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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Description

⚡ Power your projects with precision and confidence!

COMPACT DURABLE - Protective case included for easy installation and long-lasting reliability
REAL TIME MONITORING - Clear LCD screen shows voltage and current simultaneously for instant feedback
VERSATILE USB OUTPUT - USB port delivers adjustable voltage, perfect for powering or charging diverse gadgets
ROBUST SAFETY FEATURES - Built-in over-current, short-circuit, reverse polarity, and over-temperature protections keep your devices safe
PRECISION POWER CONTROL - Fine-tune voltage from 1.5V to 32V for any project need

The DROK DC Buck Converter is a compact, adjustable voltage regulator supporting input voltages from 6V to 32V and output from 1.5V to 32V at up to 5A. Featuring a large LCD display for real-time voltage and current monitoring, it includes multiple safety protections and a versatile USB port. Ideal for DIY electronics, solar controllers, and sensitive RF circuits, it combines precision, durability, and user-friendly design to elevate your power management solutions.

Specifications

ASIN	B07JZ2GQJF
Best Sellers Rank	#20,818 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #85 in Power Converters
Brand Name	DROK
Current Rating	5 Amps
Customer Reviews	4.4 4.4 out of 5 stars (1,935)
Item Dimensions D x W x H	1.57"D x 2.58"W x 0.98"H
Manufacturer	DROK
Minimum Frequency	60 Hz
Model	180080AFA
Mounting Type	Rack Mount
Part Number	180080AFA
Power Source	DC
Unit Count	1 Count

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DC Buck Converter

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