In this article SAB0600 of SIEMENS produces integrated circuits made with electronic gong will tell. SAB0600 integrated 8-pin, 3 times a gong sound that is integrated.
Integrated circuits are created with few elements that connect the outside. 22K potentiometer to set the tone of the gong sounds. 8 ohm speakers for audio output of the circuit is used. Each press of the button triple gong will sound from the speaker.