VG Converter for Video Projectors & Fixed Frequency Monitors
This article consists of one circuits which I have designed for connecting VGA card to other display devices than just a VGA monitor. This circuits makes it possible to connect your VGA card to fixed frequency monitors and video projectors. For some applications and system combinations some additional software is needed to get the system working. __ Designed by Tomi Engdahl VGA Hardware Screen Blanker
It is a simple device that connects between your keyboard and VGA card feature connector, and will blank (or blink) the screen after a certain amount of non-keyboard activity. This device is totally software and O/S independent. The ONLY screen blanker that can be guaranteed to work! __ Designed by David L. Jones
VGA to RGB + composite sync-converter
This article consists of one circuits which I have designed for connecting VGA card to other display devices than just a VGA monitor. This circuits makes it possible to connect your VGA card to fixed frequency monitors and video projectors. For some applications and system combinations some additional software is needed to get the system working __ Designed by Tomi Engdahl
VGA to TV Converter
This article consists of one circuits which I have designed for connecting VGA card to other display devices than just a VGA monitor. This circuits makes it possible to connect your VGA card to fixed frequency monitors and video projectors. For some applications and system combinations some additional software is needed to get the system working __ Designed by Tomi Engdahl
VGA to TV Scart
This VGA to TV converter is designed to connect VGA card to a television which has suitable 21-pin AV connector for RGB input (called EURO/SCART/Peritel connector). if you Tv does not have this kind of connector, then you can't use this circuit __ Contact: IQ Technologies
VHDL procedure dynamically opens a file
12/17/98 EDN-Design Ideas (File contains many circuits. Scroll to find this one.) A simple VHDL-87 procedure opens a file whose name a command file or user conveys in runtime. You can apply this technique to the reading or writing of data, control, and status files. This procedure is useful for replacing the input stimuli file of a testbench without recompiling the code (with a different stimuli file name) or rename the stimuli file name. In addition, the procedure can write the simulation results to a file whose name consists of the input file name and any preferred extension. Design by Jacques Behar, Rockwell Semiconductor Systems, San Diego, CA
Video Clock Superimposer using PIC16c711
As a followup to my VCR Pong project, here is a gadget that is actually useful in the Real World! It superimposes the time of day, in "HH MM SS" format, in the bottom right-hand corner of an existing video signal. My friend Scott uses it with his home security system
Video Connectors
This connector is found on most Intel-PC's. It's quite easy to feed VGA-monitors with Macintosh-signals (or the other way around: attach a Mac-monitor to an Intel-PC). Most modern VGA-monitors are quite tolerant regarding vertical- and horizontal-sync frequencies.
Video/Audio Switch (8 x 8)
This is an 8-input x-output audio/video switch module to be controlled from a computer, for example fromparallel port. Each audio/video output can be switched to any of8 inputs, separately.1-module drives1-audio/video output and has a34-pin connector to plug intosystem interface. You can use video OPA-s on 4051 output instead. Note that you can get full integrated video multiplexers from Maxim __ Designed by Peter Jakab
Visual & Audible Monitor for Electronic Interfaces
Introduction Most of the modern PCs and embedded systems have digital interfaces as RS232, printer ports, LIN, etc. for exchanging of commands and data with intelligent peripherals.Figure 1 is showing typical case...__ Electronics Projects for You
