Input and switch boards for Soekris DAM1021 DAC - diyAudio
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Old 17th February 2015, 03:28 PM   #1
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Join Date: Nov 2009
Location: Riga
Default Input and switch boards for Soekris DAM1021 DAC

This is a group buy for a set of input and switch boards for the Soekris DAM1021 DAC.

The wiki page contains latest updates for the design and build information.

At this time I have boards available. Please send me a PM with your paypal ID and specify which option you want (bare board/kit/assembled) and how many.

The current layout is described in post #97. The images attached to this post are obsolete.

Here is the BOM: DAM input board V1.1 BOM (Google sheets)

Pictures of a fully built board attached to DAM1012 are in post #127.

Connectivity
  • Directly connects to J3 and J2 headers on the DAC.
  • Directly connects to header on Amanero USB/I2S adapter.
  • Coaxial SPDIF input with BNC connector footprint.
  • Optical TOSLINK input with footprints for Toshiba TORX147L and Cliff Electronics ORJ-5 receivers.
  • U.FL sockets for other I2S sources (can be installed, but not used simultaneously with Amanero).
  • Optional U.FL sockets for Amanero MCLK OUT, I2S MCLK OUT, FPGA SLV and FPGA MCLK OUT lines.
  • Available connections to ALL pins on DAM1021 J2 and J3, and Amanero headers.

Description

The physical dimensions allow to fit the DAM1021 DAC with the input board, TOSLINK, BNC COAX and Amanero USB interfaces attached into a 1U (40mm height) case with minimum internal depth of 220 mm.

All SMD resistors, capacitors and LEDs are 0805 size.

The SPDIF transformer pads have 10x5 mm footprint, they fit Murata DA101C or Pulse Electronics PE-65612NL transformers.

The input board contains schottky diodes to allow use of a single pole switch for input selection. See the schematic for alternative connections for details.

The front panel board accepts Lorlin CK series switches, such as CK1051 or CK1061. Input selector and power LEDs can be soldered directly on the board, or 2 pin headers can be mounted in place of LEDs to allow different LED placement.

The board is powered from DAM1021 J2 header. It uses PWR +1.2V line to reference the SPDIF differential input, and PWR A+ line as input to 3.3V regulator. The 3.3V regulator powers the TOSLINK receiver, front panel LEDs, and is used for volume pot 3.3V reference.

The alternative connection schematic shows how to connect volume pot, power led and single pole input selector switch directly to the "front panel" header.

Pricing

The boards are available only as a set.

One set of bare boards is 13 EUR.

A kit of SMD parts (resistors, capacitors, LEDs, voltage regulator IC and U.FL sockets) is 6 EUR. No other connectors or through hole components included.

A set of boards with preassembled SMD components (resistors, capacitors, LEDs, voltage regulator IC and three U.FL sockets for I2S) is 35 EUR. No other connectors or through hole components included. Pictures of assembled test boards are in post #98.

Shipping and handling 5 EUR by regular mail to anywhere in the world.

1 EUR for each set sold will be donated to diyAudio forum.

Payment by Paypal only.
Attached Images
File Type: png dam1021-input-board-v1.0-sch.png (39.3 KB, 1425 views)
File Type: png dam1021-input-board-v1.0-brd.png (45.8 KB, 1393 views)
File Type: png dam1021-frontpanel-v1.0-sch.png (19.5 KB, 1367 views)
File Type: png dam1021-frontpanel-v1.0-brd.png (16.0 KB, 1374 views)
File Type: png dam1021-input-board-alternative-connections.png (15.3 KB, 1344 views)

Last edited by normundss; 2nd April 2015 at 12:08 PM. Reason: Added wiki link
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Old 17th February 2015, 03:45 PM   #2
leehan is offline leehan  United Kingdom
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Join Date: Jun 2010
Location: Kent, UK
1 assembled board.

Thanks.
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Old 17th February 2015, 04:08 PM   #3
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Join Date: May 2002
Location: Madison, WI
leehan: 1 assembled board
tubesguy: 1 assembled board
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Old 17th February 2015, 04:16 PM   #4
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Join Date: Apr 2012
1 assembled board.
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Old 17th February 2015, 04:20 PM   #5
secanbj is offline secanbj  Sweden
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Join Date: Sep 2003
Location: Gothenburg
one assembled set
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Old 17th February 2015, 04:21 PM   #6
RollE2k is offline RollE2k  Sweden
diyAudio Member
 
Join Date: Nov 2007
leehan: 1 assembled board
tubesguy: 1 assembled board
robertrowett: 1 assembled board
secanbj: 1 assembled board
RollE2k: 1 set bare boards + 1 set smd components
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Old 17th February 2015, 04:28 PM   #7
Can you say Audio?
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Join Date: Aug 2011
Location: Aurora, Colorado
leehan: 1 assembled board
tubesguy: 1 assembled board
robertrowett: 1 assembled board
secanbj: 1 assembled board
RollE2k: 1 set bare boards + 1 set smd components
misterrogers: 1 assembled board
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Old 17th February 2015, 04:33 PM   #8
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Join Date: Feb 2003
Location: West Coast of Norway
leehan: 1 assembled board
tubesguy: 1 assembled board
robertrowett: 1 assembled board
secanbj: 1 assembled board
RollE2k: 1 set bare boards + 1 set smd components
misterrogers: 1 assembled board
bambadoo: 1 assembled board
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Old 17th February 2015, 04:35 PM   #9
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Join Date: Jan 2003
Location: LA
leehan: 1 assembled board
tubesguy: 1 assembled board
robertrowett: 1 assembled board
secanbj: 1 assembled board
RollE2k: 1 set bare boards + 1 set smd components
misterrogers: 1 assembled board
bambadoo: 1 assembled board
randytsuch: 2 bare boards
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Old 17th February 2015, 04:40 PM   #10
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Join Date: Jun 2005
Location: Lierde
leehan: 1 assembled board
tubesguy: 1 assembled board
robertrowett: 1 assembled board
secanbj: 1 assembled board
RollE2k: 1 set bare boards + 1 set smd components
misterrogers: 1 assembled board
bambadoo: 1 assembled board
randytsuch: 2 bare boards
danny_66: 1 assembled board
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