�C Reprograms Audio DAC Via Serial Interface: 01/07/99 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit.
|
10 Base T Solutions Network Interface Adapter: National
Semiconductor Application Notes,28 Jun1996 |
12Bit ADC Interface: |
18 bit ADC uses PC's serial port: 09/27/2001 EDN - Design
Ideas / A PC usually requires a plug-in ADC card to process
analog signals. However, with the circuitry in Figure 1, a PC
can communicate with an 18-bit ADC through its serial port. The
port provides both positive and negative power supplies as well
as control signals. IC1 is an 18-bit MAX132 ADC with a serial
interface. |
2 Channel, Port Powered RS232 to RS 422 Converter:
information on commercial product, datasheet includes full
circuit diagram |
2 Transistor Circuit Replaces IC #1: 02/07/02 EDN-Design
Ideas / Jim Hagermans article Linear Technologys recently
introduced LTC4300 chip buffers I2C clock and data lines to and
from a hot-swappable card. This task is difficult because the IC
must work bidirectionally. |
2
Transistor Circuit Replaces IC #2: 02/07/02 EDN-Design
Ideas / Linear Technologys recently introduced LTC4300 chip
buffers I2C clock and data lines to and from a hot-swappable
card. This task is difficult because the IC must work
bidirectionally. |
24 Bit Parallel Port Interface With 8255 for Commodore Computer: |
24 Line Parallel Interface for the PC : |
4 Channel 8 Bit Analog to Digital Converter for PC:
|
8254 Timer & Counter Board: |
9 to 9 Pin (Female) Null Modem Cable: |
AC Switching With TrIAC From TTL: |
ADCx RS232 Interface Schematic: |
Add CAD functions to Microsoft Office: 03/21/2002 EDN -
Design Ideas / Microsoft Word has excellent drawing
capabilities. You could use it effectively to perform some CAD
tasks, such as schematic entry. Word is by far the most popular
text processor on the market, and it would seem desirable for
technical writers to be able to create a single integrated
document file combining both text and graphics in an editable
format. . |
Add current boost to a USB charger: 09/19/2002 EDN - Design
Ideas / The popular USB interface can charge a portable
device while transferring data. But for high-capacity batteries,
the 500-mA output current of USB hosts and powered hubs greatly
extends the charging time. (Unpowered USB hubs supply no more
than 100 mA.) Thus, a system that accepts charging power from an
ac adapter as well as the USB port is more convenient.. |
Add Speech Encoding/Decoding to your Design: 02/04/99 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find
circuit. |
Add voice command to virtual instrumentation: 05/30/2002
EDN - Design Ideas / Debates still persist in the engineering
community about the relative merits of analog and digital
controls of instrumentation. Meanwhile, a revolutionary new type
of control—voice-command control—is gaining acceptance in many
application areas (Reference 1). This Design Idea focuses on the
practical implementation of the Voice Commander voice-command
interface in a virtual-instrume.... |
Add voice commands to your CAD system: 05/02/2002 EDN -
Design Ideas / The first time I activated the Language Bar
(Speech Tools) in my Microsoft Word 2002 and started dictating
this Design Idea, the on-screen title displayed "cat" instead of
"CAD." By using the "Add/Delete Words" feature, I've trained the
system to recognize the "CAD" acronym. This was my first
experience with the MOSR (Microsoft Office Speech Recognition)
tool, which is part of the latest Micros.... |
Adding Second joystick to PC joystick Interface:
|
Analog Signal Acquisition for PC Printer Port:
|
AVR
DMX 512 Dongle for PC's: simple interface between DMX-512
equipments and personal computer that is connected to computer
parallel port, can transmit256 channels and receive128 channels
DMX data simultaneously |
AVR microcontroller makes improved motor controller:
10/17/2002 EDN - Design Ideas / The circuit in Figure 1
provides a novel method of reading the pulse train using an
Atmel (www.atmel.com) AVR processor, from a typical
radio-controlled receiver, and to determine the velocity of a
motor. To capture the pulse train from a typical receiver, you
need an external interrupt that triggers based on a rising and a
falling edge.. |
Build Logic Gates using Discrete Parts: |
Build your own joysticks: |
Casio Organizer Interface: |
CCD Video Capture Camera Circuit on Request:
|
Centronics Port DA Converters & Lowpass Filter:
|
Circuit Adapts Differential Input to Drive Coax: 05/08/97
EDN-Design Ideas / Uses an HFA1100 or HFA1105 to convert a
balanced input signal to a single-ended output signal, uses
positive feedback to characteristic-impedance matching while
increasing the available output swing, as compared with using a
simple series termination resistor |
Circuit Eavesdrops on RS232C Lines: 12/05/96 EDN-Design
Ideas |
