Secure mTLS Proxy for Homelab Services
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Blog on stuff
Blog on my personal work un/related projects.
Latest posts
Simple OpenSSL Certificate Authority
PKI CA A PKI (Public Key Infrastructure) Certificate Authority (CA) is an entity that issues digital certificates. These certificates verify the identity of individuals, organizations, or devices. The CA signs the certificates using its private key, ensuring their authenticity.
Microscope Lamp
Lightning is key in photography. I started to do extreme electronics macrophotography using a 4X microscope objective: (blog post), but the photographs had low contrast and shadows. So I created this little USB-C powered LED fixture that fits on top of the microscope objective and illuminates the scene. All files (PCB, 3D housing, BOM) are in the repository files on my GitHub. Feel free to build…
Detailed Macrophotography of PCBs
I had to create scans of a small flex PCB to capture more details than a flat scanner could give me. Of course, this task turned out harder than I imagined. I already had a good camera, but I was lacking a good macro lens. Buying one turned out to be hard because the highest magnification ratios on most macro lenses are 1:1. The better ones are, of course, pricier.
DIY copper RF shield made out of sheet metal and 3D printed stencils
Occasionally, it can be challenging to locate the ideal metal RF shielding can for your prototype. Opting for a custom solution can prove prohibitively expensive, especially when dealing with just five prototype boards or devices.
Installing KiCad 7 on Debian 12 - note on apt-pinning
The thing with Debian stable is that it is stable. But you don’t get the newest software which is sometimes required. Of course there are backports repositories but after a new Debian stable release may not include the required version. On the other hand adding sid repositories could mess up your system after an apt update. The solution for this is apt-pinning.
DIY RTG
I was lucky and came into possession of an x-ray tube for spot images. I also managed to purchase x-ray cassettes with an intensifying film that glows with visible light when excited by x-rays. Below are the first photos I managed to take and a photo of the setup.
Removing recording limit on sony a7iii camera
Below are all the necessary steps for removing the 30 min recording limit using Sony-PMCA-RE on a Sony a6a7iii camera under linux.
Installing OpenMemories on Sony a6000
Below are all the necessary steps for installing OpenMemories-Tweak on a Sony a6000 camera and linux.
Saving raw data from serial devices under linux
I often use data loggers connected through USB Virtual COM ports that output raw binary data. The typical approach would be to use putty or other terminal emulator to connect to given port and log the data to a file. But this has a major drawback, some bytes in the serial ASCII protocol are control bytes and the emulator won’t write them to the log file. This can be omitted by using stty and cat.…