Introducing the bit "Teleporter" - Page 22 - diyAudio
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Old 25th April 2012, 09:19 AM   #211
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Quote:
Originally Posted by bikerboy View Post
HI,
I have the teleporters up and running.
PC->Teradac Terelink module via I2s ->Teleporter->6'cat5->Teleporter->I2s input on sidecar.
Set the transmit teleporter to open/off and the receiver teleporter to closed/on.
Tony- I have the module, you may have the cased teradac. But I use this for connections and it works. LRCK->D1/LRCK, Data->D2/Data, SCLK->BCK, no ground connection.
I made a little lm7802 ps @ 4.8v for the teradac/pc end and used the lcdps @5.0v in the dac case to power the teleporters.
After reading some threads I set the SW1 #5 and #8 on, SW2 #5 and #8 on, all other switches off. I now can use the teradac usb-i2s converter without the constant dropouts I had before. In the past the teradac was unusable via i2s. I could use it with the spdif out but the i2s sounds better. The dac will still drop the signal occasionally but is usable. SQ is very close the the shigaclone transport when using the i2s connection on the teradac.
Teleporter received (after it's laborious journey through British customs), powered up, DIP switches on Teleporters set as per the above. Connected as follows (Teralink to Buffalo II) :- SLCK - DCK, LRCK - D1, Data - D2, plus ground to rearmost set of connectors as per previous post.

Dual-mono so both SP/DIF switches set to off, equal-length (6mm) connections to both DACs. Both lock LEDs on and rock steady, but no sound, not a peep!

My immediate suspicion falls on the Teralink and if that's the case, I've got an alternative USB - I2S board on its way so not a major issue, but I'd be very grateful if someone cold confirm I've got the connections and switches set correctly.
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Old 25th April 2012, 10:21 AM   #212
Sandor is offline Sandor  Italy
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I'd like to tap I2S signals from my squeezebox boom and use a teleporter to connect an external DAC. I suppose the source signals are referenced to ground.
May I directly connect I2S in the squeezebox to the inputs of teleporter? Or should I insert a capacitor or a pulse transformer?
Thank you.

Paul
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Old 25th April 2012, 12:43 PM   #213
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Quote:
Originally Posted by SCompRacer View Post
I need to put the covers back on the DAC and CD player?
Yes, sounds like a shielding/EMI issue. Could be at the DAC or the Source.
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Old 25th April 2012, 12:44 PM   #214
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Quote:
Originally Posted by Sandor View Post
I'd like to tap I2S signals from my squeezebox boom and use a teleporter to connect an external DAC. I suppose the source signals are referenced to ground.
May I directly connect I2S in the squeezebox to the inputs of teleporter? Or should I insert a capacitor or a pulse transformer?
Thank you.

Paul
Direct. You would not want to use a transformer or cap because you need the PCM signals to go down to DC. They are not only AC signals.
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Old 26th April 2012, 07:17 AM   #215
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For interested on the subject - take a look at the photos.
This is how Teleporter is implemented in my setup. In this case, transmitting side is SB Touch and signal goes into FDA-1 DAC. Normally I use only 6 feet cat 5e cable but initial tests were done on up to 30 foot lengths resulting in success. If I wanted to make some comments or remarks and maybe help others how to properly implement Teleporter I'd say that first of all make sure you have correctly tapped I2S signal from your digital source. Of course this doesn't apply to those who already own devices with I2S output. Having that done, test your connection "short hardwired" - simply put your source and DAC side by side and use max up to 20cm or 8" wires to inject I2S. Keep in mind that probably you need to tweak that connection. Some setups require ground connection along signal, some not. Others need master clock - SCK to operate, again others not. Just experiment until you hear desired effect (clear, undistorted music). If this step is successful then keep moving on. Assuming you mark which wire carries which signal it's time for Teleporters. Speaking about power supply - you don't need anything fancy. It would be just enough to use 5V from anywhere in your enclosure. If you have time and energy make something dedicated but I use 5V right from the SB Touch power plug and everything works perfectly. Notice it is switching, "polluting" power supply ! Teleporter is small and very manageable but it will not fit into SB Touch case, unless stripped of Ethernet socket and power connector :-). Connecting I2S signal to Teleporters make sure you follow exactly the same pattern on both ends (receiver and transmitter). Don't forget about setting Teleporter jumpers into right modes ( one is receiver, other transmitter) and making ground connection (I2S neighbouring parallel row of pins). Once done, test it on short cat 5e cable and only then extend if it works.
My experience taught me that Teleporters setup can be very sensitive to external factors. Particularly to nasty spikes in power lines and electrical fields generated for example by ionizer. This is empowered by having very long cable going near power lines or devices with higher voltage creating some potential differences in the length. I spent whole evening battling over the problem only to find out later that everything was fine after moving away from that ionizer thing. Shielded Ethernet cable may help. Keeping I2S wires before Teleporter board as short as possible also eliminates chances of pickup any electromagnetic "trash".
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Last edited by Thomas Giz; 26th April 2012 at 07:22 AM.
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Old 27th April 2012, 11:34 PM   #216
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Quote:
Originally Posted by Thomas Giz View Post
For interested on the subject - take a look at the photos.
Nice job on the Touch I2S/Teleporter Thomas. I'm interested in doing that as I use a SB Touch for the majority of my listening. My CD player PCM/DSD out is just for BYO (bring your own) music meets. Do you have pics with the Touch's I2S tap locations?
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Old 28th April 2012, 05:22 AM   #217
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Thanks SCompRacer
Getting I2S from SB Touch is pretty straightforward procedure however requires very good eye, steady hand and thin wires. After you get your Touch disassembled, you''ll notice numerous testing points (TP) on the PCB. The ones you're interested in are located near AKM4420 dac chip. These are:
TP 260 (Bit Clk), TP 267 (Word Clk) and TP 269 (Data). Markings in my Touch were quite smeared and unreadable so looking at the AKM datasheet eased my life. You can find it here:
http://www.asahi-kasei.co.jp/akm/en/...k4420_f06e.pdf

Depending on your setup you may need also Master Clock (SCK) which you can retrieve from pin 4 of dac chip. Same signal you'll find on the inverter located between oscillator crystals - just easier to solder.

Don't forget about ground node and of course keep those wires as short as possible. Mines have no more than 1.5". I simply drilled the hole in the enclosure right over the dac chip to get them through. Putting blob of hot glue etc. on the wire solder area before assembling the Touch, keeps the wires secure.

Did not make any photos but browsing the web brings some eg.

K&K Audio / Lundahl Transformers
Touch I2S-out and Clock-in mods

Some people question whether it is worth doing this mod as long as you not bring external clock in. IMO the difference between Touch SPDIF and I2S outputs is subtle but definitely there is and it's worth every effort :-)

Last edited by Thomas Giz; 28th April 2012 at 05:38 AM.
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Old 14th May 2012, 09:51 PM   #218
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If i choose to have two teleporter receivers for two I2S sources in my DAC what do you recommend to switch between them?
Regards
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Old 15th May 2012, 06:54 PM   #219
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As Otto not available, i guess i will have to diy one myself
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Old 19th May 2012, 09:51 PM   #220
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I would use only one teleporter receiver and do switching before it. Messing with small sensitive i2s signals after receiver may introduce undesired effect. Even simple mechanical switch could work here.
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