New Hifisonix kx-Amplifier: Preview
In the next few weeks, the new Hifisonix class A amplifier, the kx-Amp, will be completed and the write-up and PCB Gerbers (DSTHP) made available for DIY’ers. A commercial version, loosely based o the kx-amplifier design but with some added…
Very Simple, Accurate RIAA Phono EQ Amp
Here is a simple no-nonsense RIAA amp you can easily build. The design uses an all-active topology and is based around an NE5534A low noise opamp. I make no claims for originality but you wont find any voodoo engineering, fairy…
An Accurate Inverse RIAA Network
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…
Ground Loops: How to Wire-up an Audio Amplifier for Zero Hum and Noise
This set of slides is the culmination of my experience over a period of about 25 years building numerous power amplifiers and preamplifiers. When I first started out in audio about 40 years ago as a teenager, some of my…
JLH 10 Watt Class A Amplifier
This is a copy of the original John Linsley-Hood article that appeared in Wireless World in 1969. This design, almost 50 years old, is still built in its hundreds all over the world. A quick root around on the web…
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