Audio Line Level Signal Detection "Auto On-Off Mains Switch" Blank PCB 2pcs

Switches-on the relay when it detects an audio signal, and when the audio signal is lost, it switches off after a preset time delay. Preset delay and signal sensitivity are adjustable through trimmer.

Specifications
Supply Voltage: 12V DC or AC
Comparator IC: LM358 DIP8
Input Impedance: 10K
PCB Size: 2 x 3.125 in