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Month: December 2022
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Hifisonix kx2 Class A Current Feedback Amplifier
The 15W RMS (28W peak class A) kx2-Amplifier offers outstanding noise and distortion performance and is specifically designed for driving high efficiency speakers in average to large listening spaces but also performs well driving more normal efficiency speakers in restricted listening spaces. Click Here for the kx2-Amplifier Build Document Click Here for the kx2-Amplifier BOM…
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Hifisonix X-Altra MC/MM RIAA Phono EQ Preamp
The X-Altra MC/MM phono preamp, whether bought as a completed unit or DIY built, delivers the ultimate performance with respect to noise, overload, and RIAA conformance, placing it among the very best available anywhere at any price. In 2021, the design was featured in audioXpress, a leading audio industry publication based in the US. Part…
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Hifisonix nx-Amplifier: A High Performance 100 W Class AB Current Feedback Amplifier
Originally published in December 2012. This power amp design is based on the sx-Amplifier topology, but with the TIS and output stage re-configured for class AB operation, enabling it to deliver 100 W into 8 Ohms. I have kept the design very simple, retaining the CFA topology, providing a very wide -3 dB bandwidth of…
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Hifisonix sx-Amplifier: A 15 W Class A Current Feedback Amplifier
Originally published in August 2012. Click here to order a set of DS THP PCBs for the sx-Amplifier from Jim’s Audio About 150 sx-Amplifier PCB sets have been sold, with most of those going on to be built. As you can read about in the PDF below, my class A journey started off after listening…