µC Reprograms Audio DAC Via Serial Interface: 01/07/99 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit.
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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:
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24 Line Parallel Interface for the PC : |
4 Channel 8 Bit Analog to Digital Converter for PC:
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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:
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Analog Signal Acquisition for PC Printer Port:
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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:
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Centronics Port DA Converters & Lowpass Filter:
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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
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Connect other Circuits to PC joystick Port:
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Connect Two CD ROM Drives to One Soundcard:
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Connecting Sega 3D Glasses to a PC Serial Port:
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Control 120VAC Relay With TTL: |
Convert Atari Style Joystick to PC Joystick Port:
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Convert Ataristyle joystick to PC joystick Port:
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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:
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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
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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:
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Frame Grabber W / Parallel Port Interface:
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GameBoy Camera
Parallel Port Interface: |
General Purpose 48 Bit ISParallel I / O Card:
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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:
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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 µP: 10/09/97 EDN-Design Ideas
|
Interfacing 16x2 Character: LCD to parallel port
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Interfacing Microphones to Computer Sound Cards:
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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:
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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 Smart |