Circuit Protects Computer's Input: 05/26/94 EDN-Design
Ideas |
Circuit Translates TTY Current Loop to RS232C: 08/03/98 EDN
Design Ideas / Provides signal translation between a passive
current-loop (TTY) interface and a duplex RS-232C ports |
Commonly used RS232 Serial Port Cables: |
Computer Controlled Model Train Set: |
Computer Microphone: adapting electret microphone to
soundcards with dynamic microphone inputs |
Computerize your Room / Home: |
Computerized Infrared Remote: control your stereo, TV and
VCR from Windows, includes schematic and software |
Connect other Circuits to PC joystick Port: |
Connect Two CD ROM Drives to One Soundcard:
|
Connecting Sega 3D Glasses to a PC Serial Port: |
Control 120VAC Relay With TTL: |
Convert Atari Style Joystick to PC Joystick Port:
|
Convert Ataristyle joystick to PC joystick Port:
|
Convert Hauppauge Infrared Remote Control to IRMAN: How to
modify Hauppauge Infrared remote control receiver to work as
IRMAN compatible remote control receiver. The text is in
Finnish. |
Data Bus Monitor: |
Data Transmission Lines & Their Characteristics: National
Semiconductor Application Notes,05 Oct1998 |
Decoder Safely Drives Data Bus Buffer: 07/18/96 EDN-Design
Ideas |
Design a visible optical link for RS 232C communications:
01/09/03 EDN-Design Ideas / The design in Figure 1 is a visible
optical link for those who need to see the transmitted data. An
isolation figure of more than 5000V is a bonus. Tests of the
system used the COM input of a data-acquisition system, as well
as a standard PC's COM port. The MC1489 converts the RS-232C
data to TTL signals... |
Differential to Single Ended Converter: 03/14/96 EDN-Design
Ideas |
Digital to Analog Centronics D / a & Filter: |
Disco Lights:
software and hardware for controlling disco lights from your PC |
Drawing Power From a PC Serial Port: This circuits derives
fairly low power, (mA at5V) from a RS-232 serial connection.
(NOTE: ASCII drawing) |
Drive Local Interconnect Network With PCType UART Device :
04/15/02 Electronic Design - Ideas for Design / A new
single-wire serial communication system, called the Local
Interconnect Network (LIN), is intended for electronic control
units in vehicles (www.lin-subbus.org). Using a PC UART for LIN
provides a convenient and low-cost solution for... |
Driving a N Channel FET From TTL: Meant as a quick n easy
example of how to switch high current12V dc from TTL. |
Driving a Relay With a CPU: |
Electrical Equipment Control using PC: |
Embedded processor directly drives LCD: 01/09/03 EDN-Design
Ideas / Driving a bare LCD does not necessarily require
specialized interface circuitry or peripherals. This Design Idea
describes an alternative drive scheme, which you can easily
implement using the general-purpose outputs of a
microcontroller. Many embedded-system applications need to
interact with a user by displaying simple numeric or
alphanumeric character… |
Emissions killers Trap Common Mode Currents: 03/03/98 EDN-Design
Ideas / Unshielded twisted-pair cable that is
transformer-coupled to a digital system can easily act as a
radiating antenna because of common-mode currents induced by
unwanted stray coupling from the digital portions of the system |
Encoder and PC make complete motor control system:
12/12/2002 EDN - Design Ideas / This Design Idea combines a
simple ISA-bus-resident interface circuit; a garden-variety PC;
a high-resolution optical shaft encoder; and a PWM-controlled,
0.05-hp, brushed, permanent-magnet dc motor to make a
high-precision and high-power motion-control system. The system
sequences the precise rotation of an evacuated steel bell jar
several feet in diameter, such as those used in
molecular-beam.... |
Encrypted routines impede hackers, protect licenses:
04/04/2002 EDN - Design Ideas / The use of
public-key-encrypted algorithms within licensed applications can
prevent hackers from cracking the licensed algorithms. Moreover,
you can use them to disable licensed features that a user
doesn't purchase. Licensing schemes eventually arrive at some
critical decision point at which an algorithm decides whether
the user is entitled to run that application. |
Envelope follower combines fast response, low ripple:
12/26/2002 EDN - Design Ideas / Envelope followers extract
amplitude information from complex audio waveforms. The
resulting dc voltage often drives nonlinear stages, such as
voltage-controlled amplifiers or filters. You must make a
careful trade-off between the speed of response to a rapidly
changing input signal and the amount of ripple in the dc output
that you can tolerate.. |
Envelope Tracker quells jitter: 07/07/94 EDN-Design Ideas
|
EPROM Emulator: |
EPROM Prog / Emul PSU: |
EPROM Programmer Mk1: |
EPROM Programmer Mk2: |
Ethernet / Cheapernet Physical Layer Made Easy With DP8391 / 92:
National Semiconductor Application Notes,04 Nov1995
|
