EBOOT Mini MP1584EN DC-DC Buck Converter Adjustable Power Module 24V to 12V 9V 5V 3V(6 Pack)

Excellent adjustable buck style voltage regulators.. don't get hot, provide a soild voltage feed with raises and falls that stay within 1 to 2 hundredths a volt.. give a fairly clean output voltage (still need a LC filter if you want very clean wave forms) provides 0.6 to 23 volts from my testing.. able to pull a constant 3.5 amps off it at 16.8v without it getting hot 2.5amps at 20volts gets warm but ok... 3amps at 20v will cook the coil in about 20 minutes.. at 12v I was able to pull a solid 4.2a off it for 2 hours and the temp never got above 97F, 4.5a at 12v smoked it in 7 minutes... If you cook the coil on it it does NOT allow full voltage to pass through (I have had some buck regs fail and allow full voltage to pass through for a few seconds.. I killed two of these intentionally to make sure that when it failed no voltage pass through and on neither one did that happen and that makes me VERY HAPPY. A failure acts like a breaker, it fails it fails and circuit is instantly broken.. I tested this with a O-scope and it had 0ms of full voltage seep when it failed..) These are incredibly cheap and excellent quality.. over preform and stay dang steady.. These are without a doubt the best cost to preformance ratio bucks you can buy... Bucks are not a place to skimp and buy as cheap as possible BECAUSE a failure on a buck that is supplying constant regulated voltage to high dollar electronics and fail and allow unregulated voltage to seep by for even a 1ms can damage sensitive to voltage electronics and ruin your day and make you wish you wouldn't have saved that 30 cents per piece.

I used this to reduce the speed of a 24V fan, making it nearly silent. I snipped the fan wires and soldered them onto this board, then taped it down. Turned on the fan and adjusted the screw until it was the right balance of airflow and noise. Overall, works really well and price is great.

These may work really well for larger drops (12V to 3V?) but for my use of 5V to 3V the potentiometer is just way, way too finicky and nearly impossible to adjust with accuracy. The tiniest bump or turn and the output V can swing from 1V to 4V. I really wanted to like these little guys because the larger adjustables are just a bit too big for my use and these are a dream in terms of form factor and performance, but my use case is not sitting still in a box untouched or unbumped, and the little potentiometer screw here is just not solid and discrete enough for the low drop use case I needed them for. I'll be looking at other projects with a bigger drop to give them a better try in future.

I haven't tested much beyond setting the voltage and forgetting it. I used it to create in all-in-one module for adding bluetooth to an older car stereo and it also powers a wireless charger. It has been stable and consistent for over a month now. I have read other reviews of input voltages exceeding the rating of the filter capacitor, so it's something to be wary of, but unfortunately there is no way to check the voltage rating of it so I cannot vouch for that. Love it overall, great package size, efficient and a wonderful value. Good to have in the bin for later projects.

It worked great when I tested one of them. So I permanently glued it to my setup. And now the potentiometer is not changing the voltage on 3 of them. I am pretty sure I didn’t turn it too far but who knows maybe I applied too much force. So just be gentle I guess. Giving it 1 star because the product was great when it worked. But didn’t even last a few seconds of adjustments. EDIT: I changed my mind. They are working really good now. Yeah the potentiometer can be finicky but it works. By trial and error you can get the right voltage. Just be careful to go really slow and gentle while changing voltage. Don’t push down too hard and turn slowly.

Device oscillated when turned on with 2 to 5 volt output swings at 1 kHz. Set pot to middle (which was likely the original setting) and same. Soldered in another and it was the same. Watched output while turning the pot and device works great when pot is set for output below 4.5 volts with 5 volt input. Pot at middle is outside the working range for 5 volt input. Hope this saves others some time and frustration.

This is an example of "if it sounds too good to be true, it is". I have several other buck converters - they work great. For a project I needed smaller units to provide at least 5V/1A - I would like to to be able to handle 2Amps. This looked like a good option - small and "agile". As others have written - it's HARD to adjust. I had to use special screw drivers to make adjustments (ceramic) - I destroyed the first unit I tried to use. Even a tine adjustment makes a "huge" difference and getting to the exact right voltage is hard. WORSE - the moment I put a load on the output, the voltage dropped a few decimal points. So I had to start all over again. I was never able to get "exactly" 5.1v as I wanted - it jumped between 5.12 and 5.0x. Worse, touching the potentiometer also resulted in changes. So expect to spend quite a while doing this. I'm beginning to think just adding a zener for voltage regulation post this unit is much better and more precise. It's for this reason alone I'm keeping them. This unit goes bonkers when the input amp hits around 1amp. I had a 1.1amp using a simple load resister on the unit, with a 12V input. Initially I managed to get that working, and it ran for a few minutes very steady according to my scope. I then wanted to up the amperage use and that's when things went bad. Once I put a load higher than the 1.1Amp the unit keeps turning on/off. Worse, even at 12V it wanted 1.5A on the input to just drive this - while it kept switching on/off. My current limit initially made me think my 5 minute test had destroyed it. It just keeps turning on/off when there's a substantial load. So for my project this will not work. If you need less than 1Amp on the output this looks like a great solution vs. a regulator that gets very hot around 0.5A (at least if you use the good old 7805). It's a great alternative that works once you've dialed the unit in. Do consider a zener for more precise regulation - set the output a bit high so it will be right under load. I compared the units temperature during the 5 minute test run with a 7805 - the 7805 maxed out at around 150C - when I turned it off. This unit never got higher than 45C - much better from an efficiency perspective. So it's too cheap to really be useful. But for a quick prototype where you don't have a cheap transformer with steady voltage, this will definitely do.

I’m an Escape Room owner and have used these many times to reduce 12vdc voltage to 9v, 6v, 4.5v to power different escape room technical props/puzzles. I’ve also used to replace battery operated Halloween props like blow mold pumpkins using a 12v power supply and knocking down the voltage to replace the need for batteries. Cat5 wire or speaker wire works well, in a pinch, to accomplish this. As others have mentioned, adjusting voltage is a bit tedious and requires a small (tiny) screwdriver and it is somewhat hard to dial in, but it works with a little patience. Make sure your input power and polarity is correct or you will fire the circuit board. I tend to use a large heat shrink tube to enclose/protect the circuit board after hooking things up.

I got these to power a raspberry pi on my 3d printer. it was really simple to set it to 5.3v out on 24v in and it gets warm but not to a concerning level. voltage seems steady. Seems to be working great! cant wait to use the other 5 somewhere

As described. Works perfectly.

It had the right pin pitch for a breadboard and the pot could be adjusted to get the right output voltage.

This device is small and adjustable to any voltage within the range specified, not just the discrete voltages listed. ie you don't select a voltage from a finite set of choices, you adjust it to anything you want in the range. Once set, it doesn't matter what the input voltage is, so long as it's within the specified range. At 3A rated output, it's perfect for mobile application payloads (eg. on drones), instrumentation platforms, and so on to name a few. At the low cost these devices sell for, I'm going to buy another batch just to have them around for those last minute projects that need a great stable power supply.

I used this buck converter to convert a set of solar LED string lights to run off the 12v battery in my tent camper. I simply connected it to a spare 12v battery on my bench to set the output to 3.5v before shrink-wraping and installing it by splicing into the existing exterior light circuit on the trailer. I was concerned that a higher input voltage while charging the trailer battery may effect the output voltage but it does not. Steady 3.5v regardless of input voltage. I will report back on dependability and heat generation after I've run them for an extended time in a few weeks.