Sunday, 25th January 2026
This one's a quick project to put together a power supply using a couple of tungsten-argon ('Tungar') rectifier tubes.
It's a fairly primative unregulated variable DC supply design which also doubles as a variable center-tapped AC supply but primarily it's a functional display piece for the tungar tubes.
ELECTRONICS / CIRCUIT DESIGN / TUBES
Monday, 19th January 2026
I've designed and built a (almost) semiconductor-free nixie tube clock using IN-14 nixie display tubes and MTX-90 trigger tubes.
I delve into trigger tube ring counting circuits and devise a modular circuit design to implement a 24-hour desktop clock.
Sunday, 28th February 2016
What kind of accuracy can you get from an R-2R Digital-to-Analogue converter built out of 1% tolerance through-hole resistors by measuring them with affordable test equipment? I find out.
ELECTRONICS / CIRCUIT DESIGN
Monday, 2nd February 2015
Teardown and repair/restoration of a old school 30V, 30A bench power supply.
ELECTRONICS / TEARDOWN / RESTORATION
Sunday, 18th January 2015
I investigate a number of modifications to this Class-AB amplifier to drastically improve its performance.
ELECTRONICS / TEARDOWN / AUDIO
Monday, 15th December 2014
I take a deep dive into practical discrete transistor constant current circuits, looking at methods to increase output impedance, lower temperature coefficient and burden voltage.
Friday, 21st November 2014
Experiments, unfinished projects, odds and ends that don't fit into a complete project.
Saturday, 7th December 2013
Designing and prototyping a portable, low-cost audio distortion and amplitude measuring tool.
ELECTRONICS / CIRCUIT DESIGN / SIGNAL-PROCESSING / AUDIO
Thursday, 27th June 2013
A look at how I select an incandescent bulb to stabilise a Wien Bridge Oscillator circuit and measuring distortion of the constructed circuit at audio frequencies.
unless otherwise noted
