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PC controls light dimmer
08/19/99 EDN-Design Ideas Control one light dimming from PCUsing the simple circuit in Figure 1 , you can control the light intensity in your room or work area from your PC. The heart of the circuit is a low-power D/A converter that converts digital words from a computer's parallel port to analog-voltage signals. Design by Afshin Mellati PC Electrically Isolated RS422 Interface using SN75176B or MAX485
This interface circuit provides electrically isolated RS422 communication interface to the PC serial port the isolation circuit protect the PC from direct connection to hazardous voltages. __ Designed by M Asim Khan asimkhan @ sat.net.pk
PC Electrically Isolated RS485 Interface using MAX487 or SN75176B
This interface circuit provides electrically isolated RS485 communication inteface to the PC serial port the isolation circuit protect the PC from direct connection to hazardous voltages. __ Designed by M Asim Khan asimkhan @ sat.net.pk
PC Games Port Tester
So your joystick dosen't work? Is it the games port, a software problem or the joystick itself? This simple device will tell you if the games port is OK.__ SiliconChip
PC hardware Monitor reports the weather
01/18/01 EDN-Design Ideas You usually use PC hardware monitors to keep a close eye on powersupply voltage levels, the speed of system cooling fans, and even the temperature of the CPUPDF has several circuits, scroll down. Design by Sean Gilmour, Analog Devices, Limerick Ireland
PC I Express Power & Mini Card Solutions
DN346 Design Notes__ Linear Technology/Analog Devices
PC I PIO Board
An experiment of the PCI board to build with generic parts, such as a GAL and TTL logics. PCI is a industrial standard bus on the parsonal computers. But nobody tries to build the PCI board personaly, so I tried it. And it had been completed with successful :-) __ Designed by The Electronic Lives Manufacturing-presented Chan
PC MCIA Card & Card Socket Power Management
AN60 Most portable systems have expansion sockets conforming to the standards set by the Personal Computer Memory Card International Association (PCMCIA). This standard requires the host to perform an unusual amount of switching on both the VCC and VPP voltage lines. Card designers face difficult power management and DC/DC conversion issues of their own. Board real estate and component height are at a premium making design difficult and component selection critical. This App Note discusses in detail both the host and card designer issues and highlights several new products designed specifically for these applications. __ Linear Technology/Analog Devices
PC MCIA Socket Voltage Switching Design Note 93
DN93 Design Notes__ Linear Technology/Analog Devices
PC Monitors two-way RS-232 transmission
02/01/01 EDN-Design Ideas The goal of monitoring transmission in a data link is obvious: You want to know the contents of the data, when it was sent, and by whom. If one of the communicating parties is a PC or another user-programmable controller, then you can modify parameter settings or, at worst, change transmission routines to generate log files or perform other actions. Design by Jerzy Chrzaszcz, Warsaw University of Technology, Poland
PC Multimedia Speakers
This circuit of multimedia speakers for PCs has single-chipbased design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance.At the heart of the...__ Electronics Projects for You
PC parallel port eight DC power switch cam driver two unipolar stepper Motors, lights etc
On this circuit there are eight DC power switch you can open or close through PC parallel port: you can use it to drive two unipolar stepper motor or eight electric light bulb or DC motors. Digital interface to PC uses optocouplers for safety reasons and you can connect up to six circuits to a single LPT, driving up to twelve step motors or 48 bulb: see iso-buffer for an in deep description. __ Designed by © Vincenzo Villa
PC Parallel Port Output Capabilities
includes instructions how to connect a relay to PC parallel port __ Designed by Tomi Engdahl
PC Parallel Port Wizard
This simple gizmo can test your PC's parallel port. It can also teach you a lot about the way parallel ports operate.__ SiliconChip
PC Printer Port Controls Frequency Divide
06/09/94 EDN-Design Ideas In Fig 1's circuit, two cascaded synchronous presetable binary counters, IC1 and IC2, can derive signals having a frequency of fCLK/N. In the circuit, a simple oscillator generates fCLK; however, you can substitute any triggerable source. Design by Bogdan Manolescu, Microelectronica, Bucharest, Romania
PC Printer Port Programs AT89C5
EDN-Design Ideas 10/24/96 The simple PC printer-port interface programmer in Figure 1 can program an Atmel AT89C51 flash-based mC. The circuit uses the eight data-port lines (pins 2 to 9) and three control-port lines (pins 1, 14, and 16). The control-port bits, D0 and D1, act as reset and clock signals, respectively, for the 12-bit binary counter, IC2. Design by Hong Yu Qing, TD Inc, Tongling, China
PC Programs PROM Simulator
01/20/94 EDN-Design Ideas The circuit in Fig 1 emulates 8-kbyte PROMs, such as the 2764. The programs in Listings 1 and 2 allow you to download a PROM program to the emulator via a PC's serial port. Design by Shwang-Shi Bai, Chang-Shan Institute of Technology, Taiwan, ROC
PC records four-channel waveforms
05/25/00 EDN-Design Ideas This design idea is a sequel to a previous one, "Use a printer port to record digital waveforms, " EDN , June 18, 1998, pg 136. Both ideas are similar: Use the PC's printer port to sample waveforms, and use the PC's memory to stor Design by Dean Chen, Dycam Inc, Chatsworth, CA
PC RS422 Interface
Isolated RS422 adapter for PC serial port by M Asim Khan, Pakistan. __ Designed by Wichit Sirichote
PC RS485 Interface
Simple and easy build RS232C-RS485 converter designed by M Asim Khan, Pakistan. __ Designed by Wichit Sirichote
PC 's printer Port measures frequency
10/26/95 EDN-Design Ideas You can plug the circuit in Fig 1 into a PC's printer port to measure frequency. The circuit needs no external power supply, measures frequencies from 1 Hz to 5 MHz, and displays the results on screen. IC1 (CD4536) is a 16- or 24- Design by Yongping Xia, EBT Inc, Torrance, CA
PC 's RF stage Design: tackling the trade offs
11/21/96 EDN-Design Feature Building Effective RF design requires that you carefully manage trade-offs. You'll have to accept less-than-optimum performance in some dimensions to achieve your primary objectives. Design by Bill Schweber, Technical Editor
PC 's Serial Port Controls Programmable Sine Wave Generator
01-Oct-06 EDN Europe This design idea describes a circuit that uses a PC’s serial port to control a sine-wave generator that covers a frequency range of 2 Hz to 20 kHz in 1-Hz steps(Figure 1). The circuit’s output voltage of approximately 2.2V p-p remains Design by Yongping Xia, Navcom Technology, Torrance, California
PC Securely Controls Relay
11/23/95 EDN-Design Ideas When a PC-driven solid-state or electromechanical relay controls external equipment, take care to design an interface that avoids false triggering. The interface circuit in Figure 1a switches the relay on and off only after a specific sequence of outputs. Thus, this design protects the relay against the influence of computer-reset and I/O operations that some drivers perform during system start-up to locate add-on cards Design by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw University of Technology Warsaw, Poland
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