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Audio circuit diagrams
August 5, 2010
Commercially available hearing aids are quite costly. Here is an inexpensive hearing aid circuit that uses just four transistors and a few passive components. [more]
circuit from:http://www.extremecircuits.net/2009/07/hearing-aid.html
July 2, 2010
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with... [more]
July 2, 2010
This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control... [more]
June 26, 2010
The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance. The mixer is formed assembling three main modules that can be varied... [more]
June 23, 2010
This add-on board is designed to provide a pair of balanced audio outputs for the High-Quality Stereo DAC (Digital to Analog Converter). Two 3-pin male XLR connectors are used for the new outputs and they... [more]
circuit from:http://www.extremecircuits.net/2010/03/balanced-output-board-for-stereo-dac.html
June 23, 2010
The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies. In the low frequencies is degraded the sense of direction. This reason us leads to the utilization... [more]
June 22, 2010
Stethoscopes are not only useful for doctors, but home mechanics, exterminators, spying and any number of other uses. Standard stethoscopes provide no amplification which limits their use. This circuit uses op-amps to greatly amplify a... [more]
June 22, 2010
Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. [more]
June 22, 2010
Tendency of catering: 15V Force of expense: 4,2Wrms in the 4W Minimal signal of entry: 94mVp-p with preamplifier, 0,65Vp-p without the preamplifier. [more]
June 22, 2010
Amplifier 2x30W with STK465. Small number of components. [more]
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