- Modular headphone amplifier based on HP MoBo motherboard and changeable amplifier daughterboards:
- Balanced input
- Balanced and unbalanced headphone output
- Output mute circuit
- Part of multi-component system with external power supply
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
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)
Motherboard for modular headphone amplifier system
- Motherboard with inputs, outputs, power distribution, and signal routing for amplifier daughterboard
- Balanced input
- Balanced and unbalanced outputs
- Output mute circuit
- Requires separate amplifier board
HP MoBo is the basis of a modular headphone amplifier design. It provides input and output connections and simple power supply components (external power supply required), and connections for stackable amplifier daughterboard.