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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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TIMER -- ELECTRONIC sa COMPUTER CLOCKING & TIMING xx TIMER Computer-based laboratory timer. The Heath ET-3400 microcomputer trainer is wired for use as a two-channel, data-logging, millisecond timer. Audible timer circuit can be set for any period of minutes (from 1 to 7) using a rotary switch. An LED also indicates the status of the timer. Suitable for darkroom use and for blind or deaf persons. The 555. A versatile monolithic timer/oscillator integrated circuit. Part 1. Learn to use the 555 and 556 timer IC in practical circuits to obtain accurate time delays and square waves. The 555. A versatile monolithic timer/oscillator integrated circuit. Part 2. Self-triggering oscillator circuits. Build circuits that generate a variety of square or rectangular waveforms, wail like sirens, etc. The 555. A versatile monolithic timer/oscillator integrated circuit. Part 3. Using in a Schmitt trigger, or as the heart of light and temperature alarms and drivers, a metronome, and a continuity tester. The 555. A versatile monolithic timer/oscillator integrated circuit. Part 4. Sawtooth generator, ramp generator, time-base generator, frequency meter, tachometer for a car, etc. Simple, variable, time delay circuit uses a 555 timer IC. How to configure a 555 timer IC circuit to sound a buzzer after a two-minute delay. Delay period can be altered. Printing Stopwatch program for a Radio Shack Model 100 produces a printed time log for jobs which are billed at an hourly rate. Surefire timer programs. These Z-80 and 8080 multiple interval timer programs provide exact delays and eliminate guesswork. How to use "timing flags" in computer programs. A timing flag is a single variable used in place of several separate variables that count cycles and sequences of events. Programmable digital sequencers and controllers. Use them to activate LEDs, motors, solenoids, etc. Part 1. Construction of a 16-step, 4-bit programmable digital sequencer is shown which uses a "punched card" and simple card reader to enter the programs. Programmable digital sequencers and controllers. Part 2. Construction of a 256-step, programmable digital sequencer is shown. Interfacing 555 timers. A hands-on look at real-world use of this ubiquitous and very versatile IC timer chip. Unique "time's up" game timer electronically automates the timing required for many games. Timing cycle can be set in 1-second increments from 1 second to 4 minutes and 15 seconds. Experimenting with surplus goodies. Ideas for elapsed-time indicators, electroluminescent panels, 60-Hz oscillator module, and chart recorder. Simple relay circuit can be activated by a TRS-80 computer and a BASIC program, resulting in a programmable timer to turn electrical devices on after a specified delay. Use your TRS-80 computer as a timer or alarm clock. Program computer to time an event lasting up to 24 hours or to sound an alarm at any desired time. Time-out circuit uses a 555 timer configured in the astable mode as opposed to the monostable, or one-shot mode. Supercharging a 555 timer IC. Exploring the built-in voltage-controlled oscillator function. Test fixture for 555 oscillator timer ICs will quickly show which ones are good, beginning to fail, or have gone bad. Tele-timer circuit. A buzzer sounds after a preset time interval, either 3 seconds or 1-to-10 minutes. The 558 quad monostable timer. An introduction to this improved version of the venerable 555 and 556 oscillator/timer ICs. Part 1. The 558 quad monostable timer. Part 2. The 558 quad monostable timer. Part 3. Motorola MC14538 dual, precision, retriggerable monostable multivibrator applications. (1) Extended on-time timer circuit. (2) No-doze alarm circuit requires pressing reset button every 50 seconds. (3) Self-retriggering timed-on generator circuit. (4) Lamp-switching circuit to provide a delay turn-off function. Unijunction transistor (UJT) circuits. (1) Relaxation oscillators. (2) Constant-current relaxation oscillator. (3) Improved-linearity relaxation oscillator. (4) 1- to 30-second time-delay. (5) RF snooper. How to use the popular 555 timer IC in practical monostable multivibrator circuits. (1) Fixed-period timer. (2) Relay drivers. (3) Pulse generator. (4) 1-kHz linear-scale analog frequency meter. A mixed collection of practical 555-timer IC application circuits. (1) Schmitt-trigger converts sinewaves into squarewaves. (2) Dark-activated relay switch can control lighting. (3) Code-practice oscillator. (4) Electronic door buzzer. (5) LED flasher. (6) Long-period timers. Timing is everything. A collection of timer circuits. (1) Simple 555 timer. (2) Dual timer uses a 556 IC. (3) CMOS cascade timer uses two 4528 ICs. (4) Cheapie timer uses 4050 hex noninverting buffer IC. (5) Expanded timer uses three buffer stages with 4050 ICs. Build the millennium clock. This electronic calendar will keep track of how many days until a certain event happens. The 8253 programmable interface timer IC. Part 1. A demonstration program for the Intel 8253 programmable interval timer. This program is used in connection with an 8080 computer to illustrate the various modes of operation of the timer. The 8253 programmable interface timer IC. Part 2. Characteristics of the timer. How to design microprocessor-based projects. Part 2. The language of the 8073 microinterpreter (National Semiconductor's Tiny BASIC). Includes an application circuit called "burglar outwitter" to control three lights in a sequential fashion to simulate the movement of a person during the evening hours. Panel-mounted timer will turn on a red LED to remind you to change fuel tanks. The circuit shown lets you select a 30-minute or 60-minute interval. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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