Keithley 129 Display Repair

2016-12-27 by rincewind

The LCD on my Keithley 129 multimeter (which was the first big investment into my electronics hobby ~1982) has turned black over the years. The original LCD is a custom type with zebra-rubber contacts on one side, for which I could not find a source: The standard 3.5 digit displays are too big to fit[…] Read More…

Filament Spool Holder #1

2016-01-03 by rincewind

This was the first filament spool holder I built. It is easy to assemble, the required parts are printed quickly and it is flexible enough to acommodate a wide range of filament spool sizes/types. You need: M6 threaded rod, ca. 2* 17cm / 2* 12cm M6 washers and nuts 4* Ball bearing 6mm / 17mm[…] Read More…

My new 3D Printer

2015-11-01 by rincewind

3D printing is an interesting topic – after fiddling with a Stepcraft 3D printing head at work, I decided I needed a machine at home to learn the complete process – while milling 2D parts is easy to get into, the 3D printing process still has lots edges, especially when you limit yourself to open-source[…] Read More…

A PLL-based 25MHz OCXO for the FZ7001 Frequency Counter

2014-09-17 by rincewind

Update 2017-10-02: Added Firmware archive, see bottom of page I own an old ELV FZ7001 frequency counter: However, after I got a used LPRO-101 Rubidium Reference Clock, I noticed that the OCXO inside the FZ7001 is not very stable: even after warm up, it will drift 1-2ppm depending on time and temperature, which is quite[…] Read More…

Microscope Mods

2013-11-24 by rincewind

Modding a cheap microscope to solder small parts @Work, we have a nice professional stereo microscope – with SMD parts getting smaller every year, this is a must-have for rework and inspection of PCB prototypes. At home, I mainly use a head loupe, but for really small parts, a microscope that has enough space to[…] Read More…