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 ...


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...


Can I buffer the effects of inrush?

Started by Jay Levitt in sci.electronics.basics10 years ago 21 replies

I have a relatively-ginormous Xerox 7750DN color laser printer, rated 12A. I bought it when I was living in a large house, where it had its own...

I have a relatively-ginormous Xerox 7750DN color laser printer, rated 12A. I bought it when I was living in a large house, where it had its own closet and its own 20A circuit; it worked great there. Now I live in an apartment, and any time it powers up, any lights on the same circuit will dim and flicker - even fluorescent ones, which I don't get, but whatever. Worse, even in its "sleep mod...


Codewheel Generator for Homebrew Optical Encoders

Started by Tom2000 in sci.electronics.basics9 years ago 29 replies

Howdy, Folks, I just released a freeware Win XP/Vista program that generates codewheel images and prints them to any home inkjet or laser...

Howdy, Folks, I just released a freeware Win XP/Vista program that generates codewheel images and prints them to any home inkjet or laser printer. With a good codewheel in hand, you can build your own optical encoder. I tried to generalize the program to provide wheels for any application. "Canned" wheel types are Unencoded (for single-track quad encoders), Unencoded with Index Track ...


Photodiode amplifier

Started by Ray Xu in sci.electronics.basics9 years ago 11 replies

Hi, I am having trouble making the receiver part for my laser range finder, but I do have a head start (FYI, I am not an analog person)....

Hi, I am having trouble making the receiver part for my laser range finder, but I do have a head start (FYI, I am not an analog person). Currently, on my board, I have a PNZ334 photodiode connected to a current to voltage converter (using a op-amp; feedback is 100K), and connected to 2 stages of amplification (I THINK that they are 15x and 100x). The problem is in the current to voltage co...


PCB Toner transfer?

Started by Hammy in sci.electronics.basics8 years ago 13 replies

I have a HP LASER JET 1018 that the toner is running out. I see staples and the regular chains sell replacements for in excess of $100.00....

I have a HP LASER JET 1018 that the toner is running out. I see staples and the regular chains sell replacements for in excess of $100.00. That is more then what I paid for the printer $48.00. I was wondering if anybody tried any of these discount toners like this. http://www.123inkcartridges.ca/hp-toner-cartridges/Laserjet-1018.html This is only $25.00. If they have does it stil...


Simple Laser Diode APC circuit

Started by Ecnerwal in sci.electronics.basics6 years ago 2 replies

APC...Automatic Power Control Lots of complex hoo-ha out there for this. I'm trying to simplify, using the LM317 since I like it and have...

APC...Automatic Power Control Lots of complex hoo-ha out there for this. I'm trying to simplify, using the LM317 since I like it and have them on hand. Costs a few cents more than a transistor solution, but low component count and built-in protection, as well as supply voltage range are nice. Plus I already have one in use for the dumb (constant current, non-APC) version of this circu...


Trying to Find Class 1 Laser Diode

Started by Patty in sci.electronics.basics6 years ago 20 replies

I need to make a laser pointer for a profoundly disabled friend. It needs only to point 3 inches so I'm looking for a Class 1 laser diode that...

I need to make a laser pointer for a profoundly disabled friend. It needs only to point 3 inches so I'm looking for a Class 1 laser diode that will be safe for him despite his erratic movements. Any help in locating a Class 1 laser diode that would be appropriate would be REALLY appreciated. Thanks. Trish


Projector

Started by BeeJ in sci.electronics.basics6 years ago 3 replies

OT ? But you tech guys probably have some good suggestions. I don't need some biased sales person telling me anything. I want to set up a...

OT ? But you tech guys probably have some good suggestions. I don't need some biased sales person telling me anything. I want to set up a projector to view Blu-Ray DVDs. Room is of sufficient size. So I need one that: Very Bright High Resolution Very Reliable Costs less than $5K Other considertions? Is there one per above that is LED or laser driven rather than lamp....


Arduino choices

Started by Ivan Vegvary in sci.electronics.basics5 years ago 23 replies

Want to buy an Arduino. Too many choices that I don't understand. Prices = all seem to be nearly the same. Arduino will be used by a small...

Want to buy an Arduino. Too many choices that I don't understand. Prices = all seem to be nearly the same. Arduino will be used by a small group of high school students to build a "p= ick and place" robotics arm. School has a 3D printer and a laser cutter. = We also have lots of motors and servos from VEX robotics kits. We could us= e the VEX controllers but I would like the students t...


Where Is the Laser Sinking the Heat?

Started by Bret Cahill in sci.electronics.basics5 years ago 5 replies

If anything goes wrong with a non air breathing high energy density battery or any high energy density energy storage material it simply becomes...

If anything goes wrong with a non air breathing high energy density battery or any high energy density energy storage material it simply becomes an explosive and there hasn't been any clever way to get around this fact. A tiny flaw releases some energy and that area immediately heats up to 5,000 degrees vaporizing anything in its way until there's nothing left but a crater. If the entire ...


finding laser diode parameters

Started by Chris in sci.electronics.basics2 years ago 14 replies

I made a bulk purchase of red laser diodes off Ebay. There are three bags together unmarked. 25 of them are 3.3V., another 25 are 4.5V and the...

I made a bulk purchase of red laser diodes off Ebay. There are three bags together unmarked. 25 of them are 3.3V., another 25 are 4.5V and the other 25 are 5V. But like I say they're not labelled so I don't know what spec correpsonds with which batch. They're all in brass hosts with adjustable lenses. Is there a simple way to tell which is which - establish safe working current and volt...