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le shéma à l'air plutôt bien fait avec alimentations par voies séparées
le shéma
Hi-End WM8740 X2 MONO DIR9001 PCM2706 DAC DIY KIT
Ti DIR9001 receiver & WM8740 DAC chip & PCM2706 USB decoder DAC kit for DIY,Unassembled
3 Separate DC rectifing for analog circuit and digital circuit
2pcs of WM8740 work on MONO mode,Have a disinctively ware and mellow sound,Deeper bass
USB & coaxial input,Burr-Brown PCM2706 output I2S stream to DAC chip
Better sound than integrated sound card of laptop&PC,Even better than many dedicate sound cards wich above $100USD
This mini USB DAC kit is base on WM8740 DAC processor,Ti DIR9001 digital receiver and PCM2706 USB decoder,WM8740 is one of the best DAC processor perform 24bit/192K singnal process ability, The 2pcs of WM8740 work on MONO mode to make amazing sound,This kit made with high quality components like ELNA capacitor/PHILIPS capacitor/high precision resistance/SANKEN rectifier diode...
WM8740 is a well know DAC chip with its blance sound and used in many High-END CD players such as Cambridge Audio AZUR 650 and Rega Apollo CD player...
Specifications
# Based on PCM2706 USB decoder from Texas Instruments and DIR9001 digital receiver and WM8740(mono).
# WM8740 parameter:
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120dB SNR (’A’ weighted, mono @ 48kHz)
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117dB SNR (’A’ weighted, stereo @ 48kHz)
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104dB THD (’A’ weighted @ 48kHz)
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Sampling frequency : 8kHz - 192kHz
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Input data word : 16 to 24-bit
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Selectable digital low pass filter
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Optional interface to industry standard external filters
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Hardware or 3-wire SPI control
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Fully dfferential voltage outputs
# 3 ways separate rectifier for analog circuit and digital circuit
# Good quality compents such as ELNA capacitor/PHILIPS capacitor/high precision resistance/SANKEN rectifier diode
# Gold cated RCA output connector.
# Use TI NE5534 op,You could upgrade it with OPA604/AD797/OPA627 etc.
# Size: 120mm by 99mm
# Powe supply: One group AC 15V-0-15V, Two group AC 8V-10V ( one group is still OK,there is a joint poin on the PCB board)
90€ FDP in
+ 25 usd pour le R-core qui va bien (c'est très raisonnable)
108€ pour le tout...