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Addon BalOut

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Addon BalOut v2 – Balanced output board

by nihtila
written by nihtila
  • Simple balanced buffer with very high performance
  • Noise level: -117 dBV A-weighted (v2.0B)
  • THD+N ratio at 2 Vrms output signal: -119 dB (v2.0B)
  • Two versions can be populated:
    • v2.0A – traditional balanced output with inverted signal on cold lead
    • v2.0B – simplified output with ground on cold lead

Original Addon BalOut was designed for H-DAC but as there has been interest in those boards, this new version is easier to use in other applications:

  • No filter components
  • Normal opamps instead of fully differential opamp
  • Separete input signal pinheaders
  • Mounting holes
  • Reference designators on silk screen and cheaper 2-layer board
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Audio Measurements

LME49724 vs. OPA1632 in Addon BalOut

by nihtila
written by nihtila

Following performance figures have been measured in Addon BalOut module:

  • Both opamps are so good that it is difficult to measure differences directly.
  • LME49724:
    • Noise level: -117 dBV (A-weighted),
    • THD+N ratio: at least -109 dB (1 kHz, 2 Vrms), around measurement instrument limits.
  • OPA1632:
    • Noise level: -118 dBV (A-weighted),
    • THD+N level: at least -109 dB (1 kHz, 2 Vrms), around measurement instrument limits.
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