HiLetgo 10pcs LM317 DC-DC Converter Buck Step Down Circuit Board Module Linear Regulator LM317 Adjustable Voltage Regulator Power Supply

This is not a buck regulator. It is a linear regulator. Which means it is not switching but just dissipating the excess power needed to step down the input voltage to whatever lower voltage you need for your circuit.I used one to step a battery (12v battery, but sitting at 13.5v when charging) down to a 10v source. The screwdriver adjusted potentiometer allows you to set any output voltage to within about 1.5v below the input voltage.It has a wide range of applications, but a very small aluminum heat sink. Say, for example, you want a 5v source and you’re starting with a 12v supply. For each amp of load, that little heat sink is being asked to dissipate 7 watts. It won’t do that for long!You might be able to use it for applications where it has to dissipate one watt, but not much more. You are going to have to be creative to add more heat sink to the TO220 packaged part so it can accommodate more power. The LM317 does have thermal shutdown, so it will protect itself from damage.It is a good building block, but do the arithmetic and use with care.

First two I’ve opened have performed exactly how I needed them to. So far, so good. I don’t have any reason to knock off a star.

Just be sure to have some cooling on the heatsink. This little guy gets quite hot. Had to include a small fan in one of my designs because this guy melted the plastic around it.

I’ve purchased 4-5 different converters over the past 4 years of working with Arduinos. Some were too bulky. Most don’t provide any easy mechanism to secure the board inside the electronic project box. And some are very small and require soldering.This board is a great combination: large enough and with screw connections so it’s easy to work with, but still small enough that it’s easy to fit inside a project box. Has holes that make it easy to attach.This will likely be my go to converter for future projects.

this item is not what it is described as. the lower the required output voltage the hotter the item gets as it tries to dissipate the excess voltage. output voltage fluctuates.USE WITH CAUTION !

The circuit is, by appearances, a voltage regulation circuit, but not a 'buck' converter circuit (even thought 'Buck' was in the item title at the time of purchase). For a buck circuit in its customary form, a notable inductor is crucial. This circuit board does not have such an inductor. As this is not a buck circuit, it behaves more like a resistor that automatically adjusts to interject just the correct amount of resistance to accomplish the needed voltage drop. Depending on voltage and current, this can cause rapid heat build up and be quite inefficient. A heat sink of the size on this circuit board won't dissipate many watts of heat rapidly. If I can't repurpose these, I may return them.

These are great if you're into hardware hacking! Voltage out is stable even with big input voltage changes. It looks like you need 1.50v more than the output for this to work, which is great! I like the compact footprint, screw terminals, and the mounting holes.I have some bare LM317s but rarely use them because I have to add a pot, cap, connections, etc.; it just takes too much time. I'll happily grab one of these instead!

Ok to adjust DC voltage down to stable 12-14 from solar system

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