Description
Circuit principle: Q1 and its peripheral circuit form a simple amplifying circuit. MK converts the sound signal into an electrical signal, which is coupled to Q1 through C2 to amplify a voltage signal with a high and low change at the collector of Q1. A voltage with sufficient amplitude is sent to the counting input terminal (pin 14) of CD4017. Every time a pulse arrives, The high level of the Q0-9 output of the counter moves one bit in turn to turn on the corresponding light-emitting two tubes, thereby producing the effect of the water lamp.
