Clap to turn On/Off mains powered devices. Uses attiny13 uC and moc3061 triac.
Two claps (Or any sound pulses) within a short interval will trigger the triac to turn On/Off.
Schemetics / PCB files : https://easyeda.com/cakeng/clapmains
AC mains circuits are dangerous and can cause severe injuries, fire, or death. Use at your own risks.
(Can be also modified to turn On/Off non mains circuits.)