Hifisonix X-Altra Mini II Line Preamplifier with Remote Control
in Preamplifiers
Originally published in January 2022. The Remote Control board optionally replaces the manual select control board to provide full remote control functionality on the preamplifier. The remote control board has a H-bridge output to drive a motorised ALPS RK27 or RK16 20K log taper potentiometer (5V at 100 mA) and is short circuit proof. Further, […]
Hifisonix High Performance Balanced Line Stage
in Preamplifiers
You can buy a stereo PCB for this line stage over in the Shop. This OPA1641 and OPA1642 opamp based stereo line stage, which is used in the X-Altra Mini II full feature line level preamplifier, offers a balanced output for the left and right channels and 2 unbalanced outputs each for the left and […]
Hifisonix X-Altra Mini II Discrete Line Stage
in Preamplifiers
This is the discrete line stage used in the X-Altra Mini II line level preamplifier discussed in detail elsewhere on this website. The presentation linked to above discusses the design and presents the measurements of just the discrete line level amplifier. This is a paired down, simple design that nevertheless offers excellent measured performance and […]
Hifisonix Standard PSU
in Power supplies, Preamplifiers
You can buy a PCB for this power supply over in the Shop. If you are building a headphone amplifier, you can also buy a Standard PSU + HPA-1 Class A Headphone Amplifier PCB bundle in the Shop. Here is a low noise general purpose linear power supply that can be used to power the […]