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New Circuit Projects

3.7 V Li-Ion Battery Charger Circuit with Automatic Cut-off

Last Updated on November 2, 2024 by Swagatam 394 Comments

Li ion USB charger circuit

In this article we study a simple 3.7V li-ion battery charger circuit with auto-cut off, which can be charged from your computer USB port or any other 5 V regulated source. How it Works The circuit can be understood with the help of the following description: The IC LM358 is configured as a comparator. The […]

Filed Under: Battery Charger Circuits Tagged With: Automatic, Battery, Charger

Vehicle Speed Limit Alarm Circuit

Last Updated on January 8, 2024 by Swagatam 18 Comments

In our previous articles we have learned comprehensively regarding the ICs LM2907/LM2917 which are fundamentally frequency to voltage converter ICs, and are ideally applicable in all such relevant fields. Here we see how the same chip can be applied for making a vehicle speed limit alarm circuit. Using a Single IC for Speed Detection As […]

Filed Under: Automobile Electronics Tagged With: Alarm, Limit, Speed, Vehicle

Accurate Speedometer Circuit

Last Updated on May 30, 2022 by Swagatam 30 Comments

Speedometer

Here we’ll see how a simple yet accurate analogue speedometer circuit can be constructed at home using just a single IC and a few external passive components. The speedometer can be universally used with all 2-wheeler, 3-wheeler, even in bicycles for indicating their speeds. Using Frequency to Voltage Converter In my previous article I have […]

Filed Under: Automobile Electronics, Meters and Testers Tagged With: Accurate, Speedometer

Tilt Sensor Switch Circuit

Last Updated on June 14, 2019 by Swagatam 4 Comments

tiltsensorcircuit

The articles presents a simple water triggered switch which is effectively implemented as a super simple tilt sensor circuit. Let’s know more. Easy to Build Circuit Ready availability of cost effective components can be deployed to fabricate tilt sensor alarm in ultra transistor based simple circuit. The domestic version of tilt sensor explained here is […]

Filed Under: Sensors and Detectors Tagged With: Sensor, Switch, Tilt

High Voltage, High Current Transistor TIP150/TIP151/TIP152 Datasheet

Last Updated on January 1, 2020 by Swagatam 11 Comments

TIP152 darlington

The TIP150, TIP151, TIP152 series are high voltage, high current Darlington transistors which can be used for applications involving voltages at mains 120V or 220V levels. The datasheet and other related details can be read in the following article. The typical applications of this transistor could be for high voltage motor control, automotive ignition, inverter […]

Filed Under: Datasheets and Components Tagged With: Current, High, TIP150, TIP151, Transistor, Voltage

Fading an LED ON/OFF – Arduino Basics

Last Updated on December 5, 2024 by Swagatam 2 Comments

simplefade pin9 schem

In this post I have explained a basic Arduino function where I have explained the process of fading an LED ON/OFF through some basic code implementations. Creating a Fading Effect We see how to use an analogwrite() function in order to implement a fading ON/OFF of an LED. The function incorporates PWM pulses across a […]

Filed Under: Arduino Projects, Lamps and Lights Tagged With: Arduino, Basics, Fading, LED, OFF, ON

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