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Newly Updated Circuit Projects:

Constant Torque Motor Speed Controller Circuit

Last Updated on June 30, 2026 by Swagatam 28 Comments

motor speed with constant torque

In this post I have explained a DC Motor controller which features a constant torque compensation for enabling the motor to run at a consistent speed irrespective of the load on it. Drawback of Ordinary Speed Controllers One drawback of the majority of simple speed controllers is they only provide the motor with a predetermined […]

Filed Under: Motor Controller Tagged With: Constant, Controller, Motor, Speed, Torque

Simple Ni-Cd Battery Charger Circuits Explored

Last Updated on May 17, 2026 by Swagatam 116 Comments

Nicd Charger circuit

In this post I have explained many simple NiCd charger circuits with an automatic overcharge protection and a constant current charging. When it comes to correctly charging a Nickel-Cadmium cell, it is strictly recommended that the charging process is halted or cut off as soon as it reaches the full charge level. Not following this […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Circuits, Explored, Simple

Remote Control using Mains Power Line Communication

Last Updated on May 12, 2023 by Swagatam 44 Comments

main communication reciever

The proposed circuit will allow you to remotely control a mains AC operated appliance across rooms of your home through mains power line communication or PLC concept. In PLC technology, an electronic circuit which works as a transmitter is plugged-in to the mains wiring (220 V or 120 V) injects a modulating high frequency data […]

Filed Under: Remote Control Circuits Tagged With: communication, Control, Line, Mains, Power, Remote

Cup Full Indicator Circuit for the Visually Challenged

Last Updated on June 1, 2026 by Swagatam 13 Comments

cup full buzzer

This circuit basically is a fluid level alarm indicator intended for alerting visually impaired individuals regarding the liquid level in a container such as cup, glass or bowl. The unit can be simply hooked up across the rim of any container with the probes such that it detects the full level liquid in it while […]

Filed Under: Indicator Circuits Tagged With: Challenged, Full, Indicator, Visually

Regulated Car Battery Charger Circuit for Garage Mechanics

Last Updated on May 17, 2026 by Swagatam 91 Comments

car battery charger for garage mechanics

If you are an automotive technician, vehicle technician, or a motor mechanic, you may find this cheap yet powerful car battery charger circuit extremely handy, as it can be used for charging all types of car and motorcycle battery overnight with minimum effort. This charger is specially suited for garages since it has a rugged […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Garage, Mechanics, Regulated

Pressure Switch Water Pump Controller Circuit

Last Updated on February 18, 2020 by Swagatam 17 Comments

pump

A pressure switch is a device which can be used for detecting water pressure in a tank and operate a water pump motor when the pressure gets too low, or the water in the tank goes lower than a desired minimum level. In this post I have explained a water pressure controller circuit for maintaining […]

Filed Under: Water Controller Tagged With: Controller, Pressure, Pump, Switch, Water

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