yake
Parameters
Input Voltage Range: 6.5 to 36V
Output: 5V (PM-5033-1) or 5V / 3.3V (PM-5033-2)
Max Switching Current(Adjustable channel): 3A
Output Voltage Initial Accuracy : 2.5%
PCBA Size: 19 * 14.5mm
Operation Temperature: -40 to 125°C
Storage Temperature: -65 to 165°C
Notice:
The 3.3V current consumption will share from 5V channel , that means the 5V load capacity will included 3.3V’s load, for the example , if 3.3V draw 500mA current consumption , the 5V channel have to limit output current to 2500mA - 500mA = 2A
W4KRL
Miquel Tutusaus
icstation
Junk Chinese electrolytic caps. i wouldn't want to see them on a module.
The typical 1117 regulator can get unstable and might oscillate when you use ceramic bulk caps as their ESR is too low for this old part.
See top answer: https://electronics.stackexchange.com/questions/18384/why-does-the-lm1117-data-sheet-specifically-specify-tantalum-capacitors
And yes, I have captured oscillation on a scope. You can fix this by using a 1 ohm resistor in series to increase the ESR.