|
 |
 |
 |
|
 |
|
 |
|
|
Last Updated
03/31/2019
Sitemap
|
|||||||||
Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
|||||||||
|
LOGIC PROBE xx DIGITAL ELECTRONICS TESTING The built-in logic tester. Use it to troubleshoot home computers. An audible logic test probe. Emits a low tone for low state and a higher tone for high state. Build a simple digital oscilloscope. Incorporates the function of a digital-logic probe, but also allows comparison of selected signals with the computer system clock. Build a talking logic probe. This digital troubleshooting tool lets you concentrate on the circuit under test, rather than on a LED display, when making logic-level tests. Four word vocabulary consists of HIGH, LOW, OPEN and CLOCK. Est. cost: $50. Use a 555 timer IC to build a junk box logic probe. Circuit for a logic tester with an audible indicator. Digital logic probe is built from two chips and a handfull of assorted support components. Provides both logic-level indication and pulse detection. Draws power from the circuit under test. Est. cost: $15 (kit). Experimenter's digital logic probe has all the features of commercial models. Fits into a plastic toothbrush case. Est. cost: $10. Simple circuit for a missing-pulse detector triggers an output when there's a loss of signal at its input. Uses a 555 IC. Test digital circuits with the SmartProbe. This logic probe has the ability to resolve voltages to four levels and keep a history of the last 20 readings. It is used by connecting to the parallel port of any PC. Est. cost: $15. Circuit for a simple logic probe uses two LED's to show 0 or 1. Bargin priced logic probe will signal high level, low level and oscillation, but lacks pulse detection. Est. cost: $2. Digital logic probe. Est. cost: $15. Assembling and using the Mullen Extender Board with built-in logic probe. Probos V. Build this improved logic probe which will do five things: Indicate logic 0 states, indicate logic 1 states, indicate Tri-state outputs, detect both positive and negative pulse transitions, and work with TTL and TTL-compatible circuits. Est. cost: $5. Looker. A low-cost digital logic probe you build. Est. cost: $20. A multi-channel TTL logic tracer. Digital test instrument incorporates six "logic-probe" channels and can be expanded as needed. Logic probe. Detects the presence of discrete voltage outputs (1 and 0) in a digital circuit. Circuit and probe are housed in a small plastic vial. Assemble a low-cost logic probe. LED's indicate the presence of 0 or 1 logic, while the presence of a high-speed pulse will turn on a third LED. Integrated circuit digital logic memory probe indicates logic state of circuit and detects pulses as short as 50-ns. Est. cost: $18. Build a universal digital probe. Test virtually any digital logic family at speeds up to 10 MHz. It will check for a logic 1 or 0 within 5mV of a set value. Build a direct-reading logic probe. Seven-segment readout displays high, low, open and pulse by means of the letters H, L, O, and P. A simple logic probe uses LEDs instead of seven-segment display, thus eliminating some problems and making the probe more versatile. Compact, easy-to-use logic probe fits on the end of your finger. Circuit for a logic test probe for checking TTL circuits. A basic guide to digital logic probes, clips, and pulsers. How to use low-cost digital test equipment. Build an audible logic probe. Two-tone device "beeps" for high and low logic levels, and "warbles" for pulse trains. Circuit for a simple logic transition (pulse) detector for TTL circuits. Audible pulse indicator circuit. Similar to a logic probe, it provides both visual and audible indication of the presence of pulses. Logic probe uses 10 stepped LEDs to indicate analog or digital voltages. Est. cost: $20. Logic probe is enclosed in a clear plastic vial. Two test lamps are used to verify a ground or a preset voltage range. Build a digital logic probe with all the features of commercially available units. Est. cost: $10. Three-in-one test set combines a signal injector, logic probe, and an audio signal tracer. TTL testing tool circuit is an improvement to a logic probe. It not only signals a pulse, but it saves the pulse by incrementing a 3-digit display so you can see how many pulses have gone by. Build a hand-held four-channel logic probe that can indicate whether each of four test points is high, low, toggling, or open. Digital logic probe is housed in a plastic coin-holder tube. Build a high-speed (125-MHz) digital-logic probe. Est. cost: $20 (kit). Circuit for a simple logic probe. Build a 3-state logic probe. Versatile logic probe circuit. Logic probe (or positive voltage sensor) circuit will sound a buzzer and light an LED whenever it senses voltage greater than 1.5 volts. Logic probe for testing digital integrated circuits emits an audible tone to denote low and high logic levels. Est. cost: $16. Logic probe for testing TTL digital IC's. Est. cost: $1. Build this $10 logic probe. It fits inside of a clear plastic probe case. Circuit for a versatile, low-cost logic probe. Est. cost: $6. Circuit for a logic tester with an audible indicator can be used to troubleshoot TTL or CMOS logic. Build a simple logic probe. Design uses two LM339 voltage-comparator ICs and a few resistors. Part 1. Build a simple logic probe. Part 2. Add an audible indicator. Build a simple logic probe. Part 3. Printed circuit board design. Digital debugging. How to locate defective ICs by means of a digital logic probe. | |||||||||
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. |
|||||||||