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Newly Updated Circuit Projects:

CDI Tester Circuit for Automobiles

Last Updated on October 30, 2025 by Swagatam 49 Comments

SparkGap

The first design below shows a simple workbench setup for testing all types CDI circuits. It uses a capacitive discharge ignition circuit along with a CDI coil to implement the testing procedure. Audio/Video Representation The circuit does not require any separate oscillator, rather the 100Hz from the bridge rectifier itself works like a pulsed trigger […]

Filed Under: Automobile Electronics Tagged With: Automobiles, CDI, Tester

Simple Capacitive Discharge Ignition (CDI) Circuit

Last Updated on October 28, 2025 by Swagatam 342 Comments

cdi

In this post I have explained the circuit for a simple, universal capacitive discharge ignition circuit or a CDI circuit using a standard ignition coil and a solid state SCR based circuit. For an audio/video explanation, you can watch the following video representation: How Ignition System in Vehicles Work The ignition process in any vehicle […]

Filed Under: Automobile Electronics Tagged With: Capacitive, CDI, Discharge, Ignition, Simple

High Current Li-Ion Battery Charger Circuit

Last Updated on October 23, 2025 by Swagatam 203 Comments

universalli ionchargercircuit

In this post I have explained a high current Li-Ion battery charger circuit which can be used for charging any high current, such as 2S3P, 3S2P battery packs. It can be also used for charging other similar high Ah rated Li-ion battery from a car or a truck battery. The idea was requested by Mr. […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Current, High

How a Relay Works – How to Connect N/O, N/C Pins

Last Updated on October 16, 2025 by Swagatam 82 Comments

how to connect a 6 pin relay

An electrical relay consists of a electromagnet and a spring loaded changeover contacts. When the electromagnet is switched ON/OFF with a DC supply, the spring loaded mechanism is corresponding pulled and released by this electromagnet, enabling a changeover across the end terminals of these contacts. An external electrical load connected across these contacts are subsequently […]

Filed Under: Electronics Theory Tagged With: Connect, Pins, Relay, Works

Making a Time Machine – Concept Explored

Last Updated on October 16, 2025 by Swagatam 3 Comments

Wondering how to travel in time? Learn it with great Sir Stephen Hawking, according to whom time warp may be an option but seems pretty impractical, the reason being the feed back loop which will just oppose the feasibility of making a time machine and the concept using this theory. Are you intrigued by the […]

Filed Under: Electronics Theory Tagged With: Concept, Explored, Machine, Making, Time

3.7 V Li-Ion Battery Charger Circuit with Automatic Cut-off

Last Updated on October 14, 2025 by Swagatam 401 Comments

Li ion USB charger circuit

In this article we study a simple 3.7V li-ion battery charger circuit with auto-cut off, which can be charged from your computer USB port or any other 5 V regulated source. Simplest 3.7V Li-ion Battery Charger with Auto Cut-off using LM393 IC If you do not wish to read the following long explanation, you can […]

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

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