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6 Useful DC Cell phone Charger Circuits Explained

Last Updated on December 26, 2020 by Swagatam 299 Comments

DCcellphonechargercircuit

A DC cell phone or mobile phone charger is a device which charges a cellphone from an available DC supply source. The device converts the unregulated DC source into a constant current and constant voltage output which becomes safe for any mobile phone charging. In this article I have explained how to build DC to […]

Filed Under: Battery Charger Circuits Tagged With: Cell, Charger, Circuits, DC, Phone, Useful

How to Design Your Own Inverter Transformer

Last Updated on December 10, 2024 by Swagatam 420 Comments

transformer inverter

Designing an inverter transformer can be a complex affair. However, using the various formulas and by taking the help of one practical example shown here, the operations involved finally become very easy. The present article explains through a practical example the process of applying the various formulas for making an inverter transformer.The various formulas required […]

Filed Under: Inverter Circuits Tagged With: Design, Inverter, Transformer

12V Battery Charger Circuits [using LM317, LM338, L200, Transistors]

Last Updated on January 18, 2025 by Swagatam 196 Comments

317CIRCUIT

In this article I will be discussing a list of simple 12V battery charger circuits which are very easy and cheap by its design yet extremely accurate with its output voltage and current specs. All the designs presented here are current controlled meaning their outputs will never go beyond a predetermined fixed current level. UPDATE: […]

Filed Under: Battery Charger Circuits Tagged With: 12V, Battery, Charger, Circuits, LM317, LM338

Simple Hobby Circuit Projects

Last Updated on August 6, 2024 by Swagatam 196 Comments

40 Watt Fluorescent Lamp Inverter Circuit Diagram2C Image

A few of the interesting and useful hobby electronic circuit diagrams already published in this blog have been selected and compiled here for your quick reference and understanding. What is a Hobby Circuit? A hobby circuit is an electronic circuit project specially designed to suit new hobbyists. These circuits are mostly small and easy to […]

Filed Under: Mini Projects Tagged With: Hobby, Projects, Simple

Build Simple Transistor Circuits

Last Updated on January 2, 2024 by Swagatam 67 Comments

variable power supply transistor

A compilation of important assorted transistor simple circuits to build has been included here. Simple Transistor Circuits for New Hobbyists Many simple transistor configurations like, rain alarm, delay timer, set reset latch, crystal tester, light sensitive switch and many more have been discussed in this article. In this compilation of simple transistor circuits (schematics) you […]

Filed Under: Mini Projects Tagged With: Build, Circuits, Simple, Transistor

IC 555 LED Circuits (Blinking, Flashing, Fading Effect)

Last Updated on November 15, 2023 by Swagatam 171 Comments

f149dbce8308cab5de03978b6d8380ec6ee022f8 orig

In this post I have explained how to assemble IC 555 for generating interesting LED circuits with blinking, flashing and fading light effects with some minor modification and enhancements. Why use an IC 555 Astable The astable multivibrator mode is the most fundamental mode of operation of the IC 555. In this mode it basically […]

Filed Under: Mini Projects Tagged With: 555, Blinking, Circuits, Fading, Flashing, LED

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