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Digital  / Logic Circuits 
Digital or Logic Circuits:  #'s    A     B     C    D     E - F     G - H
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

ÁC acts as dedicated motor control - 09/11/98 EDN Design Idea   (Scroll to find this circuit design)   Motion-control systems often use a PWM signal to control the duty cycle for a motor driver or amplifier module. Typical designs generate the PWM signals using ÁC with dedicated PWM output lines, such as the PIC16C65 (Microchip Technology, www. microchip. com) and the HC11 (Motorola Inc, www. motorola. com). However, these ÁC may have more features than necessary for a motion-control system with multiple degrees of freedom. . . [by Dylan Horvath, Gecko Systems Inc, Austin, TX]

 

ÁC Based Circuit Performs Frequency Multiplication - 05/27/99  EDN Design Idea   The traditional frequency multiplier requires many elements a phase comparator to detect the phase error between the input and the output signals, a lowpass filter to convert the phase error. . . [by Yongping Xia, Teldata Inc, Los Angeles, CA]

ÁC controls charge pump as background task - 08/01/97  EDN Design Idea   Because of power consumption and cost, designers of battery-powered devices mainly choose components that run at 3V or lower. Unfortunately, many devices operate only at 5V, including LCDs with built-in drivers, programming lines of. . . [by Carlos Cossio, Santander, Spain]

ÁC Controls Digital Potentiometer - 10/08/98 EDN Design Idea   (Several Design Ideas, scroll to find this one. )  Many digitally controlled potentiometers (for example, the LM1971/2/3 from National Semiconductor, www. national. com) incorporate a three-wire serial digital interface, using data, clock, and enable lines. In Figure 1, the potentiometer's nomenclature for these lines is Data-In, Clk, and Load/Shift, respectively. The assembler program in Listing 1 provides an interface to an SAB80535 ÁC. The main idea of the method is to use the capture/compare capability of Timer 2 in the ÁC to provide the timing relationship between the Data-In and Clk signals. The principal control of the interface comes from subroutine S16BIT in Listing 1. . . [by Lukasz Sliwczynski, University Of Mining And Metallurgy, Krakow, Poland]

 

ÁC detects transmission rate of RS-232 interface - 09/30/99 EDN Design Idea   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 transmit. . . [by Thomas Schmidt, Microchip Technology, Chandler, AZ]

 

ÁC forms FM oscillator - 10/28/99 EDN Design Idea   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 l. . . [by Abel Raynus, Armatron International, Melrose, MA]

 

ÁC generates a frequency burst - 02/03/00 EDN Design Idea   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 genera. . . [by Abel Raynus, Armatron International, Melrose, MA]

 

ÁC implements pushbutton light dimmer - 06/18/98 EDN Design Idea   (Several design ideas on this page, scroll to find this one)  Four ICs--a multiplier, a sync separator, an op amp, and a dc-restore IC--along with a handful of passive components can implement a complete AGC and dc-restore circuit for video signals (Figure 1). . . [by William Grill, Riverhead Systems, Littleton, CO]

 

ÁC makes inexpensive sine-wave generator - 12/17/98 EDN Design Idea   (File contains many circuits. Scroll to find this one. )  You can use A/D converters or external, controllable oscillators to generate sine waves from low-power, low-cost ÁCs. However, these methods add cost, reduce reliability, increase circuit and software complexity, increase power consumption, and increase overall size. Alternatively, and with just a few lines of code, . . . [by Jorge Luis B Romeu, IdeaWorks LTD, Syracuse, NY]

 

ÁC measures High-frequency signals - 03/02/98 EDN Design Idea   (File contains many circuits, please scroll to find this one)  To measure a high-frequency signal using an 8-bit ÁC, the time period of the measured frequency must be relatively close to the internal clock of the ÁC. For example, . . . [by Stan D'Souza, Microchip Technology Inc, Chandler, AZ]

 

ÁC multiplexes six digital potentiometers - 05/11/00  EDN Design Idea   In Figure 1's circuit, a ÁC lets you adjust as many as six digital potentiometers. Like mechanical potentiometers, digital potentiometers can adjust regulator outputs or speaker volumes and act as rheostats. Available in resistances of 50, 100, and 200 kV. . . [by Ted Salazar, Maxim Integrated Products, Sunnyvale, CA ]

 

ÁC Provides Wireless Keypad Control - 10/08/98 EDN Design Idea   (Several Design Ideas, scroll to find this one. )  The circuit in Figure 1 is a simple, 4X4 keypad remote-control system. A 68HC705J1A ÁC, IC1 (Figure 1a), costs less than $1 and controls the keypad functions. When you depress any key, the ÁC provides a 4-bit hex-data output and then enables a latch signal to latch the data into IC2. Next, the ÁC enables IC2 to transmit the signal to the IC3 encoder to convert the 4-bit hex data to serial data to send to IC4. IC4, the RF data-transmitter module, mixes the serial data with the 315-MHz carrier frequency to transmit. . . [by Lloyd Khuc, Motorola Inc, Austin, TX]

 

ÁC reprograms audio DAC via serial interface - 01/07/99  EDN Design Idea (contains several designs, scroll to find this one)   You can use a simple ÁC to continuously program an audio DAC so that it operates in a 20-bit resolution mode ( Figure 1 ). After power-on, the PCM1710 delta-sigma DAC (Burr-Brown Corp, www. burr-brown. com) operates in its default 16-bit resolution mode. Switching to its 20-bit resolution mode requires supplying the converter with a control word using its three-wire serial digital interface (SDI). . . [by Lukasz Sliwczynski, University of Mining and Metallurgy, Institute of Electronics, Cracow, Poland]

 

ÁC Routines Clear Up Errors - 11/10/94 EDN Design Idea   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, erro. . . [by Mika Maaspuro, Kirstinmaki, Espoo, Finland]

 

ÁC squares input signal - 12/19/96 EDN Design Idea   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. . . [by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA]

 

ÁC tool packages focus on specific applications - 04/01/99 EDN Design Idea   (contains several designs, scroll to find this one)   Siemens has extended its microcontroller-development tool support with the ôBig Boxö programmeŚbundled offerings that provide tool chains from a number of third-party suppliers. The tool set targets a number of ôtypicalö application areas. The company integrates the tools through a standard interface and includes training and support from the toolsĺ manufacturers. Part of Siemensĺ ôSpaceö programme, the Big Box covers 8-, 16-, and 32-bit microcontrollers. . . [by Graham Prophet, Hewlett-Packard, Bracknell, UK]

 

ÁC uses simple tool for angle measurement - 04/10/97 EDN Design Idea   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 signalĺs phase chan. . . [by Lev Freidin, Patriot Sensors & Controls Corp, Simi Valley, CA]

 

ÁC-based one-shot has wide range - 06/19/97 EDN Design Idea   The ÁC-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 ÁC. The PIC16C54 is a low-cost, high-speed, . . . [by Yongping Xia, International Teldata Corp, Los Angeles, CA]

 

0-5V PIC Voltmeter - Higher voltage can be measured with resistor voltage divider . . . [design's name not included]

 

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Digital or Logic Circuits:  #'s    A     B     C    D     E - F     G - H
I - K     L     M - O     P     Q - R     S     T     U     V - Z


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