ANTI-PLOP Removes RX to TX and TX to RX switching "plop"
The A-PLOP Anti-plop kit is discontinued.
However, you can freely build it yourself
I share the file to make the PCB (Sprint Layout 6.0). Download.
You will need to have the Sprint Layout viewer. Download.
A-PLOP uC PIC12F683 .hex file Download.
A-PLOP kit assembly manual (schematics, parts list etc). Download.