Ovation e-Amp: A 180 Watt Class AB VFA Featuring Ultra Low Distortion
The e-Amp is a 180 Watt RMS (very conservatively rated into 8 Ω ) fully balanced symmetrical (‘FBS’) amplifier featuring an emitter follower triple (EFT) bipolar output stage and beta enhanced VAS stage. The amplifier can be configured using jumpers…
Augmented Feedback Error Correction (AFEC)
AFEC is a simple technique that augments the feedback of a low OLG CFA topology amplifier to dramatically improve the Large Signal Non-linearity (LSN) distortion performance by up to 20 dB across the audio band. Additionally, AFEC acts to remove…
RIAA Equalizer Amplifier Design
This article explores the intracacies of phono amplifier design, culminating in a few practical designs, tailored to suit everyones budget and hopefully ears. RIAA Equalization Amplifiers V2.0 Below is the RIAA Calculator Excel spread sheet. Please read the article above, before attempting…
Tom D Kite Busts Some Audio Myths!
Ever wondered how we got to ‘feedback is bad’, ‘ . . . sampling destroys the music’ or ‘ . . . analog is 40 bits resolution . . .’ , ‘we need damping factors of 1000’ and ‘ ….
Peter Walker’s ‘Current Dumping’ Amplifier from 1975
The famous Quad ‘Current Dumping’ amplifier launched in the mid 1970’s, and featured feed forward error correction that effectively removed the class B cross over distortion that plagues this type of output circuit structure. The design featured no adjustments in…
