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audi0 28th August 2010 07:16 AM

I2S query
I wonder if one of you knowledgeable gents would help me with this query; Is adding I2S to a TDA1543 DAC as simple as tapping into the Data, WS and BCK between the receiver and DAC chips, or am I missing something?

Bill Fuss 29th August 2010 12:10 PM

If you are asking, can I use an I2S feed to the dac chip instead of the receiver chip, then yes, but don't try cables for the connection. Keep the wires as short as possible, a few inches is OK.

audi0 30th August 2010 06:52 AM

Many thanks Bill, I am planning to switch (probably with relays) between the receiver chip and I2S inputs. Yes the leads will be very short <50mm

cheers.. Steve

Bill Fuss 30th August 2010 10:34 AM

I have to get nosey, what are you building? I built a Redbook CD player with an old Magnavox CDM4 player and a Chinese upsampling dac board with outstanding results.

audi0 30th August 2010 11:11 AM

Hi Bill, after reading the "Do Audiophiles want a stand alone high end HDD source?" thread, I thought that I would purchase a WD Mini off of ebay and do the I2S conversion suggested by Erin.
I thought I would build a linear power supply (easier bit) and a daughter board for the reciever chip and relays etc., as I would still like the option of an external SPDIF source as well. Sound OK?

Bill Fuss 30th August 2010 12:43 PM

Sounds great. You also have the option of using SS switching instead of relays. There are a number of switching ICs you could use. I was researching these a few months ago and believe they would be more stable than relays. Then my puter crashed, lost my focus. I'll see if I can resurrect some info for you.

Bill Fuss 30th August 2010 01:51 PM

Check out Maxim's MAX4754. Small but simple.

Google (quad spdt switching) for others.

audi0 31st August 2010 07:14 AM

Thanks for the info Bill, much appreciated. Unfortunately smt and logic circuits are not my strong point!
I guess there would probably be a DIP version? I'll Google it, but I'm not not sure how to switch with logic?

Bill Fuss 31st August 2010 03:05 PM

I would imagine someone made them in dip size. Really, they operate just like a relay. One is NC and one is NO, you just switch the power to it on and off with a toggle or whatever.

Bill Fuss 31st August 2010 03:26 PM

Vishay DG333A. Runs on 5v, 20 pin dip. Just power the V+ with 5v and the 4 in pins with 5v through a limiting resistor and you are in business.

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