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Newly Updated Circuit Projects:

Battery Cut Off Charger Circuit Using a Single Relay

Last Updated on May 17, 2026 by Swagatam 31 Comments

simplestbatterychargercircuit

Amazed to hear this! Yep that’s actually possible, you would need only one relay and a handful of diodes to make a simplest one relay automatic battery charger circuit. How it Works The idea struck me while trying to design the easiest possible battery charger circuit for one my clients. The concept is simple; just […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Relay, Single

Selectable 4 Step Low Voltage Battery Cut off Circuit

Last Updated on May 17, 2026 by Swagatam 12 Comments

battery charger circuit

In this post I have explained a circuit configuration which facilitates a multi-step low voltage selection and cut-off for the battery being used and monitored. The circuit was proposed by Mr. Pete. Technical Specifications Dear Swagatam,Your assistance during the past few days has been incredible, thanks to which I think I have managed to get close to […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Selectable, Step, Voltage

Convert SMPS into a Solar Charger

Last Updated on May 17, 2026 by Swagatam 51 Comments

chargingbatteryfromsmpssolarchargercircuit.

In this post I have explained how to convert smps into a solar charger circuit. The method will result in an extremely efficient and fast solar charging of the connected battery. SMPS Solar Chargers SMPSs have become very common nowadays and we find them being used in the form of AC to DC adapters wherever […]

Filed Under: Battery Charger Circuits, Solar Controller Circuits Tagged With: Charger, Convert, SMPS, Solar

Charging a Cellphone battery with a Laptop Battery

Last Updated on May 17, 2026 by Swagatam 5 Comments

cellphonechargerfromlaotpbatt 1

The post presents a simple circuit that may be used for charging a cellphone battery with a laptop battery. The idea was requested by Mr. Gyashuddin. Recharging Cellphone Battery with Laptop Battery hello sir my self md gyashuddin I want to know that it is passible to built a circuit which can ,recharge my cell […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Cellphone, Charging, Laptop

Self Optimizing Solar Battery Charger Circuit

Last Updated on May 17, 2026 by Swagatam 261 Comments

solarmpptchargercircuit

In this post I have explained a simple IC 555 based self optimizing solar battery charger circuit with buck converter circuit that automatically sets and adjusts the charging voltage in response to the fading sunlight conditions, and tries to maintain an optimal charging power for the battery, regardless of the sun ray intensities. Using a […]

Filed Under: Battery Charger Circuits, Solar Controller Circuits Tagged With: Battery, Charger, Optimizing, Self, Solar

Lithium Polymer (Lipo) Battery Charger Circuit

Last Updated on May 17, 2026 by Swagatam 73 Comments

24vbatterychargercircuit

In this post I have explained a simple lithium polymer (Lipo )battery with over charge cut off feature. The idea was requested by Mr. Arun Prashan. Charging  a Single Lipo Cell with CC and CV I came across your work on “​Bicycle Dynamo Battery Charger Circuit” in Homemade circuit design blog. It was really informative. I […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Lipo, Lithium, Polymer

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