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Monitor

Automotive Sensor Monitor Circuit Diagram

Last Updated on January 27, 2025 by Swagatam Leave a Comment

This fascinating Automotive Sensor Monitor Circuit was created and shared with me for publication by a devoted reader of this blog and passionate electronics enthusiast, Mr. August Peterson. I sincerely appreciate Mr. August’s valuable and generous contribution to this site. Overview Automotive diagnostic code readers are invaluable in displaying what the vehicle electronic control unit […]

Filed Under: Automobile Electronics Tagged With: Automotive, Monitor, Sensor

AC 220V Over Current Monitor and Cut OFF Circuit

Last Updated on January 1, 2024 by Swagatam 12 Comments

220V load circuit breaker track side PCB

The proposed AC mains 220 V load over current cut off circuit continuously monitors the current flowing through a connected load. If this current increases beyond a certain preset level, the circuit trips the relay and disconnects the load from the AC. Basic Working This 220 V over current cut off circuit is indeed subject […]

Filed Under: Security and Alarm Tagged With: 220V, AC, Current, Monitor, OFF, Over

Child Crying Monitor Circuit using Power Line Communication

Last Updated on March 22, 2023 by Swagatam 2 Comments

child cry detector circuit

In this child crying monitor circuit when the baby wakes up in their room, the parents are immediately notified, even if they are in another room of their home. A sensor detects the crying sound accompanying the wake-up. After appropriate processing, it sends a signal through the 220V power lines. The receiver, connected to any […]

Filed Under: Security and Alarm Tagged With: Child, communication, Crying, Line, Monitor, Power

Extremely Low Frequency (ELF) Radiation Monitor Circuit

Last Updated on February 8, 2023 by Swagatam Leave a Comment

ELF monitor circuit

ELF stands for Extremely Low Frequency, which is an electromagnetic radiation generated by most of out household electrical equipment. Regarding the effect and severity of ELF fields on human health, debate remains heated. However, I believe there is enough data for us enthusiasts to adopt a conservative stance on the level of exposure we must […]

Filed Under: Sensors and Detectors Tagged With: ELF, Extremely, Frequency, Monitor, Radiation

Ni-Cd Low Battery Monitor Circuit using Lambda Diode

Last Updated on September 21, 2020 by Swagatam 5 Comments

graph

The main feature of this lambda-diode low battery indicator for Ni-Cd batteries is that, the circuit itself consumes almost zero current, until the set low threshold level is reached and the indicator LED is illuminated. This feature makes the circuit very suitable for many low voltage battery operated systems, like radios, watches, timers, alarms, remote […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Diode, Lambda, Monitor

Mains High Low Voltage Protection Circuit with Delay Monitor

Last Updated on January 30, 2024 by Swagatam 161 Comments

opamp2BV

In this post I have explained an upgraded version of my previous mains 220V/120V high-low voltage cut off protection circuit which now includes a delayed restoration of power for the load with 3 LED power status indicators. The idea was requested by one of the dedicated members of this website. Circuit Objectives and Requirements Main […]

Filed Under: Security and Alarm Tagged With: Delay, High, Mains, Monitor, Protection, Voltage

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