Use 12V trigger from Denon AVR to switch NAD C352 on and off together.
This is a reimplementation of this project for the RISC-V CH32V003 MCU.
The Denon AVR has a 12V trigger output, that is high when it's on and low when it's off. Trigger is read through a voltage divider (30kΩ - 20kΩ, giving 12V -> ~4.8V) on C2.
The NAD has an external IR in, which takes Extended NEC IR commands (without a carrier wave). Just connect a 3.5mm jack from the external IR input on the NAD to D2.
The IR signal is sent with this direct NEC transmitter library.
