Basics

Driving large numbers of relays
I am a microprocessor programmer specializing in the Zilog Z8 family. In the past I have done several boards for controlling high speed processes. I like the Z8 because of its large number of registers and on chip features. My current project will use the Z8F6421. I am working on a board that will control green... 2 Feb 2010 16:20

Analysis- With an Introduction to Proof, 4-E-Instructors SM is available at affordable prices. Email me at instructors.team[at]gmail.com if you need to buy this. All emails will be answered ASAP.
Analysis- With an Introduction to Proof, 4-E-Instructors SM is available at affordable prices. Email me at instructors.team[at] gmail.com if you need to buy this. All emails will be answered ASAP. ... 2 Feb 2010 16:20

LEDs as photo diodes
Hi seb! I used LEDs experimentally as photo diodes, yielding up to 1,4V with green LEDs when near a 60W incandescent light bulb. Right now I put 10 LEDs in series to get higher voltages, but the voltages don't add?! All I get is a voltage similar to the individual voltages - up to about 400 mV with yellow LEDs. ... 2 Feb 2010 16:21

Low Power Satellite Based Laser / Imaging System Could EasilyTrack Activity Disturbing Cheap Reflecting Fibers
J. Clarke wrote: Bret Cahill wrote: Shine a 4 milliwatt 645 nm wavelength dollar store pet laser onto a red reflector lens at night and it explodes into color. Slender reflective fibers would easily reflect a relatively low power satellite based laser a couple hundred miles back to the ... 2 Feb 2010 16:19

Phil Allison is teaching class
Phil Allison is champing at the bit to show us all how to design a small 10 watt amp. OK, now over to you... ... 2 Feb 2010 16:20

Low Power Satellite Based Laser / Imaging System Could Easily Track ?Activity Disturbing Cheap Reflecting Fibers
In sci.physics Bret Cahill <Bret_E_Cahill(a)yahoo.com> wrote: Shine a 4 milliwatt 645 nm wavelength dollar store pet laser onto a red reflector lens at night and it explodes into color. Slender reflective fibers would easily reflect a relatively low power satellite based laser a couple hundred miles back ... 27 Jan 2010 22:49

Low Power Satellite Based Laser / Imaging System Could Easily Track Activity Disturbing Cheap Reflecting Fibers
Shine a 4 milliwatt 645 nm wavelength dollar store pet laser onto a red reflector lens at night and it explodes into color. Slender reflective fibers would easily reflect a relatively low power satellite based laser a couple hundred miles back to the satellite and show up on satellite imaging. A very weak magnet... 5 Feb 2010 18:26

Discussing audio amplifier design -- BJT, discrete
I'd like to take a crack at thinking through a design of an audio amplifier made up of discrete BJTs and other discrete parts as an educational process. I imagine this will be broken up into three sections; input transconductance, transimpedance VAS, and output driver. But other arrangements (such as combining ... 2 Mar 2010 20:23

Watch replacemnt (button) batteries?
Have just replaced watch button battery from a package of five bought yesterday. The replacement cells are SR60W 1.55 volts. (Diam 6.8mm, depth 2.15mm.) Measured the removed battery (several years old now) open circuit, using a high input impedance DMM, at 1.486v. Doesn't seem that low? But that's off-load and ... 2 Feb 2010 16:20

PCB Design services
PCB Design services company, Designed hunderds of PCBs for applications including Military, Aerospace, Medical and Telecom. Specialized in designing PCBs meeting stringent safety and compliance requirements. Services offered: PCB Design SI and EMI Analysis PCB Library 3D models. To know more clock here http://ww... 22 Jan 2010 02:55