TSP #202 – A Uniquely Complicated Nixie Tube Clock: HP 5245L Electronic Counter & ERA EasySynth++

In this episode Shahriar repairs and analyzes two instruments. An HP 5245L Electronic Counter which uses 1960’s technology to achieve some incredible performance. The HP unit uses eight beautiful nixie tubes as its main numeric display. The instrument requires repair, calibration and some upgrades to prepare it for use as a nixie tube clock! The source of the clock is an ERA Instruments EasySynth++ which is a high performance, open-source synthesizer up to 20GHz:


The architecture and teardown of the EasySynth++ is also presented. The two instruments are combined with some custom scripts to create the world’s (?) most complicated nixie tube clock.

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