Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login
Direction of ribbon cable from BIII to S/PDIF-4
Options
View
Go to last post Go to first unread
Previous Topic Next Topic
bitinhvi  
#1 Posted : Wednesday, September 19, 2012 5:02:08 PM(UTC)
bitinhvi

Rank: Member

Groups: Member
Joined: 9/5/2012(UTC)
Posts: 59
Viet Nam
Location: Hanoi

Thanks: 5 times
Hi there!

I have a confusion about direction of 20pins ribbon cable from BIII to SPDIF4, the manual said that should pay attention on the dot and redwire of ribbon cable. However, I saw at least two working BIII image, pin 1 of ribbon cable on BIII and pin 1 of it on SPDIF4 was swapped.

Could anyone teach me which way is correct, should I connect in attached picture?


Beside, may I know function/operation of MUTE LED, LOCK LED. Normally, when open BIII, I got MUTE LED is ON.

Is this true that if I play (got SPDIF signal in), LOCK LED will be on and MUTE LED is off?

Thank you
bitinhvi attached the following image(s):
SPDIF ribbion 2.JPG (55kb) downloaded 47 time(s).

You cannot view/download attachments. Try to login or register.
Back to top

Wanna join the discussion?! Login to your Twisted Pear Audio Support forum accountor Register a new forum account.
Back to top  
SCompRacer  
#2 Posted : Thursday, September 20, 2012 3:44:52 AM(UTC)
SCompRacer

Rank: Member

Groups: Member
Joined: 1/6/2012(UTC)
Posts: 305
Location: Plainfield, IL

Thanks: 11 times
Was thanked: 26 time(s) in 21 post(s)
Hello!


Pin 1 on the DAC board is right above the Buffalo's head, so yes on the way you have it. (If your flat cable has the Red edge, just disconnect the cable and turn it around so you get into the habit of identifying pin 1 polarity). If the wiring were reversed, I don't think it would work as the outputs on the 4 channel S/PDIF board are pins 3-10 (output A, B, C and D, reference page 7 of Leon's excellent BIII integration guide).

http://www.twistedpearau...gration_Guide_V1.2.6.pdf

Not sure what would happen if the cable were reversed with power from the DAC board pins 19 and 20 (reference page 45 of the integration guide) going to the first two pins of the 4 channel S/PDIF board. Or possibly that was taken into consideration in the design so no short to GND would occur if the cable were reversed.

Yes on the mute light being on until the BIII locks on to a signal; then mute is off and lock led is lit. Music doesn't need to be playing for a lock light. My lock light illuminates with any source connected, like a SB Touch or CD player modded for I2S/DSD out.

This is how my single BIII was connected. Even though I used a Sidecar between the DAC and 4 channel board, pin one should match pin 1 from the DAC board all the way to the 4 channel input board.

UserPostedImage

Edited by user Thursday, September 20, 2012 3:59:56 AM(UTC)  | Reason: Not specified

Rich

http://www.twistedpearau...-Denon-DVD-3910-Mod.aspx
Back to top
thanks 1 user thanked SCompRacer for this useful post.
bitinhvi on 9/22/2012(UTC)
bitinhvi  
#3 Posted : Thursday, September 20, 2012 4:55:43 PM(UTC)
bitinhvi

Rank: Member

Groups: Member
Joined: 9/5/2012(UTC)
Posts: 59
Viet Nam
Location: Hanoi

Thanks: 5 times
Thank you for detail information, SCompRacer. Initially I know that I should follow manual from Leon, however, I have to twist the ribbon cable in order aligning pin 1 of BIII and pin 1 of SPDIF-4. Moreover, I saw at least 02 working DACs has reversed cable like that, so I am confuse.
Finally, when I align pin 1 on both board, voltage drop immediately from 5.2V to 2V, despite of I set CCS to 490mA and shunting current are more than 100mA. I don't know why I always face problem with voltage sag on this project.
Voltage are normal if I try to reversed the cable.

In order to speed up the process (I can not wait to hear the sound of this DAC), I want to by SPDIF board. Can I take SPDIF signal (Coaxial/Optical) directly to D1 pin on BIII board?

