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Newly Updated Circuit Projects:

Make this 18V Cordless Drill Battery Charger Circuit

Last Updated on May 17, 2026 by Swagatam 60 Comments

pcb

In this post I have explained how to build and use a 18V battery charger circuit for a cordless drill machine. The idea was requested by Mr. Chibuzo. Technical Specifications The Design Whether it’s a lead acid battery, a Ni-Cd or a Li-ion, this multipurpose battery charger shown below can be applied for any of […]

Filed Under: Battery Charger Circuits Tagged With: 18V, Battery, Charger, Cordless, Drill

How to Set IC 741 for Auto Cut-oFF

Last Updated on May 17, 2026 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

Battery Bank Charger Circuit

Last Updated on May 17, 2026 by Swagatam 37 Comments

Power2BPack

The post narrates an automatic Battery Bank charger circuit with an automatic over charge cut-off feature for operating with an electric car. The idea was requested by Mr. George. Circuit Objectives and Requirements I’m George From Australia trying to convert small car into an electric car. The attached PDF show the configuration of lithium battery […]

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

Accumulators Explained [Rechargeable Batteries]

Last Updated on May 17, 2026 by Swagatam 10 Comments

accumulator with electrolyte and electrodes

Unlike dry batteries, whose stored electrical energy can only be used once, accumulators have the immense advantage of reversibility, which translates into the possibility of a series of charge/discharge cycles. This means that they can undergo a series of charge/discharge cycles. They are found in applications that may require more power, such as starting the […]

Filed Under: Battery Charger Circuits Tagged With: Accumulators, Batteries, Explained, Rechargeable

Simple SCR Battery Charger Circuit

Last Updated on May 17, 2026 by Swagatam 31 Comments

SCR compressed

In this post I have explained a simple yet accurate SCR triggered battery charger circuit which can be used effectively for charging all types of battery, which includes, lead acid battery, Ni-Cd battery banks, Li-Ion battery, etc. This SCR charger can be seen implemented in most automobile garages, and is very popular among auto mechanics, […]

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

Gel Cell Battery Charger Circuit [Constant Current, Constant Voltage]

Last Updated on May 17, 2026 by Swagatam 42 Comments

Fig 1

In this post I have explained what are gel cell batteries and also learn how to build a specialized charger for charging a gel cell battery, with full calculations. The proposed circuit works in two modes: it starts charging a discharged gel cell battery with constant current, until the full charge voltage is reached across […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Cell, Charger, Constant, Current, Voltage

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