hifisonix

Month: July 2021

  • Hifisonix Standard PSU

    Click here to buy a PCB for the Standard PSU Click here for the build documentation Click here for the BOM The Hifisonix Standard PSU features low noise, up to 400mA per rail output current, a MUTE relay driver to ensure when the load powers up or down there are no clicks or thumps, a…

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  • Hifisonix HPA-1 Class A Headphone Amplifier

    The circuit combines a dual ultra-low distortion opamp, the LM4562 or OPA1642, with a class A discrete power output stage to deliver outstanding performance both measured, and sonically. The complete amplifier, including the opamps, runs in class A. Into 60 Ohm headphones and above, the HPA-1 remains fully in class A up to the rated…

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  • Hifisonix 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 cartridge output rises at 20 dB/decade if the record groove is cut at constant amplitude.…

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