PIC16f84 Debugging Terminal
Build a simple 9600 BAUD 8n1 LCD terminal for debugging and testing the projects having RS232C output __ Designed by M Asim Khan asimkhan @ sat.net.pk PIC16f84 Miniature Real Time Controller
Build a simple real-time controller with PIC16F84 running at low power X-tal 32, 768Hz. Daily scheduler for 6-channel resided in 64-byte EEPROM can easily be pre-programmed using Nigel PicProg __ Designed by Wichit Sirichote
PIC16F84 Serial I/O Expander with Picbasic
This article shows how to use the PIC16F84 microcontroller with PicBasic to design a quick & effective, serially controlled, I/O-Expander. Using PicBasic makes developing handysingle-chip devices like this extremely simple. __ Designed by © Reynolds Electronics
PIC18f2550 Project Board
The new PIC18F2550 Project Board was designed as the development platform for student projects. __ Designed by Wichit Sirichote
Pic-Plot GPIB to RS-232 converter
Get rid of dry plotter pens or unclear camera snapshots of test instruments when reporting your lab test session. This adaptor will capture plots or prints of your GPIB instrument to your PC through the serial port. __ Designed by Andrea IW9HJV and Johnny IW9ARO
Pic-Plot2 GPIB to USB converter
Pic-plot goes to USB Without any additional adapter, the new Pic-plot2 directly communicates with your PC or laptop through the USB port. Gives faster downloads from your GPIB instrument and it is self-powered from the host PC: no need of DC adaptor. __ Designed by Andrea IW9HJV and Johnny IW9ARO
Pin Diagrams
Hardware schematic that shows pin diagram for common memory & interface chips __ Designed by Wichit Sirichote
Platinum-RTD-Based Provides High Performance with Few Components
4-Sep-08 EDN-Design Ideas A low-cost and low component count circuit provIdeas an accurate output voltage from a platinum RTD Design by Jordan Dimitrov, Toronto, ON, Canada
Playing a MAC through a Standard Telephone Line
how to get sound from computer to Telephone line
PLD code reveals PC-Board revisions
10/17/02 EDN-Design Ideas The PLD(programmable-logic-device] code in Listing 1 implements a pc-board-level revision-detection system that detects whether PLD pins are shorted together on a pc board. It is often advantageous to field a single PLD programming file that works for several generations of physical hardware. The PLD needs to understand what the board revision is, so that it can enable or disable functions, pi Design by Clive Bolton, Bolton Engineering Inc, Melrose, MA
PLD Implements Fast Four-Phase Clock Generator
10/27/94 EDN-Design Ideas The circuit in Fig 1a can clock pipelined logic in PLDs by an external agent at one-half the usual frequency. You can use this circuit when designing pipelined ALUs and switched-capacitor circuits. I used this circuit to drive a 40M-sample/sec CMOS
flash Design by Said Jackson, Hamburg, Germany
PLD Solves RS-232C Compatibility Problem
01/19/95 EDN-Design Ideas RS-232C communication has many nasty, low-level problems. For example, converting one form of RS-232C bit stream to another is frustrating without a general-purpose UART.
The circuit in Fig 1 strips the parity bit out of an RS-232C bit stream. The input is a 9600-baud, 8-data bit, odd-parity, and one-stop-bit (9600,8,O,1) stream. The output is a no- parity (9600,8,N,1) stream. Design by Phil Hamory, NASA/Dryden Flight Research Center, Edwards, CA
PLDs Eliminate ISA PC-Board's Jumper
06/23/94 EDN-Design Ideas Having software ask users about base addresses for newly installed ISA-bus (industry-standard-architecture, ie, the IBM PC bus) pc board is far more elegant than requiring the users to decipher HEX address and set pc-board jumpers. GAL20R8 PLDs, programmed according to Listings 1 and 2, along with an 8-bit comparator allow software to set pc boards' base addresses. The comparator has one input tied to the ISA address bus and the other to one of the PLDs. This PLD contains a register initialized to some base address on power-on. The second PLD contains a "table" (actually, a Boolean formulation) of available base addresses. Design Vladimir Bochev, Bulgarian Academy of Sciences, Sofia, Bulgaria
PLDs Implement Delay Line
03/31/94 EDN-Design Ideas PLDs such as the Altera MAX5000 family can easily generate asynchronous delays and pulses with an edge-to-edge timing resolution of 8 nsec. Newer families can go even faster. The development-system simulator allows you to quickly and accurately design and predict the timing of the required delay patterns. However, you must be careful Design by Trevor J Preston, Astromed, Cambridge, England 03/31/94
PLDs Substitute for Obsolete Latched
06/09/94 EDN-Design Ideas The 22V10 series of PLDs in 24DIP300 or 28PLCC packages can substitute both physically and functionally for the now-discontinued 74ALS844 and 74ALS880 latches. Beware, however, that some early PLCC versions of the 22V10 do not have compatible pinouts. Listings 1 and 2 contain the PLDASM source code for 22V10s that emulate the 74AS/ALS844 and 74AS/ALS880, respectively Design by Michael A Wyatt , SSAVD Honeywell Inc, Clearwater, FL
PLL forms Simple Circuit MSK Demodulator
12/17/98 EDN-Design Ideas In minimum-shift-keying(MSK) signaling, two frequencies that differ by the bit rate represent a one bit and a zero bit. Normally, the frequency shift occurs at the peak of a cycle, so that neither the amplitude nor the slope of the waveform shows a discontinuity. We needed to transmit 300-baud ASCII text using ultrasonic transducers. These devices have a very narrow bandwidth around their 25-kHz resonant frequency, making MSK the obvious choice for modulation. A zero Page includes
