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Digital /
Logic Circuits Page 1
Digital or Logic
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Last Updated on:
Friday, March 23, 2012 04:30 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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µC Acts as Dedicated Motor-control - 09/11/98 EDN-Design
Ideas.....Motion-control systems often use a PWM signal to control the
duty cycle for a motor driver or amplifier module.….….Please scroll to
find this circuit.… [Design Idea by [Dylan Horvath, Gecko Sysytems Inc,
Austin, TX] |
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µC Based Circuit Performs Frequency Multiplication - 27-May-99
EDN-Design Ideas.....The traditional frequency multiplier requires many
elements a phase comparator to detect the phase error..... [Design
Idea by Yongping Xia, Teldata Inc, Los Angeles, CA] |
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µC controls charge pump as background task - 1-Aug-97 Issue of
EDN Because of power consumption and cost, designers of
battery-powered devices mainly choose components that run at 3V or lower.
..... [Design Idea by Carlos Cossio, Santander, Spain] |
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µC Controls Digital Potentiometer - 10/08/98 EDN-Design
Ideas.....Many digitally controlled potentiometers (for example, the
LM1971/02/3 from National Semiconductor,
www.national.com] incorporate a three-wire serial digital interface,
using data, clock, and enable lines....[Design Idea by Lukasz Sliwczynski,
University Of Mining And Metallurgy, Krakow, Poland] |
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µC detects transmission rate of RS232 interface - 09/30/99 EDN-Design
Ideas.....RS-232 is the most common serial interface in the PC world. Most RS-232
interfaces communicate with the receiver at a fixed transmission rate, such as 9600
baud. But what happens if the transmitter operates with different transmission rates?
Different transmission rates..... [Design Idea by Thomas Schmidt, Microchip
Technology, Chandler, AZ] |
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µC forms FM oscillator - 10/28/99 EDN-Design Ideas.....A project required an
inexpensive oscillator whose frequency increased step by step from 200 to 400 Hz and
then decreased to 200 Hz. The first step was to design a VCO with a staircase driver.
However, this approach entailed at least four ICs and many discrete components.
An..... [Design Idea by Abel Raynus, Armatron International, Melrose, MA] |
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µC generates a frequency burst - 02/03/00 EDN-Design Ideas.....Pulse-sonar
applications require generating bursts of a given frequency, duration, and repetition
rate. Traditionally, burst generator comprises a crystal oscillator with pulse
modulation. But easiest and cheapest way to generate bursts is by using an
inexpensive 8-bit µC, such as 68HC705KJ1 and 68HC7051A (Motorola]..... [Design
Idea by Abel Raynus, Armatron International, Melrose, MA] |
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µC implements Pushbutton Light Dimmers - 06/18/98 EDN-Design Ideas.....A
project required building a synchronous-demodulator circuit to track a line drawn on
paper. beauty of synchronous-modulator/demodulator approach is its
inherent noise rejection. method rejects ….File contains several circuits,
scroll to find this one..... [Design Idea by William Grill, Riverhead Systems,
Littleton, CO] |
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µC makes inexpensive sine-wave generator - 12/17/98 Issue of EDN You
can use A/D converters or external, controllable oscillators to generate sine waves
from low-power, low-cost µCs. However, these methods add cost, reduce reliability,
increase circuit and software complexity, increase power consumption, and increase
overall size. Alternatively.....Page includes several designs. Scroll to find
this one..... [Design Idea by Jorge Luis B Romeu, IdeaWorks LTD, Syracuse, NY] |
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µC measures High-frequency signals - 03/02/98 EDN-Design Ideas.....To
measure a high-frequency signal using an 8-bit µC, the time period of the measured
frequency must be relatively close to the internal clock of the µC. For example, if
the internal clock period is 1 �sec, then.…File contains many circuits, please scroll
to find this one..... [Design Idea by Stan D'Souza, Microchip Technology Inc,
Chandler, AZ] |
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µC provides analog data to PLC chip - 07/03/97 EDN-Design Ideas.....The low
price of programmable-logic controllers (PLCs] makes these small devices a good choice
for many system designs. Most of the controllers, however, accommodate only digital
inputs. One such.… [Design Idea by Luke Barker, Reinke Mfg Co, Deshler, NE] |
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µC Provides Wireless Keypad Control - 10/08/98 EDN-Design Ideas.....Portable
systems, such as telephone handsets, make extensive use of low-dropout
(LDO]regulators. se components provide noise-sensitive parts with a stable
power-supply line.....Scroll to find this specific article..... [Design Idea by Lloyd
Khuc, Motorola Inc, Austin, TX] |
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µC reprograms audio DAC via serial interface - 01/07/99 Issue of EDN
You can use a simple µC to continuously program an audio DAC so that it operates in a
20-bit resolution mode ( Figure 1 ]. After power-on, PCM1710 delta-sigma DAC
(Burr-Brown Corp, www.burr-brown.com]operates in its default 16-bit
resolution.....Page includes several designs. Scroll to find this one.....
[Design Idea by Lukasz Sliwczynski, University of Mining and Metallurgy, Institute of
Electronics, Cracow, Poland] |
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µC routines clear up errors - 11/10/94 EDN-Design Ideas.....The ZIPfile
attached to EDN BBS /DI_SIG #1619 contains executable programs and source code for
programs that allow you to program MC68HC11 microcontrollers via an RS-232C connection
to your PC. The programs replace obsolete, error-laden programs published in an
applications note..... [Design Idea by Mika Maaspuro, Kirstinmaki, Espoo, Finland] |
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µC squares input signal - 12/19/96 EDN-Design Ideas.....Converting a
random-width pulse to a signal with the same frequency but with a 50% duty cycle isn't
easy, especially when the specified frequency range is large…. [Design Idea by
Yongping Xia, Philips Lighting Electronics Co, Torrance, CA] |
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µC tool packages focus on specific applications. - 04/01/99 Issue of EDN
Siemens has extended its microcontroller-development tool support with the “Big Box”
programme—bundled offerings that provide tool chains from a number of third-party
suppliers. The tool set targets a number of “typical” application areas. The company
integrates the tools through a standard interface and includes training and support
from the tools’ manufacturers. Part of Siemens’ “Space” programme, the Big Box covers
8-, 16-, and 32-bit microcontrollers.....Page includes several designs. Scroll
to find this one..... [Design Idea by Graham Prophet] |
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µC uses simple tool for angle measurements - 04/10/97 EDN-Design
Ideas.....The circuit in Figure 1 uses a 2V, 2250-Hz resolver as an angle sensor. The
excitation for the resolver is irregular, using two 90�-phase-shifted, 900-Hz signals.
(The stator is the primary winding.] The output signal’s phase changes from 0 to 360�
with shaft rotation. The signal amplitude..... [Design Idea by Lev Freidin, Patriot
Sensors & Controls Corp, Simi Valley, CA] |
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µC-based one-shot has wide range - 06/19/97 EDN-Design Ideas.....The
µC-based, digitally programmable, monostable multivibrator in Figure 1 has more
accurate timing than a conventional RC-based device because a 20-MHz crystal controls
the µC. The PIC16C54 is a low-cost, high-speed,..... [Design Idea by Yongping Xia,
International Teldata Corp, Los Angeles, CA] |
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