Is this ok for 7.5v to 5v?

Yes. That's a step-down module 4.0-38V to 1.25V-36V.

Is this just a voltage regulator or a power converter

This isn’t a voltage regulator, that costs a lot more.

Hey, could i technically use this to change a 24v to 12v? Because I`m switching out the stock fan for a 3d printer to make it quieter.

According to its specification it is capable of stepping down the voltage from 24v to 12v There is adjustment available so it could be monitored with a separate multimeter as you set it up.

Hi, how do you configre the module? It is only outputting the same as the input, i cant get it to reduce?

From the description above... "When you turn the potentiometer and there is no reaction, you may have to turn the potentiometer many turns." No kidding, I had to turn the pot. about 10 full turns counterclockwise before it did anything. Also, see https://youtu.be/Girj7DJ1SL8 to calibrate it.

Brand	HALJIA
Model Number	1
Package Dimensions	11.4 x 6.8 x 1.6 cm; 20 g
Item Weight	20 g

5A 75W XL4015 DC-DC Converter Adjustable Step-Down Module 4.0-38V to 1.25V-36V DIY Power Supply Compatible with Arduino Raspberry Pi DIY Etc

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