#24 it was my fault for being cheap. (4.5 stars Amazon Adjustable Power supply - Jesverty 60V 5A)

This is a quick overview of the Jesverty SPS-6005N bench top adjustable power supply 0-60V 0-5A. - The “fine” knob adjusts 10mV at a time. - The “coarse” knob adjusts 5V for every degree of rotation. - The noise is around 100-120mV (regardless of the output voltage) - There is a massive capacitor across the output terminals, which is why the voltage barely moves when you lower it or turn it off. It's a usable power supply if you are desperate, but don't spend your money on this, there are better options.