Excel Formula Calculates Standard 1%Resistor Values :
01/21/02 Electronic Design - Ideas for Design / The Excel cell
formula below calculates the nearest standard 1%-resistor value
without using a lookup table or macro. Type or electronically
paste the text below into any cell (other than A1). The formula
will calculate the nearest 1%-resistor for the... |
Fake Joystick Circuit: This simple circuit can be used to
make the computer to think that there is a real joystick
connected to joystick port. This adapter might be useful in some
special computer testing applications when you dont have real
joystick available. ASCII drawing. |
Fax to Modem Interface: |
Filtering PC Bus Power: |
Four Channel 8 Bit Analog to Digital Converter for PC: |
Frame Grabber W / Parallel Port Interface: |
GameBoy Camera
Parallel Port Interface: |
General Purpose 48 Bit ISParallel I / O Card: |
Get Power Out of PC Parallel Port: An article which includes
circuits, shares how to us a parallel port to connect to a very
wide selection of devices like software protection dongles,
removable disks, modems, network adapters, printer sharing
units, parallel port extenders, soundcards, electronic telecard
readers and many circuits. |
Getting Power From Serial Port: |
Group Delay Equalizer has Gain More than One: 10/12/95 EDN-Design
Ideas |
Hints and kinks for USB decoding: 02/07/2002 EDN - Design
Ideas / The USB is a serial data-transmission system that
uses cables to connect peripheral equipment to PCs. All new
computers have two or more USB receptacles, and the predictions
are that they will replace most of the legacy receptacles on
older PCs. The 1.0 and 1.1 standards for USB were for 1.5 and 12
Mbps at low- and full-speed rates, respectively. |
How to get Power From PC to your Circuits:
|
Hyperbaric FallTime Viscometer Is PCBased : 10/28/02
Electronic Design - Ideas for Design / The measurement of the
viscosity of solutions is an integral element in analytical
chemistry and chemical manufacturing. It has particular value in
designing and controlling the processes of polymerization, an
essential step in the production of... |
IC Adds Full Duplex RS485 Operation: 11/23/94 EDN-Design
Ideas / Simple RS-485 repeater provides full-duplex
communications with only tow ICs |
IDE hard Disk Interface for Amiga 500: |
Infrared Computer Controlled Infrared Device:
|
Infrared Interface With Windows CD Software: use infrared
technology to remotely control a CD-ROM drive with an audio CD |
Infrared Remote Control Of your PC Is Easy!: simple device
that connected to the computer serial-port enables the reception
of infrared codes emitted from any commercial remote control
unit and with a little Windows program the computer learns to
recognize sequences and simulates key pressing or executes a
program |
Infrared Remote Control Repeater: |
Infrared Remote Home Control: software Remocon Con for
Windows98 able to fire remote control signal through built in
infrared port (IrDA) that is of notebook personal computer
standard equipment |
Interface 20Bit SigmaDelta ADCs Through a PC's Parallel Port
: 03/04/02 Electronic Design - Ideas for Design / In most
sigma-delta analog-to-digital converter (ADC) applications, the
serial data transfer occurs through a serial port. A
microcontroller configures the serial port as required |
Interface a serial 12 bit ADC to a PC: 07/10/03 EDN-Design
Ideas / Over the years, IC manufacturers have devised
various ways of effecting interfaces and paying special
attention to reducing the number of ICs' interface-I/O pins. The
MAX187 is one such device, a 12-bit A/D converter. You can
create an interface to this ADC using serial data communications
techniques.... |
Interface Connects ISBus to �P: 10/09/97 EDN-Design Ideas
|
Interfacing 16x2 Character: LCD to parallel port |
Interfacing Microphones to Computer Sound Cards:
|
IS48 I / O Digital Card: ComInt was designed and built for a
colleague at work. He needed a device with a large number of
I/Os to control his Gameboy device from the PC. A simple circuit
using only4 ICs proved to be a good solution. It uses two 8255
Programmable Peripheral Interface chips and provides48 I/O
signals, each being software programmable. |
ISBus Provides Access to Serial Peripherals: 02/17/97 EDN-Design
Ideas |
Isolated Full Duplex RS232C Interface: |
Isolated RS232 for PIC16F84: |
Joystick Interface Projects: |
Joystick Interfaces: analogue interfaces for joysticks for
motor controllers |
Joystick Port As General Purpose Input: |
Key Reading Circuit Saves I/O Pins: 03/06/03 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit |
LAN Switch Eliminates Redundant PHY Chip: 03/31/03
Electronic Design - Ideas for Design / Advances in notebook
technology create a thirst for new features and increased
functionality, culminating in greater cost and shrinking space.
