Setting Up the Buck Step-down Power Converter Module

Click SHOW MORE for answers to the most common questions. For additional details, please watch the video.

Many people have questions about setting up and adjusting this very useful $2.00 electronic module being sold online. This video explains how to use the module both as a voltmeter and as a voltage converter. Please note that there is no audio for the first 30 seconds (or so) of this video.

I am not affiliated in any way with sellers of this device. I made the video in response to questions that were asked on a model railroading discussion forum.

Answers to Common Questions:

1. According to the eBay seller from whom I purchased this module, here are a few of its specifications. I have NOT independently verified these specifications.
Input voltage: 4-40 VDC
Output voltage: 1.25-37 VDC
Output current: 2 A
Voltmeter range: 0-40 VDC

2. This module uses the LM2596S regulator chip. There are many similar modules of this type available online. Some of them use the LM2596S; others use a different regulator. However, I have not experimented with any module other than the exact unit shown in my video. Other modules may have different specifications or may perform differently.

3. This module is a step-DOWN voltage converter. The output voltage can NEVER be greater than the input voltage. The module cannot be used as a step-UP voltage converter.

4. Some users of this module have complained that the output voltage does not change when the small brass adjustment screw is turned. Try turning the screw counter-clockwise MANY times. It may require 10 or more counter-clockwise turns before the output voltage begins to change.

I have five of these modules, and all of them have required at least 10 counter-clockwise turns of the adjustment screw.

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Jeff