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TPA6120A2

Modular HP AmpObsolete

HP TPA – Simple IC amplifier board for HP MoBo

by nihtila
written by nihtila

Amplifier daughterboard for HP MoBo modular headphone amplifier

  • TPA6120A2-based simple-IC headphone amplifier amplifier
  • Balanced input, balanced output
  • Jumper link for extra gain option; default 0/10 dB
  • SNR: 116-122 dB A-w depending on the gain and load combination
  • THD+N ratio at 100 mW
    • 300 Ω: 0.0015 % / -96 dB
    • 32 Ω: 0.006 % / -84 dB
    • 16 Ω: 0.009 % / -81 dB
  • Max power around 0.5 W (16 / 32 Ω)
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H-DACObsolete

Addon H-PreAmp – Preamplifier/headphone amplifier addon for H-DAC

by nihtila
written by nihtila
  • Very high performance preamplifier; measurement results with H-DAC and 2 Vrms output:
    • Dynamic range / SNR: 116 dB (A-weighted)
    • THD+N ratio: -102 dB (2.0 Vrms / 1 kHz, 48 kHz sample rate)
    • Crosstalk at 10 kHz: -113 dB
  • Very high performance headphone amplifier
    • Dynamic range / SNR: 115 dB (A-weighted)
    • Maximum output power / THD+N ratio:
      • 22 mW / -98 dB into 560 ohms
      • 230 mW / -85 dB into 33 ohms
      • More gain can be added for higher output power
  • Software controlled (Arduino compatible)
  • Balanced outputs (XLR) on-board and unbalanced connectors (RCA) on H-DAC board
  • Takes supplies and audio signals directly from H-DAC via pinheaders
  • 10×10 cm 4-layer PCB shaped to fit tall components on H-DAC board; PGA4311 volume control, LM49724 and LM4562 opamps (or any with the same pinouts), TPA6120A2 headphone amplifier, optional THAT1606 balanced drivers

H-PreAmp is an addon board for H-DAC, transforming the fixed-output DAC into a very high quality preamplifier with integrated headphone amplifier. H-DAC and H-PreAmp together provide single-ended (RCA) and balanced (XLR) outputs as well as headphone amplifier.

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