One solution to the cost/space issues is to use a wide-bandwidth
analog local-area network (LAN) switch that...
|
Laptop Computer Serial Port Power Booster:
|
Line Driver Economically Synthesizes Impedance: 01/06/94 EDN-Design
Ideas / Line-driver circuit uses a second op amp to synthesize
the output impedance rather than inserting a power-hungry
resistor in series with the op amps output |
Linux Infrared
Remote Control (LIRC): |
Lookup Table Facilitates Bit Flipping: 11/23/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit.
|
Low Power Ethernet With the CMOS DP83910 Serial Network
Interface: National Semiconductor Application Notes,05
Aug1995 |
Low Power RS232C Driver & Receiver in CMOS: National
Semiconductor Application Notes,05 Oct1998 |
Low Voltage Powers ParallelPort Interface : 06/24/02
Electronic Design - Ideas for Design / For portable-sensing and
data- acquisition applications, a laptop computer and its
parallel port (LPT) make good bedfellows. Yet in the effort to
extend battery life, many microprocessors and entire systems
operate with logic levels down to 1.8 V. The... |
Mains Manager: |
Maintain precise timing with PC's speaker logic: 07/11/2002
EDN - Design Ideas / Precise timing control is paramount in data
acquisition and analysis and especially in digital-signal
processing. The easiest way of maintaining timing control in a
PC is to use delay loops. The disadvantage of this
implementation is that the delay loop's elapsed time depends on
the system's operating frequency |
Make Eight Channel Measurements through An LPT Port:
06/13/02 EDN-Design Ideas / The circuit represents a
simple and cost-effective way to obtain eight-channel
analog-signal acquisition through a PCs LPT port. IC1, a12-bit,
serial-output MAX187 ADC, operates from a single5V supply and
accepts analog inputs of0 to5V. |
Make eight channel measurements through an LPT port:
06/13/2002 EDN - Design Ideas / The circuit in Figure 1
represents a simple and cost-effective way to obtain
eight-channel analog-signal acquisition through a PC's LPT port.
IC1, a 12-bit, serial-output MAX187 ADC, operates from a single
5V supply and accepts analog inputs of 0 to 5V. IC2, an
eight-channel MAX338 analog multiplexer, also operates from a
single 5V supply.. |
Microcontroller Interface for 5KW Microwave oven: |
Microprocessor RS232 Reset: |
MIDI Controlled Switches: can drive up to128 individual
relays, solenoids, motors, etc. with a MIDI note-on and note-off
messages |
More Accurate PC / AT Clock: Nixie Tube Clock |
NES to Atari 2600 Controller Interface: |
Novel idea implements low cost keyboard: 04/03/03 EDN-Design
Ideas / Many applications that use a microcontroller also use a
keyboard. If your application uses a relatively powerful
microcontroller, you can use several free I/O pins or an unused
input with an ADC to effect an easy keyboard connection. But, if
the microcontroller in your system has too few free I/O pins and
no on-chip ADC, you can be in trouble... |
Null Printer Adapters: |
Parallel Port Central: information on using PC parallel port
for I/O and Windows drivers for that, useful for your own
circuit interfacing |
Parallel port controls arbitrary waveform generator:
06/13/2002 EDN - Design Ideas / You can use the parallel port
of your PC and a few additional components to generate a
powerful, easy-to-use arbitrary-waveform generator. By using a
Visual Basic program with the circuit in Figure 1, you can
generate any waveform (for example, sinusoid, triangle,
amplitude- or frequency-modulated, or exponential decay) by
simply entering its characteristic equation.. |
Parallel port provides high resolution temperature sensing:
10/03/2002 EDN - Design Ideas / High-resolution temperature
sensing at low cost is possible using only one chip attached to
the PC's parallel port (Figure 1). The Dallas Semiconductor (www.dalsemi.com)
DS1722 digital thermometer allows measurement resolution as fine
as 0.0625�C in digital form and with linear response. The
accuracy specification is only 2�C, but you can improve this
figure by careful calibration.. |
PBUS, Multi Drop RS422 / 485 type Ne2 Rk for Interconnecting PIC
Nodes: |
PC / XS Transfer: (PDF) A circuit and C code for
bidirectional transfer of data between an XS40 Board and a PC.
|
PC and LongBaseline Chronography Measure Ballistic Parameters
Acoustically : 07/22/02 Electronic Design - Ideas for
Design / Ballistics is an ancient art |
PC Based 7 Segment Rolling Display: |
PC Based Biofeedback Monitor: |
PC based configurable filter uses no digital potentiometers:
01/23/03 EDN-Design Ideas / Modern instrumentation requires
digital control signals. These signals come from a central
microprocessor or, in modern context, the popular parallel or
serial PC ports. In recent times, digital potentiometers have
eliminated the hassles from this interface for the analog
section. Designers can replace the resistors of the analog
design with digital potentiometers, thus providing the necessary
..... |
PC Based Configurable Filter uses No Digital Potentiometers:
01/23/03 EDN-Design Ideas / PDF contains multiple circuits -
scroll to find this circuit -- Modern instrumentation requires
digital control signals. These signals come from a central
microprocessor or, in modern context, the popular parallel or
serial PC ports. In recent Times, digital potentiometers have
eliminated the hassles from this interface for the analog
section. |
PC Based Digital Storage Oscilloscope (DSOA):
|
PC Based Digital Storage Oscilloscope Mk3: |
PC Based EFI Programmer: |
PC Based Lighting Control: short pointer to each of the
available commercial PC based lighting console systems
|
PC Based Lighting Control: short pointer to each of the
available commercial PC based lighting console systems |
PC Based Oscilloscope: |
PC board layout eases high speed transmission: 11/08/2001
EDN - Design Ideas / As digital techniques move to higher
speeds, designers become aware of the need to treat pc-board
traces as RF transmission lines. In these lines, you strive to
hold the line impedance, Z0, to a constant value-typically,
50U-and to terminate the line with the same impedance. Data
families such as ECL, PECL, and LVDS send data over a pair of
traces known as a balanced tra... . |
PC configurable RLC resonator yields single output filter :
08/07/03 EDN-Design Ideas / This Design Idea presents a
versatile filter circuit for low-power-consumption
instrumentation that you can program from your PC using the
parallel port. The circuit uses analog switches and latches
instead of digital potentiometers for the digital control
(figures 1 and 2). By running simple software code on the PC,
you can configure a single robust design to work as a lowpass,
highpass, or b...... |
PC Controlled Current Source Supplies 100V, 1A, 16Bit Pulses
: 04/29/02 Electronic Design - Ideas for Design / The current
source shown in the figure is designed to support toroidal-cavity
nuclear-magnetic-resonance electrophoresis (TCNMRE) measurements
of molecular electrical mobility in chemical samples. To do
so,... |
PC Controls inexpensive Waveform Generator: 06/05/96 EDN-Design
Ideas |
PC Controls Light Dimmer: 08/19/99 EDN-Design Ideas /
Circuit design idea from EDN Magazine to control one light
dimming from PC |
PC hardware Monitor Reports the Weather: 01/18/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find the one
of interest -
|
PC Infrared Remote Control #1: |
PC Infrared Remote Control #1: |
PC IR Remote Control: |
PC Monitors twoway RS232 Transmission: 02/01/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit. |
PC Mouse Implementation using CoP800: National Semiconductor
Application Notes first published05-Aug-1995
|
PC Mouse Implementation using CoP800: National Semiconductor
Application Notes first published05-Aug-1995
|
PC Parallel Port Output Capabilities: includes instructions
how to connect a relay to PC parallel port |
PC SmartCard Reader: |
PC Speaker Volume Control Circuit: |
PC Thermometer: |
PC to SRAM Interface: for the XSV Board (Univ. of
Queensland) |
