Category Archives: Uncategorized

Hello everybody! I will shut down this site soon as all content has been moved to https://www.walduk.at

TL;DR: Don’t use it in portable things as it cracks My laptop has become loud and slow over the years. This came from permanent 90°C CPU temperature and thermal throttling. From my experience, the manufacturer never uses the correct of … Continue reading →

TL;DR: Use magnets to connect batteries Most Batteries contain Iron or Nickel. Just use a magnet to  connect the battery. On the other side you can use one of those cheap copper-clad cables from china or alligator clips Bonus: The … Continue reading →

TL;DR: I’ve invested way too much time and money in this thing Introduction I’ve printed for over a month now. Various things broke and some improvements weren’t improvements after all.   New bed surface I’ve tried a lot. The best … Continue reading →

TL;DR: You have a lot of work to do until this is usable Introduction I’ve bought an Anet A8 für 143€, everything included. It’s a clone of the the Prusa i3 and available under all kinds of brandings and with … Continue reading →

TL;DR: Always take into account the ground bounce. Introduction I’m developing a software controlled Switched Mode Power Supply (SMPS). For this I need to measure current at ~250kHz. This is a recollection of the false assumptions and mistakes I made. … Continue reading →

TL;DR: Cheap powerbanks are overrated I’ve bought a few powerbanks like this one: These are the common problems: 1. Outdated and underrated SMPS These power banks have to convert the battery’s voltage from 3.0V – 4.2V to the USB’s 5V. … Continue reading →

TLDR: I cut my blades using a chainsaw This happened a year ago. I never posted it because i “wanted to do it right and give good documentation”. But i think some pictures are better than nothing. Theory My goal … Continue reading →

TLDR: Set the waterpump’s power over wifi I’m using a Siemens Micromaster Vector to continuously drive a waterpump. This way, i can change the frequency and with this the power usage. Unfortunately, the inverter is placed in a wet hole … Continue reading →