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Indicator Circuits

Flashing LED Battery Low Indicator Circuit

Last Updated on January 8, 2024 by Swagatam 36 Comments

In this post I have explained a simple low/normal battery voltage status indicator circuit through a flashing and a constant LED, where the flashing LED indicates a normal status while the solid indicator warns against a low battery condition. The idea was requested by Mr.Alf. Technical Specifications Hi, I found and built your “Low Battery […]

Filed Under: Indicator Circuits Tagged With: Battery, Flashing, Indicator, LED

Car Radiator Hot Indicator Circuit

Last Updated on January 8, 2024 by Swagatam 3 Comments

car radiator indicator circuit 1

The proposed circuit is very useful which warns the car driver before hand once the radiator gets heated up above the preset level. How it Works The working of this circuit is very simple and works off on the car battery. The familiar IC555 is used here which is the heart of the circuit. The […]

Filed Under: Automobile Electronics, Indicator Circuits Tagged With: Indicator, Radiator

Bird in the Nest Indicator Circuit

Last Updated on January 2, 2024 by Swagatam 4 Comments

bird in the nest indicator

In this post I have explained a simple infrared based proximity sensor circuit which is implemented to study birds and their behavior, by installing the circuit beside artificially made bird nests. The idea was requested by Mr. Jan Simberg. Technical Specifications I hope you have time to read these few lines. First of all thanx […]

Filed Under: Indicator Circuits Tagged With: Bird, Indicator, Nest

Car Speed Limit Warning Indicator Circuit

Last Updated on January 8, 2024 by Swagatam 30 Comments

carspeedlimitindicatorcircuit

In the following post I have explained a simple yet useful car speed limit warning indicator circuit which can be used in vehicles for getting an instant indication of a possible over speed limit conditions. The idea was requested by Mr. Abu-Hafss. Technical Specifications: Shall appreciate, if you could design a circuit to warn with […]

Filed Under: Automobile Electronics, Indicator Circuits Tagged With: Indicator, Limit, Speed, Warning

Simple Water Level Indicator Circuits (with Images)

Last Updated on January 8, 2024 by Swagatam 99 Comments

IC 4049 pinout diagram

A water level indicator is an electronic circuit which indicates the various levels of water inside a tank. This happens when rising or dropping water levels come in contact with the respective water sensors arranged step wise inside the water tank at different depths. In this post I have explained 2 interesting ways to make […]

Filed Under: Indicator Circuits, Water Controller Tagged With: Circuits, Images, Indicator, Level, Simple, Water

IC 741 Low Battery Indicator Circuit

Last Updated on February 17, 2025 by Swagatam 211 Comments

Low voltage Indicator 1

The proposed circuit was requested by one of the avid readers of my blog. It is a low battery warning indicator circuit using op amp IC 741 and can be used for monitoring a particular low battery voltage threshold. Circuit Operation The circuit may be understood with the following points: The entire configuration is wired […]

Filed Under: Indicator Circuits Tagged With: 741, Battery, Indicator

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