DROK LM2596 Buck Converter 5pcs, Step Down Converter DC Voltage Regulator Adjustable 4.5-40V to 1.25-37V (36V 24V 12V 9V 5V 3V) Variable Voltage Stabilizer Power Supply

Works really well. You can take an old used wall transformer and step it down to whatever voltage you want; cheaper than buying new power supplies. Was easy to hook up.

If you order a set, use extreme caution adjusting output voltage. It was not possible to adjust the output voltage on three and the other two would jump up and down 3 or 4 volts until they landed near the value I needed. Once set, they hold the output setting and they don't require any further attention.

These work very well. They can be adjusted over a large voltage range and seem very robust. There's an enable pin that is broken out that can be used to turn on the regulator after a slow power supply comes up. See the datasheet for info.

Didn't expect that. Very good, all work, pretty much perfect. Powering an old android phone off of 24AC, rectified and needed to step the ~30VDC down to 3.7 to go directly into the battery contacts of the phone. Nice and smooth power, phone is happy and so am I.

Just fired up the first one, it works great. The build quality looks good and, it works as expected.

They flat out did not work. Junk

I have bought these prior. They are very well made. Very dependable. With all my assorted projects they are just great.

Works great and is well made