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Newly Updated Circuit Projects:

Automatic Sliding Gate Controller Circuit

Last Updated on July 22, 2025 by Swagatam 86 Comments

slider2Bgate2Bcontroller

In this post we investigate a circuit, designed for implementing an automatic sliding gate or door action, and includes a set of features as specified in the request. The idea was suggested by Mr. Andreas. Technical Specifications Can you help me to design a simple sliding gate controller. How can work its like this…Press a […]

Filed Under: Automation Projects Tagged With: Automatic, Controller, Gate, Sliding

How to make a Transistor Latch Circuit

Last Updated on July 19, 2025 by Swagatam 179 Comments

Latch 2

In this post I have explained how to make a simple transistor latch circuit using just two BJTs and a few resistors. Introduction A transistor latch is a circuit which latches ON with a permanent high output in response to a momentary input high signal, and continues to stay in this position as long as […]

Filed Under: Electronics Theory Tagged With: Latch, Transistor

3 Best Joule Thief Circuits

Last Updated on July 14, 2025 by Swagatam 127 Comments

JouleThiefbyStevenChiverton

A joule thief circuit is basically an efficient, self-oscillating voltage booster circuit, built using a single transistor, resistor and an inductor, which can boost voltages as low as 0.4 V from any dead AAA 1.5 cell, to much higher levels. Technically it may seem impossible to illuminate a 3.3 V LED with a 1.5V source, […]

Filed Under: Lamps and Lights Tagged With: Best, Circuits, Joule, Thief

Bidirectional Switch

Last Updated on July 13, 2025 by Swagatam 77 Comments

bidirectional switch symbbol

In this post I have explained about MOSFET bidirectional power switches, which can be used for operating a load across two points bidirectionally. This is simply done by connecting two N-channel, or P-channel MOSFETs back to back in series with the specified voltage line. What is a Bidirectional Switch A bidirectional power switch (BPS) is […]

Filed Under: Power Supply Circuits Tagged With: Bidirectional, Switch

Dual Battery Charger Circuit with Isolator

Last Updated on July 13, 2025 by Swagatam 96 Comments

battery1battery2changeovercircuit

In this post I have explained an innovative automatic dual battery charger with isolator circuit for alternators and engines, which allows monitoring of the charge levels of two individual batteries, and switching them across the loads appropriately. [New Entry] Single Op amp Dual Battery Charger Circuit The circuit working for the above single op amp […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Dual, Isolator

How to Create Air Gap in a Ferrite Core Transformer

Last Updated on July 12, 2025 by Swagatam 2 Comments

In this article we are going to understand in detail how we can create air gap in a ferrite core based transformer which we are using in smps circuits like flyback or boost or forward type. Introduction We must understand that ferrite cores have very high permeability and they saturate very fast if we do […]

Filed Under: SMPS and Converters Tagged With: Core, Create, Ferrite, Transformer

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