Amplifier daughterboard for HP MoBo modular headphone amplifier
- High-power high-performance balanced headphone amplifier daughterboard for HP MoBo
- Balanced input, balanced output
- Jumper link for two gain options, default 0/10 dB
- Jumper link for two output impedance options
- OPA2134 opamps followed by BUF634 or LME49600 buffers
- SNR: 113-121 dB A-w depending on the buffer, load, and gain
- THD+N ratio at 100 mW (LME49600)
- 300 Ω: 0.0004 % / -108 dB
- 32 Ω: 0.0007 % / -103 dB
- 16 Ω: 0.0012 % / -98 dB
- Max power around 1 W (<0.1 % THD+N)
- Update: get even higher performance with LM4562 opamps
