Sound generator and oscilator circuit diagrams
An electronic version of a chirping canary. May be used as an alarm, a sound effects generator or perhaps a replacement doorbell.
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Dual-purpose test-instrument. Very simple circuitry, 1.5V Battery-operated
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An electronic siren made from discrete components. A push button switch is used to create the sound, which rises in pitch when the switch is pressed, and falls in pitch when the switch is released.
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This circuit uses a UM3561 IC to produce four different sound effects.
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A very basic square wave generator using a CMOS 4011 NAND gate.
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Three circuit options. Can be synchronized to Christmas tree flashing lights
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It's well known that many animals are particularly sensitive to high-frequency sounds that humans can't hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz.
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Linear scale - Small size. 40 to 208 beats per minute
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Agreeable, very close sound imitation. Suitable for sound effects, door-bells etc.
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Double-tone Police sound. Single-tone old ambulance sound
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