LM2596 DC-DC Buck Power Converter Module, Adjustable Voltage Regulator 4-40V to 1.25-37V Buck Converter with LED Voltmeter Display（Pack of 3）

LM2596 DC-DC Buck Power Converter Module, Adjustable Voltage Regulator 4-40V to 1.25-37V Buck Converter with LED Voltmeter Display（Pack of 3）

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LM2596 DC-DC Buck Power Converter Module, Adjustable Voltage Regulator 4-40V to 1.25-37V Buck Converter with LED Voltmeter Display（Pack of 3）
Price: $9.99
(as of Feb 14,2026 10:52:15 UTC – Details)

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To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.Learn more how customers reviews work on Amazon






Customers say

Customers find the power converter works well, with one mentioning it successfully converts 12V to 5V. They appreciate the adjustable output, with one customer noting it's easy to set.

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19 customers mention functionality, 15 positive, 4 negative

Customers report that the power converters work as advertised, with one customer specifically mentioning their success in converting 12V to 5V and another noting their effectiveness for dual supply projects.

Works well. Read direction's on how to adjust . You have to put it in a mode by medium button press. Takes a few tries to get it into that mode….Read more

Works great and accurately drops voltages for me….Read more

Works as advertised.Read more

…of pushing the little button short and long presses, it would not have an output voltage other than the same as the input voltage which was 12 V DC….Read more

5 customers mention output, 5 positive, 0 negative

Customers appreciate the power converter's output capabilities, with one mentioning it can be adjusted to get the desired voltage, and another noting that the mode button changes between input voltage settings.

Works great and accurately drops voltages for me. The mode button changes between input voltage, output voltage, and can be long pressed to disable…Read more

…Using a good 12v input is important. The output is easy to set. The drawback is that one cannot set the display to show the output permanently….Read more

…Tapped off the 12 Volt supply for input to the Buck supply. Adjusted for 4 Volt output. One 12 Volt supply, 2 voltages for my project. Easy.Read more

PERFECT. I love how easy these are to adjust and not having to measure with a handset/multimeter while doing it….Read more


These are awesome

5 out of 5 stars

These are awesome
I've been assembling 9V buck converters and displays to power guitar pedals and my Pignose amp from a 4S1P battery pack. With the PCB pre-drilled for mounting, it's cleaner than my previous solution. Still small enough to mount anywhere. Pictures show 16V input and 9V out
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Top reviews from the United States


  • michael C.

    5.0 out of 5 stars

    Stable no drift.

    Reviewed in the United States on January 28, 2026

    Style: 2PCSVerified Purchase

    Works good, flexible.


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  • Gregory G Class

    5.0 out of 5 stars

    Solid buck convertor – set voltage on the tiny pot, check in/out with the button

    Reviewed in the United States on November 29, 2025

    Style: 3PCSVerified Purchase

    Works great and accurately drops voltages for me. The mode button changes between input voltage, output voltage, and can be long pressed to disable the module.


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  • HobbsTiger

    5.0 out of 5 stars

    Dont' Buck this DC to DC Converter

    Reviewed in the United States on January 8, 2026

    Style: 6PCSVerified Purchase

    I purchased these for work. This is the second part of a two prong approach to keep one of our current optics vendors from destroying optical inspection fixtures we made for them. The other item is the Aclorol 5V 2A Power Supply Adapter. My boss an EE suggested these as the vendor has after a decade of using our fixtures suddenly forgotten how to power them & are applying too much voltage & current for the bare LEDs to endure.
    I checked out the operation of one of them when they arrived. I set the voltage to 3V and hooked it up to an inspection fixture & power supply. I cranked the supply up to 12V & current to 5A, more than enough to fry the naked LEDs. 3V came out of the dangerous end & the LED just smiled.


