group photo

Started by Anonymous in sci.electronics.design5 months ago 17 replies

https://www.dropbox.com/s/m8zc7g56jul39d0/NIF_Tour-Highland%20Tech%20group%20photo%20TC.jpg?raw= 1 We got a tour of the NIF laser. That's the...

https://www.dropbox.com/s/m8zc7g56jul39d0/NIF_Tour-Highland%20Tech%20group%20photo%20TC.jpg?raw= 1 We got a tour of the NIF laser. That's the target chamber behind us. On that spot, a Star Trek episode was filmed. https://en.wikipedia.org/wiki/National_Ignition_Facility After 20 years of operation, and roughly 8000 shots, they keep making progress, in the sense of learning stuff and gett


Apex HV opamp issues.

Started by George Herold in sci.electronics.design8 years ago 50 replies

Hi guys (and dolls), So if you read in JL's TI opamp thread, I am having noise issues in our laser diode. I turns out (I think) that the extra...

Hi guys (and dolls), So if you read in JL's TI opamp thread, I am having noise issues in our laser diode. I turns out (I think) that the extra noise is coming from my Piezo drive. The original circuit used a PA141 from Apex. (I can't find a schematic on-line, but I have a hard copy.) Several years ago this HV opamp went away and the recommended replacement from Apex was the PA314 http...


Crystal Controlled Oscillator

Started by Artist in sci.electronics.design11 months ago 53 replies

I have been tasked with designing a piezoelectric actuator driver at its resonant frequency. This is to replace an arrangement where the sine...

I have been tasked with designing a piezoelectric actuator driver at its resonant frequency. This is to replace an arrangement where the sine wave source is a function generator chip (the obsolete XR-2206) that must be individually tweaked on a unit, by unit basis, to match the crystal?s resonant frequency. The crystal is used as an actuator to vibrate a mirror used in a laser syste


Aluminum-core PCB cost?

Started by Phil Hobbs in sci.electronics.design5 years ago 33 replies

I have a customer who wants me to do an extreme shrink of our semi-custom diode laser controller board, which leads to a lot of thermal...

I have a customer who wants me to do an extreme shrink of our semi-custom diode laser controller board, which leads to a lot of thermal issues. The obvious approach is an aluminum-core circuit board, but I've never used one. A few questions for the cognoscenti: 1. Can I get a 6- or 8-layer aluminum-core PCB? 2. How much more do they cost? 3. Any other constraints? Thanks ...


Highly Flexible Cable

Started by Ricketty C in sci.electronics.design2 years ago 23 replies

We are going to need a highly flexible cable on this vent project if we mount a switch on the motor arm. The arm swings through up to a 90 degree...

We are going to need a highly flexible cable on this vent project if we mount a switch on the motor arm. The arm swings through up to a 90 degree angle with most often a 60 degree angle. I know there are special cords that provide for this sort of flexing. They use cables to connect to printer heads in 3D printers and laser cutting devices. What do they use. -- Rick C. - Get...


Fusion Based Electricity Is Now A Reality

Started by Fred Bloggs in sci.electronics.design1 year ago 29 replies

Laser induced fusion of hydrogen and boron into helium: "A nuclear reactor without chain reactions, radiation or radioactive waste? Marvel...

Laser induced fusion of hydrogen and boron into helium: "A nuclear reactor without chain reactions, radiation or radioactive waste? Marvel Fusion from Munich promise exactly that: lasers designed to heat hydrogen and boron so that they fuse into helium. A lot of energy is released during this fusion. But nothing else, no radiation worth mentioning, about the same amount as in a radi


picosecond test points

Started by John Larkin in sci.electronics.design11 years ago 70 replies

We're designing some laser driver boards, and I thought it would be cool to add test points to some of the interesting circuit...

We're designing some laser driver boards, and I thought it would be cool to add test points to some of the interesting circuit nodes. Regular scope probes don't work at ps speeds, and probe grounding is difficult. There are multi-GHz active probes, at roughly $1 per Hz. So I was thinking that I could add a small, 0603 maybe, resistor to a signal to be snooped, run a 50 ohm trace some sm...


cotton-pickin Pulse Picker

Started by Winfield Hill in sci.electronics.design6 years ago 23 replies

Some reading for a lazy Sunday afternoon. A typical femto-second laser might give 65kW 0.1ps light pulses at a rate of 80MHz. But some...

Some reading for a lazy Sunday afternoon. A typical femto-second laser might give 65kW 0.1ps light pulses at a rate of 80MHz. But some applications can't handle a powerful light pulse every 12.5ns, for example fluorescence-lifetime measurements (we don't want to re-excite any molecules before achieving 100% decay). The solution is to add a light modulator, and run it from a pulse-picker. ...


Optomechanical accelometry for inertial navigation

Started by Joe Gwinn in sci.electronics.design1 year ago 4 replies

I recently attended a lecture on Optomechanical accelometry for inertial navigation, from NIST (National Institute for Science and Technology in...

I recently attended a lecture on Optomechanical accelometry for inertial navigation, from NIST (National Institute for Science and Technology in the US). It's very clever, probably an advance in the art. They are at the noise floor for such devices. One fundamental limitation they mentioned was "laser noise" causing a 1/f noise peak at low frequencies. This rang a bell - didn't Phil H...


strange blue laser optics

Started by John Larkin in sci.electronics.design3 years ago 42 replies

I got a couple of these, to maybe cure UV-set...

I got a couple of these, to maybe cure UV-set epoxy. https://www.ebay.com/itm/High-Power-Purple-405nm-Pointer-Burning-Light-Beam-Pen-with-Battery-Cha rger-USA/383162483108?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 It came with a big lithium battery and a charger. Two weird things: If I shoot it at a white wall, I can see the spot with my right eye, but not with my


Nice MCU for small jobs

Started by Phil Hobbs in sci.electronics.design4 years ago 96 replies

LPC804: 15 MHz Cortex M0+, 32kB flash, 4k RAM, 12-bit 2 us ADC with 1 LSB DNL, 10-bit DAC, the usual serial stuff, 20-TSSOP: 67 cents in...

LPC804: 15 MHz Cortex M0+, 32kB flash, 4k RAM, 12-bit 2 us ADC with 1 LSB DNL, 10-bit DAC, the usual serial stuff, 20-TSSOP: 67 cents in reels, dev board $27. We're using it for a super-quiet diode laser controller where it will run the temperature control and automatic power control loops. I'll never use another ATmega. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principa...


nice enclosure

Started by John Larkin in sci.electronics.design3 years ago 30 replies

...

https://www.dropbox.com/s/a88dfus3z1wrjii/P900_Box_1.jpg?raw=1 https://www.dropbox.com/s/6pjs77u4q8u6sr7/P900_Box_4.jpg?raw=1 https://www.dropbox.com/s/aiquxwbnwo05go8/P900_Box_5.jpg?raw=1 This was made by Protocase, to our Solidwords design and artwork. It's laser-cut aluminum with a beautiful conductive finish that looks like stainless. -- John Larkin Highland...


cleanup batch file for LT Spice

Started by John Larkin in sci.electronics.design4 years ago 8 replies

This is _Cleanup.bat rem LT Spice cleanup batch file DEL *.log DEL *.raw DEL *.op.raw -- John Larkin, President ...

This is _Cleanup.bat rem LT Spice cleanup batch file DEL *.log DEL *.raw DEL *.op.raw -- John Larkin, President Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic ...