Ok, here's the transponder schematic.
RCHourglass transponder REV A
Like the decoder, it can be build on perfboard and it's very simple.
Soon I'll publish the firmware and the build report for the transponder.
Please make sure you're using the correct PIC16F18313 and not the PIC16
LF18313. The L stands for low voltage, so you're gonna fry it in this circuit. This is my first KiCad drawing... and it shows
The antenna driving method is just like Howard's transponder, but all the driving is done inside the PIC. The P Mosfet is a reverse polarity protection and can be omitted if you're sure you're not ever going to mess with your cabling (keep it
). The LED is a low current red led, and the input capacitors C1 and C2 are rated at 16V in my prototype.