18650 batteries are known for it's high energy density, but this comes at a price. In order to protect the battery from overcharging or overdischarging a number of ICs need to be used. Luckily these charge and protector circuit boards are readily available for sale in all shapes and sizes. In this blog post I am going to build a charger that uses such a circuit.
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As doctor Emmett Brown "Doc" in the movie Back To The Future stated: "Marty, I'm sorry, but the only power source capable of generating 1.21 gigawatts of electricity is a bolt of lightning". Fortunately we will not need as much power for our arcade cabinet and a 12 Volt, 2.1 Ampere power supply will be more than enough.
The most important part of a computer architecture is a clock circuit. The circuit described here has the option to run freely in a-stable mode and also operate in single step debugging mode. In this post I will describe how to implement this design in KiCad and manufacture a double sided printed circuit board.
There is something about blinking leds. Numerous projects are created with the 555 timer chip. To continue the tradition I will describe in detail the creation of a 555 astable timer board that was designed in the previous blog post.
KiCad is a great schematic and PCB design tool. It is easy to learn and fun to use, above all it is free. In this blog post we are going to design a simple circuit based on the 555-timer chip in astable mode.
After the dry film is applied to the copper layer, it can be etched. There is an option to use ferric chloride (FeCl3), but it can not be reutilised and needs to be disposed. An alternative is to work with a mixture of hydrochloric acid (HCl) and hydrogen peroxide (H2O2), which can be regenerated with air and reused for the etching process.