Measuring Circuits
eBook - ePub

Measuring Circuits

  1. 240 pages
  2. English
  3. ePUB (mobile friendly)
  4. Available on iOS & Android
eBook - ePub

Measuring Circuits

About this book

This series of circuits provides designers with a quick source for measuring circuits. Why waste time paging through huge encyclopedias when you can choose the topic you need and select any of the specialized circuits sorted by application?This book in the series has 250-300 practical, ready-to-use circuit designs, with schematics and brief explanations of circuit operation. The original source for each circuit is listed in an appendix, making it easy to obtain additional information. - Ready-to-use circuits - Grouped by application for easy look-up - Circuit source listings

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Yes, you can access Measuring Circuits by Rudolf F. Graf in PDF and/or ePUB format, as well as other popular books in Design & Industrial Design. We have over one million books available in our catalogue for you to explore.

Information

Publisher
Newnes
Year
1996
Print ISBN
9780750698825
eBook ISBN
9780080511344
Topic
Design
Subtopic
Industrial Design
1

Battery Monitoring Circuits

Battery Status Indicator
Low-Battery Indicator I
Low-Battery Indicator II
Battery-Level Indicator
Battery-Threshold Indicator
Voltage-Detector Relay for Battery Charger
Battery-Charge/Discharge Indicator
Precision Battery-Voltage Monitor for HTS
Low-Voltage Monitor
Undervoltage Indicator for Battery-Operated Equipment
Battery-Condition Indicator
Equipment-On Reminder
Battery-Voltage Monitor
Battery Monitor
Lithium Battery State-of-Charge Indicator
Step-Up Switching Regulator for 6-V Battery
Dynamic, Constant-Current Load for Fuel Cell/Battery Testing
Car Battery-Condition Checker
Car-Battery Monitor
Car Battery-Condition Checker
Car-Battery Monitor
The sources of the following circuits are contained in the Sources section, which begins on page 217. The figure number in the box of each circuit correlates to the source entry in the Sources section.

BATTERY STATUS INDICATOR

image
Fig. 1-1 ELECTRONIC ENGINEERING
This indicator continually monitors the battery voltage during use and consumes only about 250 μA (until the end point is reached). Near the end point, Tr1 turns off, allowing Tr2 to illuminate the LED to increase current drain, which further leads to a distinct turn-off point.

LOW-BATTERY INDICATOR I

image
Fig. 1-2 ELECTRONIC ENGINEERING
Under good battery conditions, the LED is off. As the battery voltage falls, the LED begins to flash until, in the low-battery condition, the LED lights continuously. Designed for a 9-V battery, with the values shown the LED flashes from 7.5 to 6.5 V.

LOW-BATTERY INDICATOR II

The indicator flashes an LED when the battery voltage drops below a certain threshold. The 2N4274 emitter-base junction serves as a zener, which establishes about 6 V on the L161’s positive input. As the battery drops, the L161 output goes high. This turns on the Darlington, which discharges C1 through the LED. The interval between flashes is roughly two seconds and gives a low-battery warning with only 10-μA average power drain.
image
Fig. 1-3 SILICONIX

BATTERY-LEVEL INDICATOR

image
Fig. 1-4 NATIONAL SEMICONDUCTOR

BATTERY-THRESHOLD INDICATOR

image
Fig. 1-5 NATIONAL SEMICONDUCTOR

VOLTAGE-DETECTOR RELAY FOR BATTERY CHARGER

image
Fig. 1-6 ELECTRONIC ENGINEERING
While the battery is being charged, its voltage is measured at V. If the measured voltage is lower than the minimum, the relay will be energized, which will connect the charger circuit. When...

Table of contents

  1. Cover image
  2. Title page
  3. Table of Contents
  4. Other Books in this Series
  5. Copyright
  6. Introduction
  7. Chapter 1: Battery Monitoring Circuits
  8. Chapter 2: Comparator Circuits
  9. Chapter 3: Bridge Circuits
  10. Chapter 4: Capacitance Measuring Circuits
  11. Chapter 5: Counter Circuits
  12. Chapter 6: Current-Measuring Circuits
  13. Chapter 7: Dip-Meter Circuits
  14. Chapter 8: Display Circuits
  15. Chapter 9: Field-Strength Meter Circuits
  16. Chapter 10: Frequency-Measuring Circuits
  17. Chapter 11: Indicator Circuits
  18. Chapter 12: Light-Measuring Circuits
  19. Chapter 13: Measuring and Test Circuits
  20. Chapter 14: Oscilloscope Circuits
  21. Chapter 15: Power-Measuring Circuits
  22. Chapter 16: Probe Circuits
  23. Chapter 17: Resistance and Continuity-Measuring Circuits
  24. Chapter 18: Signal-Injector Circuits
  25. Chapter 19: Tachometer Circuits
  26. Chapter 20: Temperature Measuring Circuits
  27. Chapter 21: Voltage-Indicator/Monitor Circuits
  28. Sources
  29. Index