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RIAA Equalizer Amplifier Design

RIAA Equalizer Amplifier Design

July 22, 2018 · by Bonsai · in Audio Design Library

This article explores the intracacies of phono amplifier design,  culminating in a few practical designs. Special emphasis is placed on overload margins (critical if you want good sonics from your EQ amp), driving the EQ network adequately and noise. RIAA Equalization…

Ground Loops

Ground Loops

July 15, 2018 · by Bonsai · in Amplifiers, Audio Design Library

Updated with new material 7th January 2019 This set of c. 50 slides is the culmination of my experience over a period of about 25 years building numerous power amplifiers and preamplifiers. I first started out in audio around 1975…

kx-amplifier: A very high performance 28 Watt class A Current Feedback Amplifier

kx-amplifier: A very high performance 28 Watt class A Current Feedback Amplifier

March 16, 2018 · by Bonsai · in Amplifiers, Power Amplifiers

The Hifisonix kx-Amplifier is a 28 Watt class A DIY Current Feedback (CFA) power amplifier featuring low distortion, wide bandwidth and fast rise/fall times.  It can be operated either in pure class A mode, or in class AAB mode with…

An Accurate Inverse RIAA Network

An Accurate Inverse RIAA Network

December 14, 2017 · by Bonsai · in Pre Amplifiers

The diagram above summarizes the interaction of the cutting head response (purple) and the playback EQ (red) which produces the final flat response (green). Note that the cutting head and the phono pickup (cartridge) are velocity transducers and therefore the…

Feedback: A Short History

Feedback: A Short History

October 27, 2017 · by Bonsai · in Useful Audio Links

“Why, sometimes I’ve believed as many as six impossible things before breakfast.” ― Lewis Carroll, Alice in Wonderland     A Future Without Feedback by Martin Colloms There is no mysticism in amplifier design, just serious science. —Andrey A. Danilov Introduction You…

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