Products > Test Equipment
Benchtop Variable AC Power Supply Recommendation?
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BillyO:
There is no $50 solution to your situation.  The lowest cost solution is an isolation transformer plus a Variac. As far as I can see that would cost you about $500 for a small few watts for the cheapest possible solution.  If that is too much, then maybe you could find another pursuit/project?

Some things are not "cheap".   
LinuxHata:
If not mistaken, Linear (or TI), have a quite juicy opamp, with up to 1A of output current, up to 25V. (it was available in TO-220 case even, just I don't remember the P/N) Very few external components would be required to build adjustable voltage/current PSU with that way.
LinuxHata:
Here it is - LT1970A

https://www.analog.com/media/en/technical-documentation/data-sheets/1970afc.pdf
inse:
A cheap solution, but not quite reaching the 30V might be a adjustable model railroad transformer.
Isolated secondary, short circuit protected…
J-R:
The best budget solution with minimal DIY seems like a variac plus a step-down transformer and some resettable fuses as desired.  I do not see this being very big or heavy (and why does that matter since it's going on a bench anyway?), and the output should have no issues reaching 30V/1A (or even 100W+).  Neighborhood of $100 USD.  Maybe a little more if you want to put all the parts in a nice enclosure.

A signal generator + audio amp is for sure legitimate, you can get one of the toy sig gen kits and rescue a car amp for maximum savings.

And to clarify, I have had both of these solutions for quite some time, no issues assuming you keep children away.
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