GPIB Interface for PM3365A Oscilloscope

2017-11-05 by rincewind

The Philips PM3365A oscilloscope I inherited last year works fine – but it has one drawback: the only way to export data is via a GPIB interface. I had the opportunity to borrow a Prologix GPIB interface to test what can be done with this interface – it turns out remote control of the oscilloscope[…] Read More…

Medium-Speed Isolated Power Switch

2017-09-17 by rincewind

The isolated power switch presented here was built to do repeated power-up/power-down tests on a power supply. I basically needed a MOSFET that could be controlled by a PC. To keep the circuit universal, the following design goals were added: Isolation of the switched circuit from the PC, so the switch can be used in[…] Read More…

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…

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…