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Old 14th November 2013, 04:09 AM   #741
AR2 is offline AR2  United States
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Quote:
Originally Posted by rsotirov View Post
Dear Acko,

Where can I buy U.fl to W.fl coax cables. Today I found out the hard way....

Trying to connect Ian's clock board to your dac AKD12P.

After an hour googling I gave up.

Thank you,

Roumen Sotirov
Roumen,

I mounted W.FL connectors in the place of U.FL and it works quite fine on several boards. Sure it is sensitive, but I was careful to limit how often I connect and disconnect. Also I purchased W.FL tool for handling those cables and connectors, for what I strongly believe is a must. With U.FL you could be without but not with W.FL. As for the mounting connectors, if you never did work with SMD parts, do not make this as your first project. The main difficulty is soldering ground on both sides, yet having connector perfectly centered without applying solder to the outside ground ring. In case that happens, you would not be able to connect cable to it.
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Old 14th November 2013, 05:20 AM   #742
acko is offline acko  Australia
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Both U.FL and w.fl connectors need careful attention when connecting or disconnecting. Best to plan assembly carefully and connect up just once only especially if you do not have any extraction tools. They are not meant for experiments. For example, when I make the full Combo DACs, and if I have to remove a connection, the cable assembly is discarded for a new one to maintain the build quality.
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Last edited by acko; 14th November 2013 at 05:23 AM.
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Old 14th November 2013, 11:11 AM   #743
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Thank you Acko and AR2,

I will place an order with Mouser for the connectors and the tool.

Roumen
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Old 14th November 2013, 11:22 AM   #744
RollE2k is offline RollE2k  Sweden
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acko: Sorry for offtopic here - but do you know of any 75ohm mini-coax plug like the u.fl (which is 50ohm)?
I'm asking because it would be great for spdif. i know there are 50ohm BNC to u.fl cables - and i would like something like that for my DAC.

Also, if you integrate volume on the DAC board, make it to work with a Pot rather than rotary encoder, for us who don't want to use a display :-)
(i'm planing on using it in a tube headphone amp, and only would like to use USB input).

Last edited by RollE2k; 14th November 2013 at 11:31 AM.
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Old 16th November 2013, 09:04 AM   #745
acko is offline acko  Australia
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Quote:
Originally Posted by RollE2k View Post
acko: Sorry for offtopic here - but do you know of any 75ohm mini-coax plug like the u.fl (which is 50ohm)?
I'm asking because it would be great for spdif. i know there are 50ohm BNC to u.fl cables - and i would like something like that for my DAC.
Not sure what you are trying to do but Coax spdif (75ohms) signals cannot be connected directly to DAC. Its signal levels are not compatible and voltage swings from the transmission line effect may damage the DAC. It has to be conditioned with matching 75ohm termination and translated to TTL spdif before going to DAC inputs. This is what a typical spdif receiver does and the ttl spdif output is usually at 50ohm impedance so a 50ohm UFL cable connection suits nicely.


Quote:
Originally Posted by RollE2k View Post
Also, if you integrate volume on the DAC board, make it to work with a Pot rather than rotary encoder, for us who don't want to use a display :-)
(i'm planing on using it in a tube headphone amp, and only would like to use USB input).
It has always been with a linear pot. Where did you come across a rotary encoder for Pot?
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Old 23rd November 2013, 04:36 AM   #746
acko is offline acko  Australia
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Originally Posted by acko View Post
There has been some updates to this 9016 DAC board. New version has inputs re-mapped for stereo I2S/DSD and 2CH Spdif (TTL). Board layout has been further improved and now with U.FL coax for direct connection to popular transports. Available as bare boards and chip mounted options.
Matching IV boards are now available
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Old 23rd November 2013, 09:21 AM   #747
RollE2k is offline RollE2k  Sweden
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Acko: i did myself find MCX are good for 75ohm, but not as small as u.fl and why i need them are for BNC from the case to the PCB where i will have MCX mounted. Now i just need something so switch SPDIF with, maybe a WM8805 or so. Otherwise my buffalo 3 does take both TTL and 75ohm spdif directly into the dac.

But i was thinking maybe building your new ES9018K2M for my headphone amp :-)
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Old 24th November 2013, 09:56 PM   #748
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Originally Posted by acko View Post
There are no LDOs on board now.

Power requirements for the DAC side are:
Analog supplies: AVCC L/R = 3.3V (possibly up to 3.6V for increased headroom)
Digital core: DVDD = 1.2V
Digital logic: DVCC T/B = 3.3V
Did anyone reach any conclusions/opinions, concerning the optimal voltage on AVCC ??
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Old 24th December 2013, 05:58 AM   #749
acko is offline acko  Australia
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Quote:
Originally Posted by RollE2k View Post
Acko: i did myself find MCX are good for 75ohm, but not as small as u.fl and why i need them are for BNC from the case to the PCB where i will have MCX mounted. Now i just need something so switch SPDIF with, maybe a WM8805 or so. Otherwise my buffalo 3 does take both TTL and 75ohm spdif directly into the dac.
This should work fine. The BIII has spdif interface on board so no problems connecting spdif signals directly

Quote:
Originally Posted by RollE2k View Post
But i was thinking maybe building your new ES9018K2M for my headphone amp :-
This will be great but hope you can wait a little longer for the design to be completed, possibly Feb2014
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Old 24th December 2013, 08:43 AM   #750
TNT is offline TNT  Sweden
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Acko - as Your product has given me so many hours of music pleasure I would like to officially wish you a Merry Christmas :-)

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