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Audio preamplifier circuit diagrams
November 30, 2010
This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone. [more]
November 16, 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]
October 16, 2010
In recent years, following CD's introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old vinyl discs from a well preserved collection. [more]
October 15, 2010
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum... [more]
September 26, 2010
This module can be a necessary addition to the Modular Preamplifier Control Center when more than two sources need to be connected to the preamplifier chain. Four high level inputs can be selected by means... [more]
circuit from:http://www.extremecircuits.net/2010/03/four-high-level-inputs-double-bar.html
September 26, 2010
In recent years, following CD's introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old vinyl discs from a well preserved collection. This simple but efficient circuit devised for... [more]
circuit from:http://www.extremecircuits.net/2009/07/phono-preamplifier.html
September 26, 2010
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing an ac voltage gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently... [more]
circuit from:http://www.extremecircuits.net/2009/07/stereo-preamplifier-with-bass-boost.html
September 26, 2010
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum... [more]
circuit from:http://www.extremecircuits.net/2009/12/portable-microphone-preamplifier.html
September 26, 2010
To complement the 60 Watt MosFet Audio Amplifier a High Quality Preamplifier design was necessary. A discrete components topology, using + and - 24V supply rails was chosen, keeping the transistor count to the minimum,... [more]
circuit from:http://www.extremecircuits.net/2010/01/moduler-preamplifier-circuit-diagram.html
August 8, 2010
A unit which is often very useful, if we need to isolate, in sound circuits, two stage between them. Then we can use this circuit which has an amplified unit, which gain X1, we do... [more]
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