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RPM Controller Circuit for Diesel Generators

Last Updated on July 6, 2019 by Swagatam 19 Comments

The post discusses a diesel generator RPM controller circuit for boats using PWM technique and also using a simple triac shunt circuit. The idea was requested by Mr. Dave. Circuit […]

Filed Under: 324 IC Circuits, 555 IC Circuits, Motor Controller

How to Interface 4×4 Keypad with Arduino

Last Updated on July 6, 2019 by Swagatam

In this post we are going to learn how to interface a 4×4 keypad with Arduino. We are going to see what is a keypad, how it is constructed and […]



Filed Under: 324 IC Circuits, Arduino Engineering Projects

How to Make a Simple Math Calculator using Arduino

Last Updated on February 23, 2020 by Swagatam

In this post, we are going to construct a calculator using Arduino, which can perform far complex arithmetical calculation than an ordinary calculator. The motto of this post is not […]

Filed Under: 324 IC Circuits, Arduino Engineering Projects, Simple Circuits

How to Build a Microphone Amplifier Circuit

Last Updated on May 5, 2022 by Swagatam 20 Comments

In this article we are going to see how to build a microphone amplifier circuit with operational amplifier LM324. This circuit can be used as good pre-amplifier for audio projects. […]

Filed Under: 324 IC Circuits, Audio and Amplifier Projects

Battery Backup Time Indicator Circuit

Last Updated on July 15, 2019 by Swagatam 2 Comments

The post explains a battery backup time indicator circuit for monitoring the battery power usage by the connected load and for estimating the approximate remaining backup time of the battery. […]

Filed Under: 324 IC Circuits, Battery Chargers, LM3915 IC

Synchronized 4kva Stackable Inverter

Last Updated on August 3, 2020 by Swagatam 41 Comments

This first part of the proposed 4kva synchronized stackable inverter circuit discusses how to implement the crucial automatic synchronization across the 4 inverters with regards to frequency, phase and voltage […]

Filed Under: 324 IC Circuits, 4017 IC Circuits, Inverter Circuits



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