In this article I want to explain how I make PCBs for my projects.
As you can see on my articles and YouTube channel, if I build something, I always want to have the best result. Before I started to order my PCBs at a PCB Manufacturer, I etched my PCBs myself and I used many different PCB making techniques. From the toner transfer to photo positive layer technique.
At some point I was intrigued to try to order PCBs for my prototypes from a PCB Manufacturer and hoping that they look better. After researching in internet, I stumbled upon a company named JLCPCB. Here is the link: https://jlcpcb.com/DDE. We can order up to 4-layer PCBs for as low as $2 and they also offer free-SMT-assembly for us.
So I ordered small quantity PCBs and after around 2 weeks the arrived. I was surprised to see the quality of the product. They are awesome!
To draw the PCBs I use PCB designer software KiCAD. KiCAD is an open-source circuit and PCB designing software. You can export your project on KiCAD and upload the files to JLCPCB website to order your PCB. Here is the link to the KiCAD website: https://www.kicad.org/
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:
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:
After the prototype was successfully built, I ordered the PCB from jlcpcb.com. Also Kaizen Technology offers services like Surface Mount Assembly, Prototype PCB Assembly, and Fast turn PCB Assembly.
Here is how it looks like:
That was the story of my ignition coil interrupter.
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:
Here is the capacitor that I use (AC capacitor must be used):
This is my schematic:
The 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:
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.