music in a chip

This 1-chip module can generate 9 different melodies. It is normally used as a doorbell, an acoustic signalling device or as a telephone `wait` melody. Once switch S1 is pressed the IC plays the melodies one after the other. It will stop after the last melody when the JP1 terminal is connected to ground by a jumper. Alternatively, when JP1 is conn

ected to the +V, the IC will play continously as long as the switch S1 remains closed. Combining several pins produces different effects as shown in Table 21. 0. A single battery can be used to power this module since its current consumption is negligible.

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