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Automobile Electronics

CDI Tester Circuit for Automobiles

Last Updated on October 30, 2025 by Swagatam 47 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 341 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

Modifying Car Turn Signal Lights, Park-Lights and Side-Marker Lights

Last Updated on April 16, 2025 by Swagatam 53 Comments

modified park lights

In this post I have explained an innovative circuit modification which allows a single common lamp to be used as a parking light, turn signal indicator light, as well as a side marker light on the relevant positions. The idea was requested by Mr. Chris Technical Specifications I have a project that is slightly related […]

Filed Under: Automobile Electronics Tagged With: Lights, Modifying, Park, Side, Signal, Turn

Car Reverse Horn Circuit

Last Updated on February 26, 2025 by Swagatam 2 Comments

reverse horn PCB track

A crucial safety element in cars is the reverse horn, sometimes referred to as the reverse warning device or backup alarm, which emits an auditory signal while the automobile is in reverse. The reverse horn, which is intended to improve pedestrian and occupant safety, generates a unique sound to alert others around that the vehicle […]

Filed Under: Automobile Electronics Tagged With: Horn, Reverse

4 Solid-State Car Alternator Regulator Circuits Explored

Last Updated on February 26, 2025 by Swagatam 85 Comments

car voltage regulator circuit

The 4 simple car voltage current regulator circuits I have explained below is created as a immediate alternative to any standard regulator and, although developed principally for a dynamo it will function equally effectively with an alternator. If the functioning of a traditional car alternator voltage regulator is analyzed, we find it amazing that these […]

Filed Under: Automobile Electronics Tagged With: Alternator, Circuits, Explored, Regulator, Solid, State

3 Interesting DRL (Day Time Running Light) Circuits for Your Car

Last Updated on February 23, 2025 by Swagatam 113 Comments

DRL 2

DRL or Day Time Running Lights are a chain of bright lights mostly LEDs installed just under a vehicle’s headlight, which illuminate automatically during day time to ensure that others can distinctly notice the vehicle approaching even from a distance. The following customized DRL circuit was requested by Mr. Jivesh Technical Specification as Provided by […]

Filed Under: Automobile Electronics Tagged With: Circuits, DRL, Interesting, Light, Running, Time

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