Here are some articles covering audio amplifiers. Some
articles are describing do it yourself amplifiers, on a non commercial
basis. The author has no responsibility what so ever regarding these
This brand new design is a DIY two stage MM Phono Amplifier, inspired by
Le Pacific Amplifier, a two stage JFET amplifier. It is a two channel
amplifier meant for moving magnet (MM) cartridges with onboard
regulated supply, with external unregulated DC supply.
This design is an all-FET Class
A power amplifier, inspired by the 1969 Linsley Hood Amplifier (The JLH
amplifier) and the newer Nelson Pass PLH amplifier.
This is an audio non-feedback class A
amplifier, divided into two parts: 1) A Buffer Amplifier working in
class A with a voltage gain of 0 dB, but with a very high current gain,
and 2) A Voltage Amplifier also working in class A, with a high voltage
gain and a low output impedance. It is also possible to use this
amplifier as a headphone amplifier or an ordinary preamplifier.
This is a general desription of the differential
operational amplifier and the current feedback amplifier.
This is a general description of RIAA phono equalising.
This article is discussing audio power amplifiers,
the advantages of class A amplifiers compared to class B and A/B.
This is an old design of a 'current feedback' power amplifiers.