Category Archives: Electronic

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.