5Pcs MP1584EN ultra Small DC-DC 3A power Step-Down Adjustable Module Buck Converter 24V To 12v 9V 5V 3V for Arduino

Worked great when upgrading the fans on my Ender 3 V2. Take time to dial in the required voltage correctly. Twin output is useful if running more than one fan off the Buck or in my case sending the 12v output off to a Micro USB buck to power a Raspberry Pi. It states an input voltage of 23v but working fine with the 24v input on my printer. All 5 working great, no duds.

Used one of these to reduce voltage from 24 volts to 12 volts on my 3d printer to run a different fan. Works well. It was also possible to find a 3d printed case on a well known website for stl files which worked perfectly. Good value for money.

Does the job. Needed to step down 12v to 5v for an ESP32 project I was making. The pot on the first one "broke" -- or at least couldn't be set accurately. This could have been me winding it too far one way, but I don't think I put too much force on i.e. The second one was fine through the development and I wasn't particularly gently -- I'm sure it fell of the desk once or twice too! This one stayed the voltage, but I added some hot glue during final assembly of my project to be sure. I've not tested the remaining 3 boards.

Excellent device. Easy to setup!!

I prefer fixed-voltage buck converters usually as most of the adjustable ones have terrible potentiometers. Unfortunately this one is no exception. It has two problems: firstly adjusting it even a little too far in either direction causes the screw to pop loose and lose its resistance, and secondly the response appears to be nonlinear, so at the bottom end of the scale the difference between 3.5V and 0.5V is approximately 1/8th turn. I was unable to get it to reliably output 3.0V due to this, so I ended up desoldering the potentiometer and soldering a fixed resistor between Vout+ and the FB divider. It loses a bonus star for the MP1584EN being silk screened and position marked upside down, confusing measurements further (hope they got them at a discount!). If you want to convert it to a fixed buck like mine - then by my measurements using some calibration pair values, the equation to determine the fixed resistor to replace the potentiometer with on MP1584EN based converters is: Rtop = Rbot*((Vout/Vfb) - 1) When you substitute with calibration values I have measured in practice, this becomes: Rtop in kOhm = 8.2*((Vout/0.952) - 1) All you have to do here is plug in your desired voltage value into Vout. So for 3V for example this becomes: 8.2*((3/0.952)-1) = 17.7kOhm In my case 18kOhm produced 3.041V which is bang on so this appears to work. You need to solder the resistor diagonally between Vout+ and FB (as you are facing the board from Vin it is the bottom left pad, not the bottom right). 1206 is the ideal size for this but 0805 will just about reach too. Have fun!

I am using this as a fan speed controller because with other PWM controllers, the fan is still noisy and additionally there is a high-pitch humming. But not with this! Now it is silent like the snowfall and absolutely worth it!

2/5 of my boards went up in smoke when adjusting above 10V on my bench PSU. The 3 that worked work very well, and are now running 12V fans on my 24V 3D printer.

Small board but not good with RF. I used this to reduce a 12v to 6v for power a small RF amplifier. Had to take it off as it was causing very erratic noise on the system and when output voltage was tested it was fluctuating up by .4 of a volt then back down again.

3 of the 5 worked as intended but 2 did not work, just the same voltade at the in as at the out.

Moduł step down działa bez zarzutu zgodnie z opisem. Trzeba jedynie uważać przy regulacji napięcia wyjściowego, bo śruba regulująca jest bardzo czuła. Generalnie polecam produkt

Das Modul wird zusammen mit 4S LiIon (18650) als netzunabhängige Alternative zu einem 9V max. 2A Netzteil eingesetzt und funktioniert in dieser Anwendung problemlos. Wegen der Topologie mit Freilaufdiode braucht man keine Wirkungsgrad-Wunder erwarten, aber die Verlustleistung hält sich in Grenzen. Bei 15V Eingangsspannung und einem Ausgangsstrom von 1,48A (bei 9V Ausgangsspannung) fließt ein Eingangsstrom von 0,96A. Damit ergibt sich bei diesem Arbeitspunkt ein passabler Wirkungsgrad von 13,3W/14,3W = 0,93. Dieses eine Watt Verlustleistung heizt dem Modul schon merklich ein: die Gehäusetemperatur des MP1584 beträt dabei ca. 69°C, auch die Speicherdrossel wird gut warm. Als Schaltfrequenz waren ca. 900kHz zu messen. Vss der Schaltstörungen ca. 20mV. Ja, die Einstellung der Ausgangsspannung erfordert ziemlich Fingerspitzengefühl, aber i.d.R wird die nur 1x eingstellt und bleibt dann so. Bei einem Preis von etwa 1,40€ pro Modul geht das alles in Ordnung.

Blows up ol the time

Werkt perfect.