| 摘要 |
A switching melody circuit is provided to enable a contact point to be alternately operated by a push switch so that a user can have a pleasant experience of an electronic circuit by selecting a favorite melody. A switching melody circuit comprises the following parts: a ZD(Zener Diode) circuit which is composed of a 330ohm resistor, a 3.9kiloohm resistor, and a ZD; a push switch which alternately operates a melody IC(Integrated Circuit)(66T-19) and a melody IC(66T-32); and an amplification circuit which is composed of a 3.9kiloohm and a transistor between the melody ICs and a speaker.
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