several designs. Scroll to find this one Design by JTom Napier, North Wales, PA
PLL IC Forms Simple Circuit Digital Phase Shifter
01/04/96 EDN-Design Ideas A phase shifter is a vital block in some signal-processing and clock-distribution applications. Another important application is in benchmarking digital phase detectors. The circuit in Figure 1, an especially appropriate one for evaluating phase detectors, uses only two industry-standard ICs(CD4046 and LM311]. It relies on digital PLL techniques Design by Haldun Karaca, DE University Bornova, Izmir, Turkey
PLL synchronizes power-supply IC
07/16/98 EDN-Design Ideas It is often desirable to synchronize a switching power supply to a system clock or to a second supply. If the power-supply controller has no synchronization pin, you can add a low-value resistor in series with the oscillator capacitor, thereby developing a synchronizationFile has several circuits, please scroll to find this one Design by Kurk Mathews, Linear Technology Corp, Milpitas, CA
Ponyprog for ATMEL'S AVR
The ATMEL AVR programmer works with the Windows program "Ponyprog" which works under 95, 98, XP, and can be found at [url]http://www. lancos. com/prog. html[/url] On board the AVRs that can be programmed are those in the schematic. For other members of AVR family or the rest programmable ICs that Ponyprog can program, there is the J1 connector (CON10) which allows expanding the programmer's hardware. See Ponyprog's site for other's ICs Ponyprog circuits. The JUMP1 jumper is there to connect the crystal's circuitry to the 8- pin AVRs or to disconnect it. Some AVRs have internal
Ponyprog for AVR & PIC16F84
All resistors are 1/4W. The circuit is powered by 915V DC or AC. When In Circuit Programming (ISP) connectors are used, is possible the programmer to be powered from target’s power source. Diodes D2 and D6 protect the regulator LM7805, when target’s power is used. __ Designed by Kyriakos Kontakos
Power Conditioning for Notebook & Palmtop Systems
AN51 Notebook and palmtop systems need a number of voltages developed from a battery. Competitive solutions require small size, high efficiency and light weight. This publication includes circuits for high efficiency 5V and 3.3 V switching and linear regulators, back light display drivers and battery chargers__ Linear Technology/Analog Devices
Power over Ethernet Isolated Power Supply Delivers 11.5W at 90% Efficiency
DN338 Design Notes__ Linear Technology/Analog Devices
Power PC 's on chip Debug features alter embedded Development
07/16/98 EDN-Design Feature The PowerPC is one of the most talked about microprocessor families in the embedded-system market. The PowerPC's RISC architecture offers massive processing power at attractive prices. The latest member of the family—the 604e—offers a SPECINT92 of 225 at 166 MHz. More important, the companies behind the PowerPC—IBM(Armonk, NY] and Motorola(Phoenix]—appear to know what it takes to firmly position the PowerPC in the embedded market, and they have the resources to succeedFile has several circuits, please scroll to find this one[ Design by Jim Challenger, Software Development Systems
Power Reboot
Simple circuit for booting the PC base linux server. __ Designed by Wichit Sirichote
Power Supplies for Subscriber Line Interfaces
DN130 Design Notes __ Linear Technology/Analog Devices
Power Supply Converted from a PC link
This ATX PS board has leads for +5 (RED) , -5 (WHITE) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN). Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes. The fan has also been unplugged for better viewing. Since this PS was converted for use in the logic and robotics labs, the selected voltages __ Designed by Andy Batts
Power Supply Hub with Battery Charger, Quad-USB & Variable Outputs
This article presents a simple, universal low-cost power supply hub with quad-USB and variable voltage outputs, plus a battery charger. There are electronic equipment like battery chargers, electronic lamps and MP3...__ Electronics Projects for You
Power Supply-Basic UPS
This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with __ Designed by Andy Collinson
Power USB Devices From a Vehicle
11/18/10 EDN-Design Ideas Supply power to two USB devices from the cigarette lighter or other power source. [Design Ideas by Fons Janssen, Maxim Integrated Products Inc, Bilthoven, the Netherlands Design by Fons Janssen, Maxim Integrated Products Inc, Bilthoven, the Netherlands
Powered AA NiMH
& NiCd Battery Charger
The charger in this project is designed to charge two AA NiMH
or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMH
s. __ Designed by Stefan Vorketter
PowerPC's On Chip Debug Features Alter Embedded Development
11/07/96 EDN-Design Feature Although best known for high performance, the PowerPC family adds a new dimension to embedded-system development. Unlike most processor families for desktop applications, the PowerPC family includes features designed around embedded-system developers' needs. Design by Jim Challenger, Software Development Systems
Power-supply operates from USB port
09/23/10 EDN-Design Ideas Get 1.25V to 3.75V from an adjustable regulator. Design by Stefano Palazzolo, Senago, Italy |