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Newly Updated Circuit Projects:

Single Transformer Inverter/Charger Circuit

Last Updated on May 17, 2026 by Swagatam 243 Comments

singletransformerinverterchargerchangeovercircuit

In this post I have explained how to build an innovative inverter circuit with a single transformer that works both as an inverter and a battery charger transformer, I have explained the details from the following discussion. The Circuit Objective Though you may find many inverters having an integral battery charger, the section will mostly […]

Filed Under: Battery Charger Circuits Tagged With: Charger, Inverter, Single, Transformer

Cell Phone Emergency Charger Pack using Ni-Cd Batteries

Last Updated on May 17, 2026 by Swagatam 62 Comments

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In this post  I have explained the construction of a simple emergency charger pack using Nicket Cadmium (Ni-Cd) batteries for your cellphones and smart phones for emergency charging of your cellphone, so that next time you are never stuck on a highway with a full discharged dead cellphone battery. Circuit Concept It often happens, our […]

Filed Under: Battery Charger Circuits Tagged With: Batteries, Cell, Charger, Emergency, Pack, Phone

Simple 48V Automatic Battery Charger Circuit

Last Updated on May 17, 2026 by Swagatam 422 Comments

The proposed 48 V automatic battery charger circuit will charge any 48 V battery up to an optimal 56 V full charge level, utilizing very ordinary components. The circuit is highly accurate with  its over charge cut off features. Circuit Description: As shown in the circuit diagram, the main element in the circuit is the opamp IC 741, which has been arranged as a comparator. Pin#3 […]

Filed Under: Battery Charger Circuits Tagged With: 48V, Automatic, Battery, Charger, Simple

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

Zero Drop LDO Solar Charger Circuit

Last Updated on May 17, 2026 by Swagatam 272 Comments

In this article I have explained a simple low dropout LDO, or zero drop solar charger circuit without microcontroller which can be modified in many different ways as per user preference. The circuit does not depend on microcontroller and can be built even by a layman. What is a Zero Drop Charger A zero drop […]

Filed Under: Battery Charger Circuits, Solar Controller Circuits Tagged With: Charger, Drop, LDO, Solar, Zero

How to Calculate Solar Panel, Inverter, Battery Parameters

Last Updated on May 17, 2026 by Swagatam 170 Comments

Grid Tie Inverter2C Wiring Details2C Diagram

In this post I have explained through calculations how to select and interface the solar panel, inverter and charger controller combinations correctly, for acquiring the most optimal results from the set up. Calculating Solar Panel, Inverter and Battery Charger Specifications For the sake of convenience, let’s believe you possess a a 100 watt appliance or […]

Filed Under: Battery Charger Circuits, Inverter Circuits, Solar Controller Circuits Tagged With: Battery, Calculate, Inverter, Panel, Parameters, Solar

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