DSA00334693.pdf by Nippon Precision Circuits

Partial File Text SM1155 series Melody LSIs OVERVIEW The SM1155 series are CMOS melody LSIs that, together with a battery and piezoelectric buzzer. They also feature an oscillator stop function in non-play mode a
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"Light-Dependent Resistor" boler buzzer piezoelectric circuit Light-Dependent Light-Dependent Resistor Light-Dependent Resistor features piezoelectric buzzer piezoelectric buzzer 1.5V piezoelectric driver frequency variable SM1155