The pins are: 1: EN 2: IN+ 3: GND 4: VO+. Note that some or all of these steps may damage the device (if for instance it wants too much current and the input voltage drops and the device doesn’t like under voltage), so only do it if you don’t mind perhaps damaging the device. complete name: PEMENOL DC to DC Buck Converter 12-24V to 5V 3A Adjustable Power Supply Step Down Module 97.5 Height Efficiency Power Supply Transformer Module for Arduino, Raspberry Pi. voltage regulator have a higher voltage on its output than it does its input. Then find a wall wart with at least twice that current capacity and regulated 5 volts and you should be away (either find one with an appropriate barrel jack or solder a new barrel jack on to the wall wart). Voltage and Current Limiting Power Supply for Breadboard Prototyping. If you have a 5 V supply and an ammeter, after determining the polarity of the power jack you could feed it 5 volts from the power supply and measure how much current it draws (check that the voltage remains 5 volts too, if the device draws too much current the supply voltage may drop as well). Is there a 10V (100mA) power supply part in fritzing parts help IvoLimpens February 15, 2020, 1:36pm 1 For (the schematics of) an assignment, I am looking for something that could function as a 10V (100mA) power supply But so far, I haven’t been able to find a part for it. An ohmmeter connected to USB ground then to the two pins of the barrel connector in turn should maybe identify which one is ground (making the other the 5V pin). Assuming the USB connector on the device is powered by the device, the ground pin on the USB connector (a USB breakout board would be the easy way to find that) should connect to the 5 Volt ground. Connecting it up backwards will likely blow the device. Usually (but not always) the center pin is positive. There is a Fritzing part for the tp5100 module and that may do (it I think both provides protection and charging for the 18650.) Peter.

(which typically has no protection) and your circuit. The max input power supply voltage is 4.4V max so a direct connection to a 18650. Ah! So you have a couple of issues: you need to know how much current it needs (solvable by giving it a supply with too much, as it will only take what it needs) and most importantly to know which pin on the barrel connector is positive. It appears the module itself is running at 2.8V internally.

Fritzing high voltage power supply part