Taming the buck with a Type III compensator

This is the story of a commercially unavailable stereo pair of the bi-amped Marshall Uxbridge, with custom-built replacement electronics: active filters feeding two linear power amps. Listening to this high-fidelity set has brought me immense enjoyment. Play a great album on these near-fields, and the result is close to pure magic! Over and above the accurate reproduction of a wide audio range, the precision and depth of its stereo imaging is stunning.

What is the logical next step after making a linear regulator? I learned some valuable lessons (both regarding general electronics and power supplies) doing that project, so I believe I could now make a much better linear supply. And perhaps I will! But now I decided it was time to aim for a switch-mode power supply (SMPS), a.k.a DC/DC converter.

The first 15 years or so in the life of this lamp were spent as originally intended: as a TOOLCRAFT magnifying lamp (model 8066/EU), sporting a 22W G10q circular fluorescent bulb. It ran trouble-free for several thousand hours, allowing me to look at small stuff through its large (⌀12 cm) magnifier glass, and serving as a desk and ambient light....

My brand new PSU, the most complicated circuit I designed and built just recently, started life in October 2023. It seemed to work pretty well, at least I got through the long and dark winter with it feeding my LED Superlamp. (Most of the time. The rest of that time, I was using it for something it was actually intended for, i.e., the feeding of...

So what to do with all the newly acquired experience of creating finely detailed circuit boards, SMT and all?