1
Oliver Heaviside and the theory of transmission lines (2021)
(This is an adapted version of an article I wrote for the Dutch amateur radio magazine Electron , November 2021.)
Pieter-Tjerk de Boer
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2
Quartz crystals
(This is an adapted version of part of an article I wrote for the Dutch amateur radio magazine Electron , August 2016.)
3
Nixie-clock using neon lamps as logic (2017)
The above shows my home-built digital clock. It uses Nixie-tubes for readout. In contrast to most other nixie-clocks being built these days, my clock does not use any transistor or IC for driving the tubes. Instead, the driving logic is built from neon lamps , together with resistors, capacitors and silicon diodes.