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The “DPS” series of power supplies from the Chinese manufacturer Ruideng is popular among hobbyists. It allows to set voltage and current, but still needs a source power supply – so basically it’s a DC buck converter. It also doesn’t come with a case. I built three cases, using some scraps of plywood. Two cases…
To power an LED, the current that flows through it needs to be limited. For simple LEDs like the ones for signalling purposes, the cheapest and easiest way is to use a resistor in series with the LED, to limit the current. The question that normally remains is: Which value should the resistor have?
Like for the Lavolta power supply, I wanted to build a simple fan-controller circuit. Actually, I built this one first, and unlike the other one, which used the ATtiny85, I decided to build this one with a ATtiny13a. Because of this, the library for the DS18b20 digital sensor was too big to fit into the…
The Lavolta BPS305 is a cheap bench power supply of Chinese origin. The device comes with a 24 V DC fan, but without any means to control it in any way. The fan will just run the whole time, which is pretty annoying. Because of that, I decided very build a fan-controller using a microcontroller…
A few years ago, I decided to build a case for the Raspberry Pi out of oak wood. Since I wanted to power the Pi from a 12 V source, I included a switch mode voltage regulator. Here are some pictures of the project. 🙂
This article describes, how to use OpenSSL to create a self-signed certificate authority and sign certificates with it.
avr-libc is the standard library for AVR micro-controllers. It already contains many functions and header files that are optimised for the target platform.
Some time ago, I decided to build simple but decent LED stripes, to put them under my PC’s displays and illuminate the keyboard and the working space directly beneath. I used 5 V LED strips, since plugging the light into a free USB port, seemed to the be easiest way to power the light.
If you solder a lot, you probably own at least one pair of so called “helping hands”. In my experience the ones you get nowadays are less heavy (smaller and therefore lighter foot) and all in all cheaper, than the ones you could buy one or two decades ago. Unfortunately I couldn’t find better ones,…
There are different versions of stands/holders/dispensers for holding the reels of solder and allow yourself to conveniently unwind them, as needed. Most of them are made of metal and can handle multiple reels. I decided to build some myself using wood, plywood and small brass tubing, I already had laying around.
