[Mic] then tuned to the internal oscillator of his ATtiny microcontroller with this ... is implemented by feeding the mains into an AC optocoupler. [Mic] discovered that the optocoupler diodes ...

As the chip shortage hit, a lot of the familiar ATtiny chips have become unavailable and overpriced, and it mostly stayed the same since then. If you ever searched for “ATtiny” on your ...