Visual Basic & AVR RS232 interface
Control AVR micro-controllers via Visual Basic software. You can use some development board like MCU 100, STK200, STK500 or build your own board, following the schematic. __ Designed by Olesaether, Terie Frostad, Ingar Fredriksen, Morten W. Lund, Haakon Skar, Paal Kastnes
Visual Basic Models MDAC offset
03/13/98 EDN Ideas(File has several circuits, scroll to this one) It's hard to imagine that, for such an old-hat item as a standard R-2R multiplying DAC(MDAC], there still exists some "dark area" in modeling and calculating its dc offset, VOFF, and related output resistance, RO. You can obtain some information from References 1and 2 and other references regarding the code dependency of RO and VO, but the simplified formulas Page includes
several designs. Scroll to find this one Design by Olga Belousava, Los Alamos, NM, and Alex Belousov, New York, NY
Visual Basic-models MDAC offset
02/18/99 EDN-Design Ideas NOTE
: File has several circuits, scroll to find this one You often need to control the duty cycle of a square wave. The circuit in Figure 1 works from a single 5V supply at a frequency of 100 kHz. With minor component changes, you can configure it for a range of frequencies. The circuit consists of a ramp NOTE
: sawtooth. oscillator and a comparator. The circuit compares the ramp to an externally applied voltage, VCNTRL. When VCNTRL is greater than the ramp voltage, the PWM output is 5V. The sawtooth oscillator consists of a current source NOTE
: R1, R2, R3, and Q1. , a timing capacitor NOTE
: C1. , and the oscillator-control circuitry NOTE
: R4, R5, R6, and IC1A The oscillator-control circuitry sets the upper and lower voltages of the timing capacitor at 3 and 1V. Design by Olga Belousava, Los Alamos, NM, and Alex Belousov, New York, NY
Voltage-to-pulse-width converter spares microprocessor's resources
12/01/06 EDN-Design Ideas Simple circuit uses only three components and two I/O-port pins Design by James Christensen, Kris Design Co, El Cajon, CA
Web Server In a Box, Part 1
We're very excited about this project. It will let you house your own website with possibly hundreds or even thousands of pages, all in a little box connected to the internet via your modem/router. You don't need a computer to operate and house a websitethis little box does it for you and it can be accessed from anywhere around the world, at any time, even from a mobile phone which has a web browser. In fact, it is a complete web server in a boxso we've called it WIB (Web server In a Box).__ SiliconChip
Web Server In a Box, Part 2
Last month, we introduced our new Web Server In A Box (WIB) and gave the full construction details. This month, we show you how to connect it to your modem/router and guide you step-by-step through the set-up details. We also show you how to activate a dynamic DNS service, so that you can access the WIB via the Internet.__ SiliconChip
Web Server In a Box, Part 3
In Pt.2 last month, we showed you how to connect the WIB to a network and gave the step-by-step setting-up details. Most constructors will settle for the website provided but for those with special needs, this third article is for advanced users who want to customise the WIB to their requirements.__ SiliconChip
Where is the wiper?
08/08/02 EDN-Design Ideas You enjoy significant advantages when using DPPs(digitally programmable potentiometers] with increment/decrement serial interfaces. Programming the serial interface is simple and fast, and you can adjust the potentiometer in real-time applications. The interface, however, provIdeas no information about wiper position, and this information is important in some applications Design by Chuck Wojslaw and Dave Gillooly, Catalyst Semiconductor, Sunnyvale, CA
Why do we need Mixer?