Beside, can I get SE output directly from BIII? if yes, which output on BIII should be connected to SE output stage? My Legato is having a problem so I temporarily use another output stage to test if BIII is working or not.

Thank you.

Back to top
Corpius  
#4 Posted : Thursday, September 20, 2012 7:42:11 PM(UTC)
Corpius

Rank: Member

Groups: Member
Joined: 2/1/2012(UTC)
Posts: 332
Location: The Netherlands

Thanks: 4 times
Was thanked: 18 time(s) in 18 post(s)
Originally Posted by: bitinhvi Go to Quoted Post
In order to speed up the process (I can not wait to hear the sound of this DAC), I want to by SPDIF board. Can I take SPDIF signal (Coaxial/Optical) directly to D1 pin on BIII board?
Optical, yes. Probably best to connect it directly to the BIII board.
Coaxial, no. Unless it is TTL level spdif, but it is probably not.



Originally Posted by: bitinhvi Go to Quoted Post
Beside, can I get SE output directly from BIII? if yes, which output on BIII should be connected to SE output stage? My Legato is having a problem so I temporarily use another output stage to test if BIII is working or not.

Thank you.
Should be the same as with the legato. See the integration guide for the output connections.


http://ce-designs.net/
Back to top
WWW
thanks 1 user thanked Corpius for this useful post.
bitinhvi on 9/22/2012(UTC)
bitinhvi  
#5 Posted : Saturday, September 22, 2012 4:16:07 AM(UTC)
bitinhvi

Rank: Member

Groups: Member
Joined: 9/5/2012(UTC)
Posts: 59
Viet Nam
Location: Hanoi

Thanks: 5 times
Update on 22 Sep.

Sad news, after follow advice from SCompRacer, I found that I misunderstood Pin 1 on BIII board. After soldering the connector, I could not see the dot on the Buffalo's head. Beside, after search some topic, I found that I carelessly swapped VDD and DVCC. Hope everything is fine after swap it again.

@Corpius, because BIII support ballanced output, so what I mean is can I connect its output directly to a preamplifier with Single End input (RCA jack)? I just want to check if BIII still working, so the sound quality is not important to me on this step.

Thank you.
Back to top
Corpius  
#6 Posted : Sunday, September 23, 2012 7:41:09 PM(UTC)
Corpius

Rank: Member

Groups: Member
Joined: 2/1/2012(UTC)
Posts: 332
Location: The Netherlands

Thanks: 4 times
Was thanked: 18 time(s) in 18 post(s)
No, you need a I/V stage.
http://ce-designs.net/
Back to top
WWW
bitinhvi  
#7 Posted : Monday, September 24, 2012 12:45:11 PM(UTC)
bitinhvi

Rank: Member

Groups: Member
Joined: 9/5/2012(UTC)
Posts: 59
Viet Nam
Location: Hanoi

Thanks: 5 times
Thank you Corpius, I just found out that 01 LME49600 on my Legato was dead. It should be fine after replace it.

Can you help with a newbie question, how should I set DIP switch if I use BIII in stereo mode with only Optical/Coaxial input at D1?

Thank you very much.
Back to top
bitinhvi  
#8 Posted : Monday, September 24, 2012 3:25:13 PM(UTC)
bitinhvi

Rank: Member

Groups: Member
Joined: 9/5/2012(UTC)
Posts: 59
Viet Nam
Location: Hanoi

Thanks: 5 times
According to manual, I set DIP SW as following:
SW1: All OFF
SW2: 1-2 ON. 3-8 OFF

I tried to feed Optical SPDIF signal to D1 -> D4 but still got no LOCK LED. Voltage to BIII and TOSLINK is 5.2V, shunted current (with TOSLINK) is 70mA. Voltage of Tridents are correct (3.27V and 1.27V), their position are fine. All LED (except LOCK) are lit.

Pls help.
Back to top
Rss Feed  Atom Feed
Users browsing this topic
GuestUser (3)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Youtube
Copyright © Twisted Pear Audio