Hifisonix X-Altra RIAA Phono EQ Preamp
in Vinyl preamp
This project was published in two parts in the influential US-based audio magazine ‘audioXpress’ in February and March 2021 (links to the download page below). About sixty of these preamps have been built as of May 2023. You can buy a set of X-Altra MC/MM preamplifier boards for $49.50 + $15 for shipping over in […]
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. […]
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 […]