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Audio Amplifier Design

X-Altra RIAA Phono EQ Preamp

X-Altra RIAA Phono EQ Preamp

February 17, 2020 · by Bonsai · in Useful Audio Links

The X-Altra MC/MM RIAA Phono EQ article Part 1 has been published in the February issue of audioXpress magazine (Part 2 will follow in March). Here is a link to the February issue overview and towards the bottom, a quick…

Hifisonix Audio Design and Engineering

Hifisonix Audio Design and Engineering

January 10, 2020 · by Bonsai · in Useful Audio Links

Are you are looking for an experienced solid state audio designer? I am UK based but can undertake design projects on a contract basis for customers anywhere in the world. I specialize in power amplifiers, full feature pre-amplifiers (including low…

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…

HPA-1 Class A Headphone Amplifier

HPA-1 Class A Headphone Amplifier

January 9, 2020 · by Bonsai · in Useful Audio Links

This class A headphone amplifier from 2014 is based on the design I used in my ‘Symphony’ preamp. It will drive a pair of 32 Ohm headphones to 6V pk-pk and remain in class A with < 330 parts per…

So Just How Quiet is Your Phono Stage?

So Just How Quiet is Your Phono Stage?

March 19, 2019 · by Bonsai · in Audio Design Library, Pre Amplifiers, Useful Audio Links

You may be in for a surprise: actually not that quiet! The reason of course is that the cartridge inductance and resistance dominate the noise in any decent phono amp. To get the best in terms of noise performance, you…

Fast Voltage Amplifier Stages for Audio Power Amplifiers

January 10, 2019 · by Bonsai · in Audio Design Library

Here is a quick look at some of the problems that can occur when the VAS (aka TIS) in an audio amplifier is driven into saturation without considering the effects of base charge storage – a phenomena all bipolar transistor…

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