Category Archives: Electronic

Interrupter Circuit

Here is the interrupter circuit that I use on some of my plasma ignition videos. I also call this circuit “ignition coil igniter”. It consists of a frequency generator and two switching MOSFETs. 555 timer IC is utilized to generate pulses. The frequency can be adjusted by turning the potentiometer. This circuit can drive two ignition coils at the same time. I designed this circuit this way because I want to be able to make comparison between two ignition setups and see the result side-by-side.

Here is the schematic:

Interrupter Schematic Diagram

Before I drew the schematic, I tested various combinations on a breadboard. I use KiCAD to draw the schematic and also the PCB. On the final version I use IRF740 instead of IRF540. This type of MOSFET can handle higher voltage compare to the previous one.

Here is my home made PCB:

PCB bottom view
PCB top view

After the prototype was successfully built, I ordered the PCB from Also Kaizen Technology offers services like Surface Mount Assembly, Prototype PCB Assembly, and Fast turn PCB Assembly.

Here is how it looks like:

PCB bottom view
PCB top view

That was the story of my ignition coil interrupter.

Capacitive battery charger

Disclaimer: Electricity is dangerous. High voltage and high current can kill you! Do not try to build this circuitry if you don’t have enough knowledge in electricity. If you still want to build this circuit, do it at your own risk! I don’t take any responsibility of what you do and its consequence. This article is intended for informational purpose only.


Not long ago I built a battery charger that uses capacitor as current limiter and voltage devider. Despite of simple schematic, this circuit has very good performance. It charged my 6 Volt 235AH dead battery from ~1 Volt to over 6 Volt within 15 minutes! But the charging process is kind of scary because of the (hydrogen and oxygen) bubbles crackling sound created during the process. Do not charge a battery in a closed (non-ventilated) room. Do it outside your house.


Here is the picture with the box opened:


Here is a picture of my test circuit:

capcharger04Here is the capacitor that I use (AC capacitor must be used):

capcharger05This is my schematic:

capcharger_scm_cutThe function of the switch is to change the total capacitance value of capacitor. The higher the capacitance value, the higher the charging current, which also means faster charging rate but with more heat generation.

And here is my explanation of how this circuit works:

capcharger_expl01_scm_cutcapcharger_expl02_scm_cutAnd here is the simplified explanation:


Ignition Booster

Some time ago I built an ignition booster for gasoline engine which gives very big sparks. It uses simple components and performs better than “Crane-Cams” or “MSD”. I think this kind of booster is very promising in drag racing scene.

Here is the normal sparks from ignition coil:


Here is the beginning of sparks with ignition booster on:


Here is the big ball of plasma:


This is the installation on my car:


And here is the result of ca. 300 km driving with booster on:


Compare to a new spark plug:


Universal battery charger


This is my version of John Bedini style solid state radiant charger. This charger gives out voltage spikes of around 700 Volts from 12 Volt DC input. In spite of very simple basic circuit, it can charge any size of battery with different voltage at once.


It even splits pure tap water (without any additional electrolyte) into hydrogen and oxygen.


Here is the shape of output signal.


Here is the basic circuit schematic.


Here are some more pictures.