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  • Gold Country

    4.0 out of 5 stars

    Easy to use, with resulting accurate output, but…

    Reviewed in the United States on November 7, 2025

    Style: 2PCSVerified Purchase

    I'm using these to drop the voltage for certain LED indicators from 12 to 2.2 volts. Using a good 12v input is important. The output is easy to set. The drawback is that one cannot set the display to show the output permanently. I don't want to have to push a button to see the output every time I shut down the system and power back up.

    One person found this helpful

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  • James A. McGaw

    5.0 out of 5 stars

    Trustworthy voltage control

    Reviewed in the United States on January 30, 2026

    Style: 2PCSVerified Purchase

    I needed to bring the voltage down to 24 from 28.5 to keep from frying the amp This device not only did the reduction but showed the voltage in large led figures. It is consistent and doesn’t eat any energy.


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  • neithernet

    5.0 out of 5 stars

    These are awesome

    Reviewed in the United States on January 24, 2026

    Style: 8PCSVerified Purchase

    I've been assembling 9V buck converters and displays to power guitar pedals and my Pignose amp from a 4S1P battery pack. With the PCB pre-drilled for mounting, it's cleaner than my previous solution. Still small enough to mount anywhere.

    Pictures show 16V input and 9V out

    Customer image


    neithernet

    5.0 out of 5 stars

    These are awesome

    Reviewed in the United States on January 24, 2026


    I've been assembling 9V buck converters and displays to power guitar pedals and my Pignose amp from a 4S1P battery pack. With the PCB pre-drilled for mounting, it's cleaner than my previous solution. Still small enough to mount anywhere.

    Pictures show 16V input and 9V out

    Images in this review


    Customer image

    Customer image


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  • confirmed customer

    1.0 out of 5 stars

    Not consistent.

    Reviewed in the United States on December 9, 2025

    Style: 3PCSVerified Purchase

    Bought a pack of three.
    – one worked GREAT
    – one couldn't properly / reliably ascertain the input voltage
    – one was DOA

    So 33% success rate.

    Frustrating in that my projects are pushed back a week or so, but I guess one takes one's chances.

    Will try another set. If they're similarly inconsistent I'll try another brand… with my projects even further delayed.

    FWIW when they work as designed these are great for creating reliable power supplies for guitar pedals, synths (often needing 12v or they don't play in tune) from discarded laptop power supplies, which are inherently steady in voltage and current and can be found at GoodWill for very little outlay.


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  • Lisa M

    5.0 out of 5 stars

    Works well

    Reviewed in the United States on January 2, 2026

    Style: 3PCSVerified Purchase

    Worked perfectly to convert 12v to 5v for my LED controller.


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Product Summary: SELOKY LM2596 DC-DC Buck Power Converter Module, Adjustable Voltage Regulator 4-40V to 1.25-37V Buck Converter with LED Voltmeter Display（Pack of 3）

From Seloky
LED Numeric Display: The buck converter has an LED voltmeter that’s pretty accurate, with only ±0.1V error. It works with input voltages from 4.0V to 40V and outputs between 1.25V and 37V. Just so you know, if the input voltage goes below 4V, the voltmeter won’t work and the display will go off. To turn it off, just hold the switch for 1 to 4 seconds and let go. Once it’s off, you can turn it back on by tapping the switch quickly
LM2596 Adjustable Buck Converter: This is a second-generation voltage regulator that runs at 150KHz. It uses less power and works really efficiently. It also has high-quality solid capacitors that keep the circuit stable and durable while filtering out any high-frequency noise
Ease of Use: With the LM2596 buck converter, adjusting the output voltage is super easy—just use a mini screwdriver. Plus, it comes with terminal blocks, so you don’t need to solder anything unless you want to
Features & Safety: On the input side, two diodes protect the module in case of reverse polarity, so it won’t get damaged even if you connect it backward. It also has overheat and short-circuit protection, which is great for safety. If you’re using it for more than 15W, make sure to add some heat dissipation to keep it cool
Applications: The LM2596 buck converter is really versatile and works well in lots of different situations, like car power supplies, DIY projects, or industrial equipment. Whether you’re a pro or just starting out, this converter is a good fit for you

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