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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 KHz

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N

nige2000

Member
Joined 2013
can anyone enlighten me to what this resistors are for
22243018132_cbe044bd59_z.jpg
 
N

normundss

Member
Joined 2009
For anyone who might be interested, the group buy for DAM1021 input, switch and muting/output boards is now open. For details of the boards please see the first post of the GB thread and the preliminary documentation.

Please sign up on the GB spreadsheet and send me your Paypal ID by PM for invoicing.
This GB round is open until Nov 1st, 2015. All orders paid by this date will receive a 10% discount from the listed prices. Boards will still be available for purchase after Nov 1st at full price.
 
A

arf

Member
Joined 2006
nige2000 said:
thanks

i sort of understand
what value resistors did you replace with?
how did find the correct values was just trail and error?
how much improvement was there?
can we bypass the lpf ?
Click to expand...

Same as original ones 13R / 0.01. I do believe these two resistors are in MSB chain (like it is 100R in attached diagram of 8bit DAC)
Speed and uMicro details are vastly improved.
Taking out capacitor will basically disable LPF (no lpf).
Søren have done this, way back (se post #143 and #144 on page 15) when he was testing speed of DAM. It is good idea to ground lifted pin 3 of "LME49710 buffers " .


cheers
Danny
 

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N

nige2000

Member
Joined 2013
arf said:
Same as original ones 13R / 0.01. I do believe these two resistors are in MSB chain (like it is 100R in attached diagram of 8bit DAC)
Speed and uMicro details are vastly improved.
Taking out capacitor will basically disable LPF (no lpf).
Søren have done this, way back (se post #143 and #144 on page 15) when he was testing speed of DAM. It is good idea to ground lifted pin 3 of "LME49710 buffers " .


cheers
Danny
Click to expand...
i had thought the 13rs were after the msb chain and would be a worthy experiment to short across them and remove the cap
 
N

normundss

Member
Joined 2009
geovar said:
Hi all
As you can see in the first image with Windows7 and ExtraPutty, "filters" and "filters all" is working good.
In the second image MacBookPro and FastSpring.com program, typing
"filters all" it's ok, no result typing "filters"
Any idea??
View attachment 509521

View attachment 509522
Click to expand...

"filters" command lists only the currently active filters. In the second image DAM1021 is not locked to a signal (no LXXX output), therefore no filters are active and it displays an empty list.
 
H

hannesie

Member
Joined 2007
AVMN.nl
AndrewCee said:
Intersting, I've still a V1 board and with the latest firmware am finding it often will not lock. Select a track, I hear about 1/4 second sound, then nothing. Seems to happen more with the higher sample rates...?? Most annoying!
Click to expand...
Maybe an other streamer, or app?
I am using here Vortexbox for a long time, and don't recognize this.
Also with the V1 version.
 
N

nkalogridis

Member
Joined 2011
geovar said:
Thank you normundss, but I can’t understand why this happens.
I mean that why with the PC, DAM locks “filters”command and with the Mac is not locking? Is a question of settings in the FastSpring.com program ?
Click to expand...

By locking he means audio signal locking (i.e. the DAC has locked to an audio stream and plays music)

The filters command shows the currently used filters by the DAC but if no sound is playing (i.e. the DAC lock led is blinking) then no filters are used.
 
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