Sound generator and oscilator circuit diagrams

Sine Wave Generator

A classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps.

Sound Effects Generator 2

This circuit uses the Holtek HT2884 IC to produce 8 different sound effects.

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

Metronome Circuit

A metronome circuit based on a simple astable. The output sound is distorted to emphasize the pulses.

One second Audible Clock

A beep or metronome-like click and/or a visible flash, will beat the one-second time.

Sound of Light Circuit

The circuit uses a solar cell as the input transducer, blocks the DC produced by the cell, but amplifies the light received by the cell. Sunlight, moonlight, torchlight all produce sound which is amplified by this circuit.

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