It took me all week but I'm finally done with the assembly of the prototype PCB. I had multiple issues mostly related to overestimating my own SMD soldering skills! The board look awesome and everything works very well.

I'll rework the PCB to use a few bigger parts since I got plenty of space and I will order another batch that will hopefully be the final one. I'll work on the DB25 level shifter board PCB next.

Here a list of the various issues:

1. I had some trouble right away applying the paste using the stencil. Most of the paste for the FTDI chip got stuck in the stencil when I removed it.
   So I had to put the paste manually which turnout out to create a lot of shorts. I end up removing the chip entirely and start again.
2. 3/5 of the ESD chips used for GPIOs and SD card had 2 pins short, I had to remove those chip and install again a few times until it worked. I will replace those chip with bigger part for the next PCB version.
3. I had used the reverse version of the LDO previously which had the thermal pad connected to VOUT. I decided to use non-inverted version for BlueRetro and assumed it would be the same since the datasheet made no mention of what the Tab pin was. Turn out that I was wrong and on a SOT-223 package you need to know that the tab is always tied to pin 2. I simply had to cut two traces on the PCB to fix this.
4. I made the mistake of using a 0201 package for a diode. While 0201 is possible to do by hand for a cap or resistor, it's completely impossible to do for a diode since it needs to be in the right orientation on all 3 axes! I ordered a bigger one and hacked the PCB a bit.
5. I use jumpers to connect ESP32 TX/RX pins to the UART-USB bridge and I got it wrong, so I needed to use jump wires to cross it.
6. USB didn't get detected by PC, after troubleshooting I notice I had 0V on the 1V8 rail! I had a cold joint on the 1V8 output pin of the FTDI chip.
7. FT_Prog didn't detect the EEPROM and the TX/RX LEDs didn't work. Turnout I had another cold joint on one of the FTDI 3V3 pin.
8. Forgot to add header pins name on silkscreen.

Here a list of the various tests I made with the board:

• Reset & Boot switch work.
• UART over USB A-C and C-C cables work.
• Auto-program circuit work and ESP32 is successfully programed without touching any switch.
• SD cards work and do not interfere with ESP32 programing.
• ESP32 can be powered by either USB VBUS or from console VIN (5V or 3V3) power.
• Connected 7 Bluetooth controllers.
• Tested 4 players with rewired N64, GC & Dreamcast cables.
• Mechanical fit with Raspberry Pi case is perfect! Only need to cut the cover two tabs and making one of the HDMI hole a bit bigger.
• When ESP32 is powered from system VIN, tested I can see the boot log from UART when I power on the system.
• JTAG interface via OpenOCD work.