | +----+---|+\ | | | | > --+----> OUT [100K]


Need help in understanding a circuit

Started by Anonymous in sci.electronics.basics10 years ago 2 replies

Hi, I'm relatively new to electronics and I'm trying to understand the following circuit: http://elm-chan.org/works/vlp/ldpctl2.png It's...

Hi, I'm relatively new to electronics and I'm trying to understand the following circuit: http://elm-chan.org/works/vlp/ldpctl2.png It's to control a laser galvanometer X/Y. I see that a 12-bit DAC is being used to create the output voltages, but why are they then passed through an op-amp (TA75072) stage? Also is the following multiplexer (TC74HC4053) only to provide "emergency o...


How do I convert ac voltage to +, - and GND differential

Started by Anonymous in sci.electronics.basics10 years ago 8 replies

I have a controller circuit that outputs 10V peak to peak AC on a single wire. I need to convert this to 3 lines - GND, +5v and -5v for input to...

I have a controller circuit that outputs 10V peak to peak AC on a single wire. I need to convert this to 3 lines - GND, +5v and -5v for input to a laser galvanometer amp. (This is all low current stuff). I was told that either a differential chip will do the job, or an op- amp wired as an invertor. Can someone suggest either a suitable chip, or show me how I wire an op-amp up to do this?...


Can someone explain this (simple) schematic

Started by Kasterborus in sci.electronics.basics10 years ago 5 replies

Hi, This is a schematic I've been given for a laser detector circuit. The laser is being pulsed at about 600Hz and the 'PD' (photodiode)...

Hi, This is a schematic I've been given for a laser detector circuit. The laser is being pulsed at about 600Hz and the 'PD' (photodiode) is supposed to detect reflected light from this laser: http://www.flickr.com/photos/20929480@N03/2037052153 The last stage is a comparator - but not well labeled. I think that the inverting input is taking a copy of the TTL 600Hz clock pulse that is ...


Looking for a circuit to convert DAC output to +/-5v range...

Started by Kasterborus in sci.electronics.basics10 years ago 3 replies

Hi, I recently got the TLV5618 DAC working with an Ardiuno board. So I can now output signals in the 0 to 5v range. I would like to use...

Hi, I recently got the TLV5618 DAC working with an Ardiuno board. So I can now output signals in the 0 to 5v range. I would like to use these signals to control a laser galvanometer that requires -5 to +5v signal range. I've been trying to scale and translate the signal using a TL082 op- amp, but not been successful so far - can anyone show me how I can convert the signal into the requi...


Help, Laser Communicator

Started by amdx in sci.electronics.basics10 years ago 7 replies

I'm helping my son make a laser communicator. It uses a cheap laser pointer and a Radio Shack 1000ohm to 8ohm audio transformer. The 1000 ohm...

I'm helping my son make a laser communicator. It uses a cheap laser pointer and a Radio Shack 1000ohm to 8ohm audio transformer. The 1000 ohm side is in series with a battery and the laser diode, the 8 ohm side is driven by a radio. The receiver is a Cadmium Sulfide sensor (CdS) in series with a 9v battery in series with the input of an amplifier. This all worked fine. But I looked ...