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Newly Updated Circuit Projects:

LM386 Amplifier Circuit [Working and Application Circuits]

Last Updated on May 15, 2026 by Swagatam 83 Comments

national semiconductor 1

The IC LM386 is a 8-pin tiny power amplifier chip, specially made for operating under relatively low voltage parameters, yet provide considerable amplification. IC LM386 amplifier circuit becomes suitable for applying in small low power audio gadgets like in FM radios, door bells, telephones etc. Let’s begin the IC LM386 amplifier explanation by studying its absolute maximum ratings […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Application, Circuits, LM386, Working

Battery Charger Problems Troubleshooting Discussed

Last Updated on May 17, 2026 by Swagatam 14 Comments

battery charger circuit

The included battery charger circuit was designed and built by Mr.Vinod Chandran, however there’s some issues and problems  with the circuit the troubleshooting of the same is addressed in this article. I have explained the discussion between Vinod and me. Discussing a Transistor Battery Charger Problem Vinod: I am attaching the circuit image of the […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Discussed, Problems, Troubleshooting

Make a Football Electricity Generator Circuit

Last Updated on May 21, 2026 by Swagatam 5 Comments

footballelectricity

The explained football electricity generator circuit was developed by me in response to the request sent by one of the readers Mr.Bright. Though I am not sure if the explained concept would actually give the intended results, it’s worth trying as it’s quite easy to understand and build. Designing the Generator There were three things that I had to consider while designing the […]

Filed Under: Energy from Magnets and Earth, Games and Sports Projects Tagged With: Electricity, Football, Generator

5 Best 6V 4Ah Automatic Battery Charger Circuits Using Relay and MOSFET

Last Updated on May 17, 2026 by Swagatam 337 Comments

The following 5 versions of 6 volt 4 AH battery charger circuits has been designed by me and posted here in response to the request from Mr. Raja, I have explained the whole conversation. Technical Specifications “Dear sir, please post a circuit to charge 6 volt 3.5 ah lead acid battery from 12 volt battery. […]

Filed Under: Battery Charger Circuits Tagged With: 4Ah, Automatic, Battery, Best, Charger, Circuits

How to Replace a Transistor (BJT) with a MOSFET

Last Updated on May 20, 2026 by Swagatam 99 Comments

pinout

In this post I have explained the method of correctly replacing a BJT with a MOSFET, without affecting the final outcome of the circuit. Introduction Until MOSFETs arrived in the field of electronics, transistors or BJTs to be precise ruled the power switching circuits and applications. Though even Bipolar Junction Transistors (BJTs) can not be […]

Filed Under: Electronics Theory Tagged With: BJT, MOSFET, Replace, Transistor

Sec Exciter Powered HV Capacitor Charger Circuit

Last Updated on May 17, 2026 by Swagatam 1 Comment

NEW SEC EXCITOR POWERD HV CAP CHARGER WITH HV DC OUTPUT 001

My friend Steven has updated a few more of his findings related to his sec exciter experiment, I have explained more what Mr. Steven has to say. NEW SEC EXCITER POWERED HV CAP CHARGER WITH HV DC OUTPUT Here’s the newest circuit originally it was a 3 piece circuit i found on YouTube so i modified it and upgraded […]

Filed Under: Battery Charger Circuits Tagged With: Capacitor, Charger, Exciter, HV, Powered

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