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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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COUNTER sa FREQUENCY COUNTER sa TIMER x DIGITAL COUNTER xx READOUT DEVICE xx TIMER Circuit for a 000-to-999 event counter. Use it to count rotations of a wheel or shaft, lightning flashes, etc. Pulse duration counter. Measures the duration of positive- or negative-going pulses independent of repetition rate. Profile of LSI Computer Systems, Inc. CMOS divider ICs. These are counting circuits for 50 or 60 Hertz applications. Technique for counting negative-going pulses (produced by a sensor) using a 4518 binary counter. Several practical digital counter circuits which use integrated circuits. Predetermining decimal counter. A unique inexpensive decade counter that can be cascaded to divide by any number from 1-99, 1-999, etc. Est cost: $8.50 per decade. A 0-9999 Add-Subtract MOS IC decimal counter. Counts, stores, decodes and drives the vacuum tube fluorscent readouts. Digital instruments you can build. Part 2. Counting and decoding circuits. Digital instruments you can build. Part 5. Introduction to electronic counters. Includes construction details for a simple three-mode 6-digit readout counter that uses 60-Hz power line as timing reference. Digital instruments you can build. Part 6. More about electronic counters. Frequency counter. Build a 120-MHz (and better) hand-held, battery-powered, frequency only or universal digital counter. Est. cost: $50 to $75. Counter development center. Learn how counters function and take the hassle out of building and testing binary and BCD (binary-coded-decimal) circuits. The ups and downs of a 3-digit counter. Description of the theory and construction of the Dick Smith 3-Digit Counter Module Kit K-3451. Est. cost: $15. Proximity alarm circuit is used as part of a counter to monitor the number of people using a door. Decoder/driver demonstrator. Breadboarded digital counter project features up/down, BCD/hex, and stop/reset options. Utilizes the Motorola MC14495 IC. Used to understand counter and driver theory. Raindrop counter. Each time a drop of rain closes a touchswitch gap, an LED counter is incremented. An audible "click" accompanies the count. Free-running counter counts at some predetermined rate and displays the count on three LEDs. It does not serve any practical purpose, just a conversation piece. Est. cost: under $9. Experimenter's interface device. Part 3. Experimenting with input and output lines on a Commodore-64 computer. Projects include a sequential binary counter, alarm clock, power control, and alarm system. An infrared-detector event counter displays the running total on a digital numeric display. Integrated circuit binary counter. Low-cost, resettable digital readout counter. Properly conditioned, almost any square wave up to 10 MHz will trigger the counter. Est. cost: $12 per decade. High-speed decimal counter module with logic and Nixie tube readout. Est. cost: $15 per decade. Decimal counting circuit uses medium-scale integration, counts up or down and has storage provisions. Est. cost: $25 per decade. The "Executive Digital Temper Countdowner" displays numerals from zero to nine, then sounds an alarm. Photoelectric sensor. An in/out detection system counts events (up and down) and can be used to control lights, appliances, etc. Can count up to 9, 99, 999, or higher. Flip-flops and decade counters. Part 1. Theory and basic circuits. Flip-flops and decade counters. Part 2. Four easy-to-build LED projects. (1) Dual LED alternate blinker, (2) single led flasher, (3) simple six-bit binary counter and (4) wheel of fortune where a wheel of LEDs turn on in succession, gradually getting slower, until only one LED remains lit. Getting acquainted with CMOS IC's which require very little current to operate. A look at a CMOS astable multivibrator and a CMOS divide-by-ten counter/decoder circuit. Modifying electronic calculators to perform other functions, including: event-counter, timer, digital controller, etc. A look at the MC 14553B 3-decade BCD CMOS counter chip that can be used to make various event and frequency counters. Special counter circuits for experimenters. Various combinations of the basic J-K flip-flop circuits provide many useful digital counting schemes. Includes ring counters, shift counters, and up/down counters. Two circuits use a 7490 TTL decade counter and photocell to count people coming and going through a door. Digital electronics course. Flip-Flop applications in the real world. Experimental circuits include a level indicator, ripple counter, synchronous counter, and ring counter. Digital electronics course. Using flip-flops with counters. Getting counters to go past nine is easy with a flip-flop. Digital electronics course. Introduction to IC counter circuits. Learn how counters count, and how to use those IC's in your circuits. Interesting applications for the 4017 decade counter IC. An electro-optical shaft encoder. How to turn the rotation of a mechanical shaft into a signal that can be used by digital circuits. Build a BCD (binary-coded-decimal) number generator that incorporates a shaft encoder, pulse generator and counting circuits. Teaching digital counters to count. How to make a decade counter to count by some number base other than 10. Circuits are shown for getting a digital counter to reset itself after some number other than 10. Universal logic tester checks resistors, capacitors, transistors, audio and AM radio circuits. Use as digital pulsar or troubleshooting instrument. Use to test digital logic and counting circuits. Estimated cost: $10. All about selecting and using universal electronic counters/timers. Working with counters. An introduction to CMOS counters. How to solve the reset and duty-cycle problem when working with the inexpensive 4017 counter IC. More about counters (particularly the 4017 decade counter). A look at output duty-cycle and the 4018 counter IC. More on the 4018 programmable decade counter IC. Using the 4018 programmable decade counter IC. Extending the counting range of the 4017 CMOS MSE (medium scale integration) counter IC's. Special-purpose IC's. An examination of the "rate multiplier" which allows us to do all kinds of arithmetic. Part 1. The 4089 CMOS IC. Special-purpose IC's. An examination of the "rate multiplier" which allows us to do all kinds of arithmetic. Part 2. Designing counting circuits around the 4089 CMOS IC. Special-purpose IC's. An examination of the "rate multiplier" which allows us to do all kinds of arithmetic. Part 3. Designing counting circuits around the 4089 CMOS IC. Adding the display circuitry. Special-purpose IC's. An examination of the "rate multiplier" which allows us to do all kinds of arithmetic. Part 4. Doing division with rate multipliers and cascading the 4089 IC. Designing with digital IC's. Part 7. Counter circuits and how they work. Down-counter cookbook. Using presettable down-counters to design frequency dividers, frequency synthesizers and alpha-numeric displays. Working with counter circuits. Examples of counter/dividers which use CMOS D and JK flip-flops. How to cascade the 4017 CMOS to build a circuit using sequencing logic (decade counters, sequential counting, LED flasher, etc.). Walking-ring counters (Johnson counters). An introduction to a hardware circuit or a software routine which generates a unique count sequence in a simple, unusual, and quite sophesticated manner. Example circuits include signal generators and electronic dice. An electronic turns counter. Adapt a drill motor, sewing machine motor, or almost any series-wound universal motor to the task of winding your own coils. This circuit will count the number of revolutions of the motor and display the count on a digital LED display. Diagram shows the construction of a "hop tally" stick, used until the 1930's in England to count worker production. | |||||||||
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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