PC's IRQ7 and INT1Ch measure currents, charges: 10/12/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit |
PIC Based Keyboard Emulator: |
PIC
Project #1 RS232 to I2C Interface: |
PIC16F84 Debugging Terminal: |
PIC16F84 Serial I / O Expander With PicBasic:
|
Playing a Mac through a Standard Telephone Line: how to get
sound from computer to Telephone line |
PLD code reveals pc board revisions: 10/17/2002 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.... |
Port Interface: |
Post Tray Email Service: PoTrES is a small stand-alone 8-bit
embedded system capable of sending emails to several recipients
on an Ethernet network (corporate intranet, world-wide
internet). It uses a minimal TCP/IP implementation consisting of
several network protocols. |
Practical Limits of RS485: National Semiconductor
Application Notes,05 Oct1998 |
Preprocessor for rotary encoder uses PAL: 08/02/2001 EDN -
Design Ideas / Rotary encoders usually provide quadrature pulses
that indicate both the amount of rotation and the direction
(Figure 1). A microcontroller can calculate the rotation
direction and keep track of angular movement. Many
microcontrollers' interrupt inputs, such as those on the Zilog
Z86C90, can detect only a falling edge.. |
Printer port activates CMOS switches: 05/02/2002 EDN -
Design Ideas / The cost-effective design in Figure 1 provides
control for CMOS switches without the need for an external power
supply. Analog switches such as those in the MAX4663 are ideal
for use in low-distortion applications. They are preferable to
electromechanical relays in automatic test equipment or other
applications in which you need current switching.. |
Printer Sharer: |
Program Predicts VSWRmismatch RF uncertainties: 02/01/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit. |
PSX Controller to PC MIDI Converter: |
Rounding Off' a Square Wave: |
RS232 / 485 Converter has Automatic Flow Control: 04/12/01
EDN-Design Ideas / PDF contains multiple circuits - scroll to
find the one of interest / RS-485 communications can provide
longer range and better noise immunity than RS-232, as well as
multidrop capability. Because it does not have separate transmit
and receive lines, RS-485 requires flow control. RS-232/485
converters often use one of the RS-232 handshaking lines to
control direction, but several communications-software packages
do not support flow control. This circuit an RS-232/485
converter that uses the transmitted signal itself to control the
flow. |
RS232 Port Monitor: |
RS232 Serial Port Buffer Circuit: |
RS232 to RS232 Port Powered Optical Isolator: Brochure with
schematic in PDF format |
RS232C Circuit has Galvanic Isolation: 02/04/99 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find circuit
-- You can obtain longer transmission distances with the RS-232C
interface if you use galvanic isolation between the two linked
terminals |
RS232C Handshake Lines Transfer Data Frames: 10/23/97 EDN-Design
Ideas |
RS232C Interface Meets Telecommunications Safety Specs:
09/28/95 EDN-Design Ideas / RS-232 isolation circuit |
RS232C Level Converter using Transistors:
|
RS232C Level Converter: |
RS232C Powers & Reads 8 Bit Switch Matrix: 04/11/96 EDN-Design
Ideas |
RS232C Serial Port Scans Remote Keypad: 12/04/97 EDN-Design
Ideas |
RS485 Repeater Extends Standard's Reach: 05/26/94 EDN-Design
Ideas |
S Video to Composite Video Adapter: |
Schematic of a Standard PC Joystick: |
Screen Blanker: |
Sega 3D Glass Interfacing Circuits: |
Serial Data Multiplexer: |
Serial Infrared Remote Controller: a simple, cheap device
that can be connected to any serial port to control most
components that have infrared remote controls, includes
schematics for receiver and transmitter |
Serial Isolated I / O Module: 8-Relay Module (mains rated -
to250VAC), kit K108 from kitsrus.com |
Serial Port a / D Converter: |
Serial Port A/D : 12bits, no power, cheap!