Article: The mixing of a number of audio signals is such a common thing to do that one would expect the Net to be riddled with articles on how and why signals are mixed. There are plenty of circuits that show how it can be done, but very little that explains the benefits or drawbacks of any particular scheme. __ Designed by Rod Elliott ESP
WIB: Web Server In a Box, Part 1
We're very excited about this project. It will let you house your own website with possibly hundreds or even thousands of pages, all in a little box connected to the internet via your modem/router. You don't need a computer to operate and house a websitethis little box does it for you and it can be accessed from anywhere around the world, at any time, even from a mobile phone which has a web browser. In fact, it is a complete web server in a boxso we've called it WIB (Web server In a Box).__ SiliconChip
WIB: Web Server In a Box, Part 2
Last month, we introduced our new Web Server In A Box (WIB) and gave the full construction details. This month, we show you how to connect it to your modem/router and guide you step-by-step through the set-up details. We also show you how to activate a dynamic DNS service, so that you can access the WIB via the Internet.__ SiliconChip
WIB: Web Server In a Box, Part 3
In Pt.2 last month, we showed you how to connect the WIB to a network and gave the step-by-step setting-up details. Most constructors will settle for the website provided but for those with special needs, this third article is for advanced users who want to customise the WIB to their requirements.__ SiliconChip
Wire Between Multiio Card & Joystick Connector
Some PC multi-IO cards have a 16 pin header in the circuit board which is wired to the joystick connector (fitter to other slot place) using flatcable. The wiring is straight one-to-one connection but, due to the different numbering scheme of the gameport connector vs the 16-way header, the pin numbers don't necessarily match (pin 16 in header is ocource lef not connected because joystick connector has only 15 pins) __ Designed by Tomi Engdahl
Wire Parameter Calculator
This Javascript web calculator will calculate the resistance and ampacity for copper wire based on the gauge. Both metric (mm) and American Wire Gauge (AWG) are supported. Note: Ampacity is based on a curve fit to MIL-STD-975. To see the wire table that this calculator is based on as well as important information about wire insulation temperature ratings __ Designed by Brad Suppanz
Wireless Keylogger-Do It Yourself! Part 1
Introduction Familiar with the concept of hardware keylogging? A hardware keylogger is a perfect solution for monitoring user activity, at very low risk of disclosure. A hardware keylogger is a purely electronic device, so no access to the
Wireless Keylogger-Do It Yourself! Part 2
Power-up Once you have a transmitter-receiver pair of devices assembled, it's time for the first test. We recommend to use a single computer for testing both devices. First, power down the computer and connect the transmitter unit between the PS/2
Wireless Temperature & Humidity Sensor with USB
this project is based on obdev's Remote Sensor example and their firmware-only USB implementation; the main change is the replacement of the analog sensors with a Sensirion SHT11 digital temperature and humidity sensor
Xtimer V1.0 with 4094
New design xTimer using CMOS
shift register 4094 for driving 7-segment LED directly!. __ Designed by Wichit Sirichote
XY Keypad uses µC's Serial Port
10/10/96 EDN-Design Ideas Interfacing an X-Y keypad to a microcontroller usually uses a parallel port of 8 bits or more. But with the circuit shown in Figure 1, a more efficient interface using a microcontroller's serial port reduces the number of connections required from eight to three. This interface uses the MM74C922N, a National Semiconductor keypad encoder, Design by James Mears, National Semiconductor, Tacoma, WA
Yaesu FT-897, FT-857 & FT-817 transceiver-PC interface (YFPI)
This interface is used to fully control a transceiver, from a personal computer, when operating digital amateur radio modes (made in January 2006) __ Designed by Bjarke Korsgaard
Z80 Computer
The successor to the Great Z80 Computer project. The new Z80 computer is much simplified in comparison to the original, but in many cases borrows ideas and circuits from it. When it is working I will be able to extend it as time permits __ Designed by Hans Summers
Z80 CPU NiCd/NiMH
charger computer
No Schematic __ Designed by Thomas Scherrer OZ2CPU
Zeiss OPMI-1 LED Conversion
I was lucky enough to get an old Zeiss OPMI-1 surginal microscope, with very high quality optics. Surgical microscopes differ from conventional ones in that they leave plenty of room between the subject and the microscope to work with hands and tools, which makes them ideal to work in electronics. __ Designed by Roberto Barrios EB4EQA
Zero-Power A/D Converter Uses Printer Port
07/06/95 EDN-Design Ideas You can use a desktop or laptop PC to monitor physical variables such as temperature or pressure. A convenient way to do this is to connect an A/D converter through the ubiquitous Centronics printer port[ Design by Dhananjay Gadre, IUCAA Instrumentation Lab, Pune, India
Zobel Network Tames Reactive Loads
12/21/95 EDN-Design Ideas Stability problems can arise in applications in which an amplifier must drive a reactive load. Most amplifiers can easily drive purely resistive loads with no stability problems. However, some reactive loads can cause an otherwise stable amplifier to ring severely or oscillate. A good example is an audio-power amplifier. The device’s load is a loudspeaker, which Design by David Albean, Thomson Consumer Electronics Indianapolis, IN |