The sound decoder switches the relay when the audio signal of 1 kHz is detected. Easy installation: Just connect the audio source to the input connector of the PCB Board (looping through). As soon as the sound decoder receives the audio signal of min. 1 kHz, the relay switches ON or OFF. With this Sound decoder you can control easily light sources, motors, pumps, etc.
Applications: Installations in Museums/Exhibitions, Art Installations, Model-Railway Technics, etc.