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

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.

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 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.

Work like a charm. I used them to rewire Christmas village lights. Damn department 47.

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.