QR decomposition using Givens rotations
7 mins
Mini recipe and hopefully descriptive summary on how to perform QR decomposition using Givens rotations which forms the basis of many linear algebra numeric applications such as least squares, GMRES, etc.
Gold plating on copper surfaces
8 mins
A summary on a procedure on how to use a galvanic process to plate copper (and other metallic surfaces) with gold using a galvanic bath
Rendering static two dimensional electric fields caused by point charges using Python
8 mins
A mini summary on how one can use Python and matplotlib to calculate and render two dimensional static electric fields generated by point charges in infinitly sized space based on Coulombs law and the superposition principle.
The capstan equation
3 mins
A summary on how to derive the capstan equation describing the friction of a rope on a bollard, winch or a capstan
Recipe how to recover Jenkins plain secret text credential via the web user interface
1 min
This short recipe explains how one can recover a Jenkins secret text credential directly using only the web interface
A short story of the migration process for The-Things-Network v2 to v3
8 mins
This article is a mini summary of the steps that have been required to migrate from the v2 to the v3 stack of the things network, a community driven LoRA-WAN backend solution.
Writing daemons in python
4 mins
Mini (really short) summary of one way as well as a recipe on how to write daemons in python
Building a simple 6 kV DC power supply
9 mins
Short summary on how to build a small 6 kV power supply using an 2.1 kV microwave oven transformer, two of the accompanying capacitors and a bunch of diodes that is capable of delivering a little bit more than half a kilowatt of power
A simple OpAmp photodiode readout circuit
15 mins
A short summary on the workings of photodiodes, how one can interface them to simple electronics and a simple amplifier circuit
Controlling Pfeiffer Turbopumps using RS485
25 mins
Pfeiffer makes great turbopumps but sometimes you want to log information or control them from an existing control system. Out of this desire I played around with the RS485 protocol used by Pfeiffer and wrote some simple unofficial tools - that's what this blog entry is about
