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…
I published the original e-Amp design in 2012. I will release the PCB’s in the next few weeks along with a suitable non-microprocessor based protection PCB. The e-Amp is a VFA design that allows the user to change the type…
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…
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…
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…
Here is the new updated moving coil head amp designs compendium – updated 6 July 2019. The table below shows how the amplifier noise and the source resistance noise add. Select your amplifier equivalent noise resistance on the y axis,…
