Delivered without instructions -- where can a 'user's manual' be found?

Hi, there is a PDF Instructions on the product page -- Product information -- Technical Specification -- User Manual pdf https://images-na.ssl-images-amazon.com/images/I/C1X8DiomGTS.pdf Hope it could help you.

Is the usb output fixed or is it adjustable?

It's not fixed. I had it as high as 13.3 volts in my application of the USB connector. You need to set output to 5v before using any standard usb device.

In the instructions it says to use a diode if using for charging, where does the diode go?

There are two good answers here; when charging a battery with this converter, a series diode should be placed between this device's output and the battery to prevent the battery from attempting to backcharge this device if this device's output drops below battery voltage. In addition... if this device is used as a charge controller for a phototaic (solar) panel, a series diode should also be placed between the panel and this device to ensure that this device will never attempt to backcharge the panel. I suggest the use of a fairly significant Schottky diode for either application.

Constant output voltage with changing input voltage? If I have solar panels as an input with a chaning voltage (+-. 5V) will this affect the output?

Check the limit of input shown in the instruction manual. This unit will regulate voltage or amperage, but not both at the same time.

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⚡ Power your projects with precision and protection!

DIY BEYOND - Perfect for solar controllers, LED drivers, and custom electronics—empower your innovation.
VERSATILE USB PORT - Charge or power USB devices directly, adding convenience to your workspace.
ROBUST SAFETY SUITE - Built-in short-circuit, over-temperature, and reverse polarity protections keep your projects safe.
PRECISION POWER CONTROL - Adjust output voltage from 1.5V to 32V with fine calibration for exact needs.
CLEAR REAL TIME MONITORING - Large digital LCD shows voltage and current simultaneously for instant feedback.

The DC Buck Module is a high-performance adjustable step-down voltage regulator supporting 6V-32V input and 1.5V-32V output with up to 5A current. Featuring a large LCD for real-time voltage and current display, it includes multiple safety protections and a USB port, making it ideal for DIY electronics, solar power controllers, and LED drivers.

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Item Weight	0.15 Pounds
Item Dimensions D x W x H	1.57"D x 2.58"W x 0.98"H
Mounting Type	Pad Mount
Current Rating	5 Amps
Power Source	Battery Powered
Minimum Frequency	60 Hz

DROK DC Buck Module, Adjustable Buck Converter Step Down Voltage Regulator 6V-32V 30V 24V 12V to 1.5-32V 5V 5A LCD Power Supply Volt Reducer Transformer Module Board with USB Port Protective Case

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