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balanced

Wee DAC

Wee DAC addons – XLR output and extra S/PDIF inputs

by nihtila November 5, 2019

written by nihtila

There are several addon boards for Wee DAC to expand feature set:

W-Output XLR – Balanced XLR output for W-DAC
W-Output XLR Mute – Balanced XLR output with Mute relay for W-DAC
W-Input+ Combo – Extra Coaxial and Toslink S/PDIF inputs for W-Input
W-Input+ Combo XLR – Extra AES/EBU XLR and Toslink S/PDIF inputs for W-Input
W-Input+ Combo BNC – Extra AES/EBU XLR and BNC S/PDIF inputs for W-Input

November 5, 2019 3 comments

HP TPA – Simple IC amplifier board for HP MoBo

by nihtila February 4, 2018

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)

February 4, 2018 0 comment

H-DAC Obsolete

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

by nihtila January 25, 2017

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.

January 25, 2017 2 comments

H-DAC Obsolete

H-DAC – High performance 192 kHz / 24-bit DAC with addon options

by nihtila January 15, 2017

written by nihtila

Very high performance; measurement results with coaxial S/PDIF input:
- Output level: 2.0 Vrms
- Dynamic range / SNR: 122 dB (A-weighted)
- THD+N ratio: -103 dB (0 dBFS/1 kHz signal, 48 kHz sample rate)
- Crosstalk: -128 dB at 1 kHz, -112 dB at 10 kHz
Supports S/PDIF, Toslink, USB, and external I2S inputs
Unbalanced outputs (RCA) on board, balanced (XLR) addon available
Hardware-controlled – no need for microcontroller (but one can be added with addon)
Can be powered by AC or DC supply
Addon available to transform H-DAC into preamplifier/headphone amp
New output stage addons can be easily designed to experiment with components and circuits
CS8416 S/PDIF-receiver, PCM1794A DAC, LM4562 opamps (or any SO-8 dual opamp), PCM2707C USB-audio, LM2940/LM2990, TPS73633, TPS79133, and REG103 regulators

H-DAC is a high-performance 192 kHz / 24-bit capable DAC board with TI PCM1794A DAC. The board has two coaxial S/PDIF, two Toslink, and one I2S input that can be either on-board 48 kHz / 16-bit USB receiver or an external I2S-device. Input selection and settings are controlled with jumper links that can be replaced by mechanical switches or microcontroller addon board.

January 15, 2017 6 comments