I took the cloned UNO R3 design from Shamduino, replaced the FTDI chip with CH340 chip. FDTI costs about $4.50 each from legit source, and fake FTDI may be cheaper but once before a driver update bricked fake chips. CH340 is cheaper and there’s no driver bricking but you may need to manually install the driver on Windows and Macintosh. I also tweaked a few things. You have a choice of CH340G (cheaper, requires 3 additional components) or CH340C (doesn’t required additional components but slightly more expensive).

Soldering CH340, the dual op amp, and one MOSFET is probably the hardest part of this board.

I kept most of the parts the same using larger SMD for easier soldering. Printable copy of part location map and BOM can be seen below: “A” on map denotes anode of diodes, observe polarity! Also watch for notches or pin 1 marker on the 3 ICs. Orient the polarized capacitor with the angled end matching silkscreen. Crystal oscillators, ceramic capacitors, and resistors are non polarized and can be installed any way without issues.

text based BOM:

*CH340G requires external oscillator and 2 capacitors. If you have CH340C instead, the oscillator and 2 capacitors marked C15, C16, and Q1 above can be omitted.