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The Big-E Stereo Parabolic Microphone - This device is a stereo
amplifier for a high sensitivity stereo parabolic microphone. It can be
used for listening to distant sounds. Typical parabolic microphones are
monophonic, this unit has a stereo audio path that helps produce more
realistic sounding audio. The Big-E can be used with headphones or as an
audio source for a stereo tape recorder.... [(C) G. Forrest Cook January
1, 2005]
The Emperor's New Amplifier - I spent much of 1997 designing
and building my ultimate dream amplifier, which I named "The Emperor's New
Amplifier"TM (TENA) for a quality it shares with the fabled emperor's
wardrobe-- transparency. It was also an oblique reference to the marketing
hype that pollutes high-end audio. I thought about commercializing it,
especially when the lab where I worked announced it was s....(design added
004/02/02)
The GEM: Class-A//AB Amplifier - The GEM is an audio power amplifier
embodying simultaneously active Class A and Class AB output stages for 100+
Watts into a 4 ohm loudspeaker. The front end pcb will drive up to 100+W
variants, or the 200+ Watts version into a 4 ohm loudspeaker load. (design added
01/2010) [Circuit designed by Graham Maynard]
The Kumisa III Headphone Amplifier - A discrete all-bipolar, zero
feedback class A amplifier with a new opamp-based servo. The servo operates
outside the audio feedback loop by controlling a pair of current mirrors at the
input stage. Designed by Benny Jørgensen (Circuit design added
01/08)
The Leach Amp - One amplifier builder found that the 2N5416 PNP
transistors that he purchased were NPN. I have tested them and verified
this. Two of the transistors are shown in the linked photo. They are
identified by the letters ON surrounded by a circle, signifying they are
products of ON Semiconductor. You can check....(added 07/07/07)
The Morgan Jones Mini Tube Headphone Amplifier - This
reverse-engineered version of the famous EarMax headphone amplifier has
just 3 tubes, uses no global feedback, and is powered from an 19VAC
wall-wart. Includes two additional versions of this amplifier optimized
for driving low impedance headphones and simulation files for use with
OrCAD Lite software. Designed by Chu Moy (Circuit design added
01/08)
The SESS Tube Headphone Amplifier - The author describes the
construction of a very simple single-ended, single-stage, single-tube (SESS)
tube headphone amplifier with a reference power supply that uses a tube
rectifier in a hybrid Graetz bridge configuration. Designed by Andrea
Ciuffoli (Circuit design added 01/08)
The Technology of the Fuzz Face - The Fuzz Face remains an enigma
today, perhaps three decades after it first hit the market. This simple,
two transistor circuit remains for many the very definition of the guitar
effects stomp pedal. What makes such a simple circuit the stuff of
legend?....(Circuit design added 04/05/06)
The Zen Headphone Amplifier - A single-ended, class A MOSFET headphone
amplifier with an active current source that results in increased efficiency
(50%) and lower distortion. The active current source is based on a patented
design featured in the Aleph power amplifiers from Pass Laboratories.
Designed by Marcello Pellerano (Circuit design added 03/08)
