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Op Amp Battery Charger Circuits with Auto Cut Off

Last Updated on August 7, 2023 by Swagatam 401 Comments

In this post I have explained a two op amp IC 741 and LM358 based auto cut off battery charger circuits which are not only accurate with its features but also allows a hassle free and quick setting up of its high/low cut-off threshold limits. High current batteries can e also charged using these circuits. […]

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

How to Set IC 741 for Auto Cut-oFF

Last Updated on July 15, 2019 by Swagatam 102 Comments

pcb 1

In this post I have explained how to set or adjust an opamp 741 IC based battery charger circuit for implementing an automatic cut-off for the connected battery once it reaches the full-charge level. Since I have many such IC 741 battery charger circuits posted here, the instructions will be helpful for correctly setting up […]

Filed Under: Battery Charger Circuits Tagged With: 741, Auto

Solving Inverter “No Load Auto-Shutdown” Problem

Last Updated on August 3, 2020 by Swagatam 14 Comments

no2Bload

In this post I have explained how to trick an inverter’s “no load auto-shutdown” feature through an external circuit so that the inverter may be kept running even with minor, below permissible loads at the output. The idea was requested by Mr. Em. Technical Specifications Thanks for your prompt responses and guidance. I was wondering […]

Filed Under: Inverter Circuits Tagged With: Auto, Inverter, Load, Problem, Shutdown, Solving

Power Switch ON Alarm with Auto OFF Circuit

Last Updated on July 6, 2019 by Swagatam 17 Comments

In this post I have explained a simple monostable based power switch ON alarm circuit which automatically switches OFF after an adjustable preset delay. The idea was requested by Mr. Will Boswell. Technical Specifications Hi there, my name is Will Boswell. I am currently working on a project that involves adding an alarm sounder to […]

Filed Under: Security and Alarm Tagged With: Alarm, Auto, OFF, ON, Power, Switch

Cellphone RF Triggered Car Amplifier Auto-Mute Circuit

Last Updated on January 8, 2024 by Swagatam 4 Comments

car amp mute cell phone

The following article presents a circuit design which would mute your car amplifier music the moment it detects a cellphone call inside the car, enabling an automatic muting during the situations, and saving the user from the manual hassles. A loud music could be a nuisance while a phone call is being attended or dialed. […]

Filed Under: Automobile Electronics Tagged With: Amplifier, Auto, Cellphone, Mute, RF, Triggered

Timer Circuits with Auto Pause and Memory During Power Failures

Last Updated on July 6, 2019 by Swagatam 35 Comments

timerpowermainsfailurecorrection

In this post we try to investigate a couple of  innovative solutions which could be used for pausing the counting process of a timer IC during power failures, and also restart the process when mains is restored, ensuring a continuous functioning of the timer without errors. The idea was requested by Mr. Arun Dev. Technical […]

Filed Under: Timer and Delay Relay Tagged With: Auto, Circuits, During, Memory, Pause, Timer

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