DROK Adjustable Voltage Regulator DC, Buck Boost Converter 6.0V-36V 9v 12v to DC 0.6-36V 24v 5A Power Supply Panel, Constant Current Volt Step Up Down Module

This does everything I expected and more. Highly recommended.

First, the value for the money is exceptional.Twenty-something bucks for a power supply that can boost/drop voltage to anywhere from less than a volt to over 30 volts it so cheap that I am fine with buying extras and just leaving them in my projects rather than bothering with building custom voltage/current regulation hardware to swap out for it when I'm done prototyping.There is an active cooling fan for when loads demand it, but I've yet to drive it hard enough to trigger it and if you don't want to use their little fan, you can unplug it and take responsibility for the job of keeping the chip cool.The enclosing plastic frame doesn't seem to be too inefficient about leaving empty space inside to make the case a useful shape, and it sufficiently protects the hardware against my careless slinging of conductors near it, as well as the occasional drop onto hardwood floors.The screw-down terminals for connecting source and output wires are excellent. They are physically secure and won't wiggle against their solder just because you are tightening the screws securely plus they accept nice, large-gauge wire (I'm pretty sure all the wires I have in there are a 12 gauge or thicker). They are all right in a row, though, so be sure you tin the ends and cut them to have no exposed wire visible outside the terminals or a stray strand of wire could short something.Speaking of safety, you can manually adjust the live current/voltage settings in use (with a delay) but switching modes automatically turns off the output to protect against accidental frying of hardware. It might be annoying, but without it on my previous voltage converter, I burned up a whole LED array by accident.However, the user interface is barely acceptable, with numerous quirks:Current limiting is always on, but the "CC" (constant current) indicator only signals when the current drawn exceeds the setting and the power supply is holding it down to the set value.Setting values is done digit by digit with the knob, but sometimes the largest digit is only set by adjusting the second largest by enough to carry over.Many settings are unexplained and most require good acronym guesswork to decode.The memory can have 9 saved presets, but only the 1 and 2 numbered presets are able to be quickly recalled with the power button.Making changes is a process that usually forces me to cycle through setting digits at least twice before the value is what I want, and changing the live voltage or current limits has a two second delay before being applied, making the process of zeroing in on an optimal voltage by trial and error much slower than necessary and leaves accidentally-too-high voltages pumping through your hardware for two seconds (more than enough time to damage LEDs with even moderate excess voltages.Overall, the quirks I am happy to put up with in exchange for the many strengths and excellent price for this very useful module.

I bought this unit as an upgrade from a cheaper 4amp unit that did not work as I had hoped. So far, this unit is everything I had hoped it would be, and more.-----------------Pros:On-off button controls the output, not the display. This is absolutely a plus, because it means that one can adjust the desired voltage and current settings before turning on power to the output. (One can also adjust settings while the output it on, but this switch adds flexibility.)Bright, color display shows a wealth of information in a single screen.Built-in fan to keep components cool.Easy to mount the unit - just cut (or 3d print) a rectangular opening of approximately 75 x 39mm and pop it in---------------Cons:The interface is a bit complicated / tedious, though it gets easier to navigate with practice. Other than the on/off button mentioned above, all input is handled through a single rotary/push-button knob.The included manual (and the one available on-line) does not entirely match the unit, especially for the last "preferences" screen - the unit I received seems to have more options than what the manual shows, and I have not figured out what some of them are.This unit is bulkier than the 4-amp unit I started with; with the latter, I was able to build my DIY bench power supply entirely within the case of a surplus PC power supply. To accommodate this unit, I had to create a 3d printed "extension" to the case to allow more room.-----------------The pros far outweigh the cons, at least for my purposes. I have not had the unit long enough to know if it will remain reliable over time, but so far it has given me exactly what I had hoped for in a cheap DIY bench power supply.