How can I implement the D1-Stage with an Ultra-Analog-DAC (parasound 2000)? - Page 3 - diyAudio
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Old 6th January 2004, 11:28 AM   #21
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In my experience the sound varies especially as well for different Idss of the different devices. So, a 389 GR sounds quite different than a BL or a V (at a given bias).
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Old 6th January 2004, 11:32 AM   #22
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Default Filter Response ?

What is the frequency response of the I/V stage from the D1?
I will be using upsampled data and want the filter to be above 48Khz.
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Old 6th January 2004, 01:29 PM   #23
Klaus is offline Klaus  Germany
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Default Re: Filter Response ?

Quote:
Originally posted by promitheus
What is the frequency response of the I/V stage from the D1?
I will be using upsampled data and want the filter to be above 48Khz.

Pass D1 uses 1,5k parallel to 2,7nF = 40,5kHz f_o for the 2mA PCM63. So 3V peak per branch.

I use 6,5k and 680pF = 44kHz f_o for my TDA1547 just giving 0,1mA. Just 0,65V - so 1,3V on XLR. Enough for no use of the volume adjuster of the D1.

Simply calculate your values for your DAC used.
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Old 6th January 2004, 05:46 PM   #24
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Thatīs how much I calculated last time so I wasnīt wrong.
I am planing on designing a PCB for the I/V stage. I want to replace the 4 opamps in my DAC to this.
Is anybody interested?
I want to use silver mica for the small caps.
Panasonic FC for the electrolytics.
I probably will use 4,7 uF MKP caps for the output.
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Old 8th January 2004, 07:40 AM   #25
Klaus is offline Klaus  Germany
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Default the schematic

Quote:
Originally posted by Klaus



More to follow but for the curious guys already some pics... (sorry in another forum in German language) http://www.audiomap.de/forum/index.p...id=15097&page=

regards

Klaus

Hi,

I put "my" schematic - it is more a schematic of the one and only, because I just combined P1.7 and D1 circuits – online http://www.audiomap.de/forum/index.p...id=15147&page= . Sorry, but again in German language and in another forum. I have problems to put my stuff into here (donīt know why), so I refer to the other forum which offers somewhat easier data download.

The key massage: find your own bias current! The sound is changing really radical from 3mA up to 10mA through the 2SK389. Also the DAC current will for sure change the best current value. Put one trimming resistor 150Ohm plus 63Ohm in line in for R2 and adjust the bias current. Then set R1 to U_b/2 and listen…

Test it, the sound is perfect!!!!!!!!!!!!!!!!!!!!!! Pics of my hardcore P2P work under the link in the quoted words above.

Regards

Klaus
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Old 12th January 2004, 08:31 AM   #26
Klaus is offline Klaus  Germany
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Default test: pic attachment

If no pic is seen I have no idea what Iīm doing wrong...

D:\Witte privat\Fotos HiFi\D1-Stufe1r.JPG
Attached Images
File Type: jpg d1-stufe1r.jpg (40.7 KB, 1223 views)
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Old 12th January 2004, 08:39 AM   #27
Klaus is offline Klaus  Germany
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Default it works again!

Our system admin maybe has changed again the security settings, now it works again. Nice!

The pic shows the mini sized D1 clone I/U + buffer stage. Fully symmetrical (4 "channels") and two voltage regs a la P1.7 in the middle. The 610/9610 lock somewhat pressed in, because I originally layouted for smaller FETs. The sound is unbelievable nice. I trust in Nelsons circuits and just copy them.

Hopefully the other day a nice, small PCB would be available for this stage. Small to bring it into given packaging situations. By adjusteing two Rīs and the filter cap it can easily by adapted to each DAC with symmetrical current output.

Regards

Klaus
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Old 12th January 2004, 09:28 AM   #28
Cobra2 is offline Cobra2  Norway
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Great work, I knew the TDA1547 could perform...
-waiting for the PCB...

Arne K
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Old 12th January 2004, 10:51 PM   #29
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Looks indeed great, I would be with the pcb as well.
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Old 24th April 2004, 12:47 AM   #30
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Don't wait for the PCB

DIY !
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