The main PCB of the repeater consist of two SA818 modules and an ESP32. There is also a few passives on board for the ESP32 and also for linking the audio. 

The board is currently at https://easyeda.com/chibill/fm-repeater , unfortunately I figured out too late that I need a few more passives on the audio lines to allow the ESP32 to monitor and also send into it.  I will be fixing the PCB on EasyEDA soon but for my own boards I will just be bodging them in. 

The SA818 modules will manage the PL tones as it has built in support for them. The ESP32 will manage actually the keying for the transmit side. This is to allow the ESP32 to cut out transmission after some amount of time.  

Some may notice that the board has no filtering. This is because this is only the RX/TX board not the amp or filter. Plus this also allows this board to be used with the SA818 boards that support 2m or 70cm with out changing parts.  You could even put one as a 70cm and the other as a 2m to make a cross band repeater. 

I am going to work on assembling the board soon.