[disclaimer - I am new in DIY and this is the first PCB I designed myself]
I designed a PCB for a very simple ESP8266 12-F + RGB LEDs project.
I assume that I am doing something fundamentally wrong because the voltage regulator is connected to a 5.1..5.4 V, 500 mA supply but outputs 4.4 V instead of 3.3 V.
Note that the AMS1117-3.3 regulator uses the tab as another VOUT.
Note also that only the power-supply, the capacitors, and the regulator are currently mounted to the board. The ESP and LEDs are not yet on the board.
For details check the schematics screenshots below:
Any hint/help is highly appreciated!
EDIT: I am terribly sorry, just noticed that the actual design which was printed indeed was using the full-copper approach:
UPDATE: In the meanwhile my ordered 22uF smd tantalum capacitors arrived and I did some experiments:
- 22 uF capacitor without resistor -> 4.34 V
- 22 uF capacitor + 330 ohm resistor -> 4.22 V
- 22 uF capacitor + 100 ohm resistor -> 4.00-4.01 V
- 22 uF capacitor + 10 ohm resistor -> 2.68 V
So my follow-up question here would be if this is expected output? And do I need to use one of the resistors if I want to connect the ESP now?