Circuit as shown. It consists of relaxation oscillator, pulse count were frequency circuit, SCR control socket circuits, voice circuits and exchange music buck rectifier circuit. It issued a simulated natural wind, it is also accompanied by 12 world famous theme of the broadcast, giving the United States pleasure. VT1 single junction transistor BT33, it R1 ~ R3, C1, etc. to form a relaxation oscillator, the oscillation period:
where is the single-junction transistor divider ratio, BT33 of ?=0.3 ~ 0.55. Icon parameter oscillation period To=4.5 ~ 7.5s. RP1 to adjust the oscillation period around the 6s.