GPIB Interface for PM3365A Oscilloscope
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
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…
RSA306 repair
Fixing the broken USB connector on a RSA306
Low-Power Joule Thief Night Light
The classic Joule-Thief circuit can be modified to work in a low-power burst mode: The base resistor R4 is increased to a value that provides just enough base current for startup. After startup, the base current is provided by C1 and transformer L1-L2. Each cycle, the B-E diode of Q1 charges C1 a bit, until[…] Read More…
A PLL-based 25MHz OCXO for the FZ7001 Frequency Counter
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…