S.houBed DAC 132db Dual MONO pcm1794 - Page 3 - diyAudio
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Old 30th November 2012, 08:53 AM   #21
xslavic is offline xslavic  Moldova
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THATS all
next version 1.1 thinking to add a tpa6120 Headphone amp with JFET buffer for full V swing of your superlux headphones
or mine
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Old 30th November 2012, 09:26 AM   #22
xslavic is offline xslavic  Moldova
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Bottom pcm1794 with pin1pin2 soldered together
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Old 10th December 2012, 10:23 AM   #23
xslavic is offline xslavic  Moldova
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ATTention ,important note pin 3 and 5 of the opamps are connected together -connect them to ground
also as you see voltage is set for +-12 so its 24V total
you can lower it
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Old 13th December 2012, 10:57 AM   #24
xslavic is offline xslavic  Moldova
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replace 8k on top of CS8421 with 2k
you need to switch off only crystal to bypass upscaller but you need to install crystall correctly as From datasheet of it
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Old 14th December 2012, 12:32 PM   #25
xslavic is offline xslavic  Moldova
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The resistor above gives the oversampling multiplier,however you can make it a NOS DAC or NON oversampling dac by connecting the pcm1794 's SCK and BCK it can produce a non audible delay between channells butsound is better and can be corrected increasing one of the 2 resistors to BCK (sck ones shoud be removed)
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Old 22nd December 2012, 01:44 PM   #26
xslavic is offline xslavic  Moldova
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Default another way of connecting pcm1794

just dont connect sck and bck if you want no delay
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Old 31st December 2012, 07:43 AM   #27
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Location: Belfast
Are you selling these on Ebay?

DAC Dual Mono PCM1794 Kit DIY PCB 192kHz 24 32 Bit WM8805 24bit CS8421 | eBay
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Old 20th February 2013, 12:26 PM   #28
focal7C is offline focal7C  Australia
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Default I2S feed?

Is the WM8805 configured to be USB to I2S out - directly feeding the PCM1794?
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Old 20th February 2013, 03:09 PM   #29
xslavic is offline xslavic  Moldova
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YES,if cs8421 then you can use even cm6631 32bit usb board
check schematics for resistor to bypass it,to use only wm8805 out format
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Old 20th February 2013, 03:12 PM   #30
xslavic is offline xslavic  Moldova
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New boards on the way
V1.1 cs8421 wm8805 pcm1794 ,smaller pcb,better circuit,RED colour pcb
TPA6120 or TPA6120A2 headphone amplifier,improved dynamic range by decreasing load on I/V opamp, SMD HPF decoupling cap at the out of pcm1794-rest all hole mount components,leds for every stage of the DAC ,multiple connectivity options + analog switches
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