Sound generator circuit diagrams

Pulse-Generator & Signal-Tracer

Dual-purpose test-instrument. Very simple circuitry, 1.5V Battery-operated

Bells ring Generator

Three circuit options. Can be synchronized to Christmas tree flashing lights

Ultrasonic Dog Whistle

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.

Cuckoo-song Generator

Agreeable, very close sound imitation. Suitable for sound effects, door-bells etc.

One-IC two-tones Siren

Double-tone Police sound. Single-tone old ambulance sound

Electronic Doorbell with Counter

This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors.

Cricket Chirping Generator

Funny gadget for props and jokes. 5 - 12V Battery operation

Insect Repellent Circuit

Repell those repugnant insects from your Garden this Summer with this insect repellent circuit. Designed by Graham Maynard the circuitry consists of a phase locked loop (CMOS 4047) wired as a 22KHz oscillator.

Precision Metronome & Pitch generator

Precision Frequency generator 1 to 999 Hz. Precision Metronome 1 to 999 beats per minute