Hifisonix X-Altra HPA-1 Class A Headphone Amplifier
in Headphone amplifiers
You can buy PCB’s for the HPA-1 Headphone Amplifier over in the Shop. There is also a Standard PSU+HPA-1 bundle option as well in the Shop. The HPA-1 is a compact, very high performance class A headphone amplifier that will deliver up to 1.75W into a 32 Ohm pair of headphones. The amplifier features ultra-low […]
Hifisonix Accurate Inverse RIAA Network
in Vinyl preamp
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 cartridge output rises at 20 dB/decade if the record groove is cut at constant amplitude. […]
Hifisonix Ripple Eater PSU for the sx and kx-Amplifiers
in Power amplifiers, Power supplies
The PCB’s are through hole plated and silk screened for just $11.99 (excl. shipping) and are available from Jim’s Audio here: Ripple Eater PSU for kx and sx Amplifiers (please note these PCB’s are not available from the Hifisonix Shop) Here is an Excel file with the BOM: Ripple Eater PSU BOM The BOM is […]
Very Simple, Accurate RIAA Phono EQ Amp
in Vinyl preamp
Very High Quality Silk Screened PCB’s for this project are available from Jim’s Audio here:- Hifisonix RIAA Amplifier Here is a simple no-nonsense, accurate RIAA equalizer 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 […]