|
Serial Port Break Reset Circuit: |
Serial Port Controller infrared Transmitter (PIC16F628):
|
Serial to ECP Interface: |
SerialPortPowered ADC Streams Data To PC : 01/07/02
Electronic Design - Ideas for Design / The circuit shown
in Figure 1 provides a simple, low-power means of digitizing
analog signals and sending the data directly to a PC's serial
port where it can easily be read, analyzed, and stored. The
low... |
Simple FSK Modulator: |
Single �C Pin Makes halfduplex RS232C: 08/05/99 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit.
|
Software makes full use of 8051's interrupt system:
12/06/2001 EDN - Design Ideas / The program in Listing 1 uses a
pseudo-RETI instruction to provide a five-priority-level
interrupt system for the 8051P microcontroller. The
interrupt-priority order, from high to low, is INT0 IT0 INT1 IT1
INTP. Before the pseudo-RETI instruction arrives in the IT0 or
IT1 interrupt-service routine, the address of the first
instruction, which is after the pseudo-RETI instruction, goes ba...
. |
Software Provides Interrupt System for 8051: 11/23/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit.
|
Software reset uses I�C I/O port: 05/16/2002 EDN - Design
Ideas / You can use the circuit in Figure 1 to allow the I2C or
SMBus to control device resets in a system by using the PCA9554
I2 C I/O-port IC. Normally, a reset function takes an active-low
signal. On power-up of the PCA9554, the IC sets all the I/O pins
as inputs. The 4.7-kO pull-down resistor on each I/O ensures
that all the active-low reset pins are initially in a low state
during power-up.. |
Software snippet provides improved subset sum algorithm :
09/25/03 EDN-Design Ideas / The subset-sum problem is one of
the most frequently occurring NP (nondeterministic,
polynomial-time)-complete) problems. It asks whether a subset of
numbers in a set of positive integers adds up exactly to a given
value. A relaxed version of the problem tries to identify a
subset of numbers that adds up to a maximum value no greater
than a given value.... |
SONIC EISBus Master Ethernet Adapter: National Semiconductor
Application Notes,05 Aug1995 |
Soundcard joystick Port Problem Solver: |
Switched Fabric Eliminates CPUbus Bottlenecks: 02/20/03 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit |
Synchronizing Controller Detects Baud Rate: 03/03/98 EDN-Design
Ideas / A simple and inexpensive implementation using an
eight-pin12C508 controller (Microchip Technology, Chandler, AZ)
provides both bit-rate detection and a synchronous,
appended-clock output from an asynchronous input-data stream |
T Volt RGB Signal Output From a SVGgraphics Card: To achieve
a CCInfrared conform TV signal with50 Hz vertical interlaced
refresh and15.625 kHz horizontal frequency on most SVGA cards
its possible to re-program CRT Timing and generate output
signals outside the normal specification range. Then some pretty
simple hardware is needed for rest of the signal conversion. |
Take Power Out of PC RS232 Port: |
The Wire Between MultiIO Card and joystick Connector: |
Thermocouple Interfaces to Serial Port: 11/09/95 EDN-Design
Ideas |
Tricks improve on Excel LCD initialization: 04/11/2002 EDN
- Design Ideas / A previous Design Idea on using Excel for
LCD initialization relies on the user for cutting and pasting
from Excel into an editor (Reference 1). It appears that it
would take a minimum of six keystrokes or mouse strokes from one
character to a. |
Tricks increase utility of parallel port: 09/27/2001 EDN -
Design Ideas / In this simple application of the 68HC68
microcontroller's serial-I/O utility, the goal is to configure a
simple circuit, driven by any LPT parallel-printer port, which
you can use as a remote I/O for a PC. You can independently
program each I/O line as either an input or an output. The
protocol in this application is an SPI (MISO/MOSI/SCK) type,
using synchronous serial communications. . |
TTL to RS232 Interfacing: |
Two Channel, Port Powered RS232 to RS 242 Converter:
information on commercial product, datasheet includes full
circuit diagram |
Two transistor circuit replaces IC #1: 02/07/2002 EDN -
Design Ideas / Linear Technology's recently introduced LTC4300
chip buffers I2C clock and data lines to and from a
hot-swappable card. This task is difficult because the IC must
work bidirectionally, meaning that you can simultaneously and
actively drive both sides. However, as is sometimes the case,
you can replace a complicated circuit by a simple one without
much loss of performance. . |
Two
Transistor Circuit Replaces IC #2: Linear Technologys
recently introduced LTC4300 chip buffers I2C clock and data
lines to and from a hot-swappable card. This task is difficult
because the IC must work bidirectionally |
