Dad and I built a variety of Heathkit and EICO stuff way back when, from oscilloscopes to signal generators to whatever.

I LOVED these kits. I could only afford a handful but I would order manuals and build many in my mind.

Later on, I built countless S-100 computer cards when I had a paying job, and that led to other jobs. I never took a course in electronics and computers.

A far cry from Arduino and RaspberryPI, but interfaces get you (often) into that "old" world of discrete analog parts and sensors.

Ah, nostalgia. I'd drool over the Heathkit catalogs as a kid. I still have a Van Alstine-modified Dynaco PAT 5 preamp with walnut case that's been the heart of my audio system for almost 40 years. Absolutely trouble free all these years and still sounds great.

Elenco is still around. I just bought a XP-720K linear power supply kit last week.