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keinesorge

Breeze Audio USB SPDIF converter (optical transmitter swap)

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Some time ago i received a USB spdif converter from @NKMA (thanks!).

While trying it out i noticed that the output coax was nice but the optical wasnt the best sounding.  I subseqently broke the dust cover for the optical port so a fix was on the cards.

 

The long and short of it:

1.  The stock optical transmitter (TX141L) did not match the part number on the PCB.  Although similar, the items are not identical (says the datasheets).

2.  TX147 installed.  No discernible difference now between optical / coax.

3.  Transmit power and / or port design might have something to do with it.  (The port was different on the stock item to replacement transmitter).repair-before.jpg.2c5843e558f4f656d305e31226d1ebff.jpgrepair-after.jpg.93543b68489e7e59f545e781f6b53382.jpg

 

If anyone is using one of these, check the transmitter.  The model reference is on the back of the plastic housing.  If its not a TX147 (and especially if its a TX141L), there might be gains to be had with swapping the optical transmitter.

I went with the option of a removable dust plug.

 

 

Edited by keinesorge

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I do not see what is a difference between the two and why would this replacement result in any improvements - all Toslink transmitters work with the same voltages and pinouts. 1- GND; 2- Vcc 3- Vin. Mechanically they can be with dust caps or flip gates but that is irrelevant for the performance. The real limitation is in the data protocol not the actual transmitter or receiver electronics. 

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8 hours ago, Decky said:

I do not see what is a difference between the two and why would this replacement result in any improvements - all Toslink transmitters work with the same voltages and pinouts. 1- GND; 2- Vcc 3- Vin. Mechanically they can be with dust caps or flip gates but that is irrelevant for the performance. The real limitation is in the data protocol not the actual transmitter or receiver electronics. 

Hi Decky,

 

The rated transmission distance is not consistent with both parts.  As are the pulse width distortion and current consumption ratings.  V(IH), ditto.

The physical design of the port surrounding the waveguide is also dissimilar.

 

The dust plug version seems to have a sleeve aound the waveguide which might not be possible with the flip gate item.

 

The board looks to have been designed with a specific part in mind and it seems that a swap has taken place.  While both parts are pin for pin (and mounting point) compatible, there are physical and eletrical differences.

 

Someone was generous enough to give me this item and i'm just putting this out there for anyone who might own the same Breeze Audio USB - SPDIF converter.  Respectfully, I'll leave communication protocols and effective bandwidth for another thread (which i wont get in to).

 

The replacement item was purchased from ebay (eBay item number: 391813357096).

Edited by keinesorge

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