Understanding Power Requirements in RS232 Applications:
National Semiconductor Application Notes,05 Oct1998
|
Universal Infrared Controller for a PC: This simple circuit
allows you to record any Infrared remote control signal on your
PC, and then play it back. This is particularly useful if you
want to control appliances such as TVs, VCRs, CDs etc. from your
computer. The device simply connects to the parallel port of
your PC. You can also use this circuit to analyze the waveform
from any Infrared remote control. This circuit was originally
published in Electronics Australia, September1998 |
Use a PIC for automatic baud rate detection: 08/22/2002 EDN
- Design Ideas / Automatic baud-rate detection is desirable in
many applications. Microchip's (www.microchip.com) standard
USART module that the company embeds in most of its PIC
microcontrollers lends itself to a simple and easily implemented
automatic baud-detection scheme. The PIC18FXX2 data sheet
defines the following baud rate in bits per second: where X is
the value for the baud-rate generator and FOSC .... |
Use power line for baud rate generation: 08/16/2001 EDN -
Design Ideas / One cost-saving measure associated with 8-bit
embedded microcontrollers is to use a resistor-capacitor
oscillator. These RC oscillators are inexpensive, but the
trade-off is low stability with temperature and voltage. In many
applications, the low cost of an RC oscillator is alluring, but
the application requires a stable clock source for baud-rate
generation or event timing.. |
Use Power Line for Baudrate Generation: 08/16/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this one |
Use printer port as programmable frequency generator:
10/11/2001 EDN - Design Ideas / A simple and inexpensive circuit
( Figure 1 ) and a simple C program ( Listing 1 ) are all you
need to turn your PC's printer port into a programmable
frequency generator. Using a few low-cost and readily available
components, the circuit occupies little space and is easily
attachable to the printer port. . |
Use The PC's Parallel Port for Fast Data Acquisition and Control
: 12/09/02 Electronic Design - Ideas for Design / Many
designers require that their PCs act as complete control systems
without any internal hardware. For this function, users need at
least one channel of analog data acquisition to monitor the
controlled signal. They also require one digital output... |
Use time domain analysis of Zobel network: 06/27/2002 EDN -
Design Ideas / A Zobel network is useful in making a reactive
load appear as a pure resistance to a driving source prone to
stability problems (Reference 1). A typical situation is an
audio power amplifier driving a loudspeaker, modeled at first
approximation as an inductance and a series resistor (Figure
1a). The addition of a series R2C network in parallel with the
series R1L network forms a Zobel network .... |
Using the joystick Port As General Purpose input: |
VC++ Program Converts Hex Strings To Integers : 12/09/02
Electronic Design - Ideas for Design / Binary numbers are seldom
implemented in Visual C++ applications because C++ is considered
a "high-level" language. Yet in communications systems, where
information is transferred between two different devices through
a network, using binary or... |
Velleman Universal Relay Card With 16 Relays: This page has
information on Vellan kit which take computer input and controls
up to16 relays. This page has full kit documentation including
the circuit diagram. |
VGController for the ALTERUP1 Board: This page contains
basic information describing the use of the VGA output port
provided on the Altera UP1 Educational board. VHDL source code
for a simple VGA controller ( VgaCon ) is provided. The purpose
of VgaCon is to isolate the details of VGA signal generation
from all the other modules in a design. VgaCon allows the pixel
information to be written into its video memory using a very
simple interface, while it is al1-responsible for generating the
required signals for displaying the pixel information on a VGA
monitor. |
VGConverter for Video Projectors & Fixed Frequency Monitors:
|
VGGenerator: (PDF) that displays an image in the XS Board
RAM on a VGA monitor. |
VGto T Volt Converter: |
Visual Basic MDAC Offset: 02/18/99 EDN-Design Ideas / PDF
contains multiple circuits - scroll to find this circuit |
VTG 01 PAL / NTSC Video Title Generator: Overlays text over
Video screen, takes input from PC keyboard |
Where is the wiper?: 08/08/2002 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, provides no information about wiper
position, and this information is important in some
applications.. |
X Y Keypad uses �C's Serial Port: 10/10/96 EDN-Design Ideas |
XSBoard Parallel Port Interface: (PDF) that is programmed
into the CPLD. |