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Building with the Soekris dam1121
Building with the Soekris dam1121
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Old 23rd August 2018, 03:41 PM   #471
Salas is online now Salas  Greece
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Building with the Soekris dam1121
Quote:
Originally Posted by janho12345 View Post
Almost finished,

Beagle one Black -> twisted pear audio hermes and Cronus -> dual mono dam1121 -> geometrical balanced transformer voltage control -> tube buffer (push pull and aikido cathode follower) -> output transformer
The cabling from the second UltraBiB to its load is long and thin. (The one placed low in the picture next to a tube socket). Use thicker wire it may prove subjectively audible to the better.
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Old 28th September 2018, 09:23 PM   #472
TNT is offline TNT  Sweden
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Is this what you have as factory delivered filters, or did I update mine?

dam1121 uManager Rev 1.08 20160523 FPGA Rev 1.08 Press ? for help.

# filters

04 EQHQ_lpbr_b1, 44.1 Khz, 0-19.00Khz +-0.00000005dB, 22.50Khz -174.26dB
08 EQHQ_lpbr_b0, 384.0 Khz, 0-30.00Khz +-0.00000005dB, 288.00Khz -174.16dB
29 DC Blocking IIR, 352.8 Ksps, 2 Hz HP 1st order
30 Deemphasis IIR, 352.8 Ksps, 50/15 uS

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Old 29th September 2018, 07:48 AM   #473
zfe is offline zfe
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It is one of Paul's from the mDf_EQHQ_variations... package.
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Old 15th October 2018, 03:09 PM   #474
janho12345 is offline janho12345  Germany
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Quote:
Originally Posted by wcwc View Post
janho,


Are you operating the Dam1121's Synchronously or Asynchronously?
One Board is Master the other one is slave. So I wired it as shown in the dam1121 manual with a buffer between master and slave board.


Quote:
Originally Posted by Salas View Post
The cabling from the second UltraBiB to its load is long and thin. (The one placed low in the picture next to a tube socket). Use thicker wire it may prove subjectively audible to the better.
Thanks Salas!


Being finished with my build, I can say using a Beaglehone Black with the Hermes Cronus combination from Twisted Pear audio was the right choice. Way better than a raspberry pi with reclocker. But there is no good documentation, so it took me really long to finish all this.

And I did have problems connecting the BBB serial with the Dam1121 for changing filter so instead there is a Arduino nano inside that sends signal to the dam1121 and lights a LED for showing which filter is active.
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