I'm still a bottom 4; need a scope soon I think. I guess I DO have adjustable power supplies, but I'm the adjuster, on various pots and dimmers and with series connections.
I have a 12v, 1a power supply I built 30 years ago when I was 15, and it still works well. Love the 7812 !
My wall outlets are my best "power supplies"; nice and strong; up to 15 amps with pretty good voltage reg...
I REALLY need to update my garage "lab". Been out of electronics and building stuff for way too long.
I've always made do with what I have; I think being able to do that is many times more important than a fully stocked lab.
Mebbe I'll build my own digital scope; low frequency A->D but that'd be fine for most of my current needs.
I'm now getting an oscilloscope! A tektronix 2235. You wouldn't believe how much time an oscilloscope would've saved me in identifying a silly problem I had with my microcontroller. I suddenly realized at that point that multimeters aren't as versatile as far as my applications have developed.