Circuit Lake

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Low-Frequency Oscillation (LFO) is an audio signal usually below 20 Hz which creates a pulsating rhythm rather than an audible tone. LFO predominantly refers to an audio technique specifically used in the production of electronic music. Ray Wilson designed nice Voltage Controlled LFO (+/-12V to +/-15V) for your modulation needs.

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The project used interesting approach for reducing speaker distortion and increasing bass response. A dual coil speaker driver is used but only one of the coils is connected to the power amplifier – the other is used for electromotive feedback. This method is not new, but is difficult to implement in pure analogue world [...]

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Spectrum analyzers are employed in most of the modern signal processing systems for measuring the distribution of signal energy in frequency. An audio spectrum analyzer is used for measurements in the audible frequency spectrum (from 0 to 20000 Hz) and can be a very powerful tool for keeping a studio well tuned. A Digital, [...]

This project is an experiment of the Digital Signal Processing based on microcontroller AVR AtTiny 26 instead of an ordinary digital signal processor. The project used as simple audio signal processing. There are some simple audio processing, such as Delay, Echo, Pitch Conversion, that easy to experiment with the project.

The aim of this project was to add remote-control convenience to the hi-fi preamp without compromising sound quality. It replacing the existing volume control with high-quality optical rotary encoder controlled by PIC 16F877. The project has 7 input sources and 5.1 surround sound.

This audio player project is very simple and only need few wires to be soldered. The main part is 8-pin microcontroller and SD memory card. The chip use ATtiny05 series (25/45/85) 8-pin AVR microcontroller. The AVR has two fast PWM outputs in 250kHz carrier frequency that can output wide frequency range audio signals. As storage, [...]

This is mini sound level monitor project. It will display fluctuating light bars as response of audio signal from Electret Microphone. The louder sound that come into this device, the brighter the light bar. This project use alkaline battery as power source.
The ‘brains’ of this project is a LM358 general-purpose op-amp. The front part of [...]