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Low Frequency Sinewave Generators
Low Frequency Sinewave Generators
December 28, 2010

The two circuits illustrate generating low frequency sinewaves by shifting the phase of the signal through an RC network so that oscillation occurs where the total phase shift is 360 degrees. The transistor circuit on... [more]

Triangle and Squarewave Generator
Triangle and Squarewave Generator
December 27, 2010

Here is a simple triangle/squarewave generator using a common 1458 dual op-amp that can be used from very low frequencies to about 10 Khz. The time interval for one half cycle is about R*C and... [more]

555 Tone Generator (8 ohm speaker)
555 Tone Generator (8 ohm speaker)
December 27, 2010

This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN... [more]

Electronic Siren
Electronic Siren
December 19, 2010

An electronic siren made from discrete components. [more]

Oscilloscope testing module (huntron circuit)
Oscilloscope testing module (huntron circuit)
December 10, 2010

Oscilloscope testing module (huntron circuit) [more]

One-IC two-tones Siren
One-IC two-tones Siren
December 8, 2010

This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. [more]

Cuckoo sound Generator
Cuckoo sound Generator
December 3, 2010

This circuit generates a two-tone effect very much alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. [more]

Function Generator
Function Generator
December 3, 2010

Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. [more]

Low-distortion Audio-range Oscillator
Low-distortion Audio-range Oscillator
December 2, 2010

Producing low-distortion sine waves, this oscillator operates over the range 16 to 22000 Hz. [more]

Sound Effects Generator
Sound Effects Generator
November 30, 2010

This circuit uses a UM3561 IC to produce four different sound effects [more]



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