The Zishan dsd's corner
Dec 28, 2018 at 11:29 AM Post #1,366 of 3,711
Dec 28, 2018 at 11:53 AM Post #1,368 of 3,711
Guys, anybody using the 2.5mm balanced output, what type of wiring uses?
I came across this picture, and I want to build a custom cable. Which standard should I use, so that it is compatible with the zishan?

@ThanosD

Sleeve= Left -
Ring 2= Left +
Ring 1= Right +
Tip = Right -

It's like AK DAP in your picture
 
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Dec 28, 2018 at 12:10 PM Post #1,370 of 3,711
You're welcome

Yes, L-/R- combined is SE, but don't combine them on 2.5mm output, not sure what happens if you do that.
 
Dec 28, 2018 at 12:30 PM Post #1,372 of 3,711
Guys, anybody using the 2.5mm balanced output, what type of wiring uses?
I came across this picture, and I want to build a custom cable. Which standard should I use, so that it is compatible with the zishan?

The DSD uses a 2.5mm TRRS jack for Balanced output, and this drawing shows only one 2.5mm pin-out. That wiring is correct:
Sleeve = L-
Ring-2 = L+
Ring-1 = R+
Tip = R-
 
Dec 28, 2018 at 12:42 PM Post #1,373 of 3,711
You're welcome

Yes, L-/R- combined is SE, but don't combine them on 2.5mm output, not sure what happens if you do that.

You short out, and probably damage, the op-amps that are driving the L- / R- pins.
 
Dec 28, 2018 at 12:43 PM Post #1,374 of 3,711
Multiple post deleted - having issues with phone.
 
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Dec 28, 2018 at 12:44 PM Post #1,375 of 3,711
Multiple post deleted - having issues with phone.
 
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Dec 28, 2018 at 12:44 PM Post #1,376 of 3,711
Multiple post deleted - having issues with phone.
 
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Dec 28, 2018 at 12:58 PM Post #1,377 of 3,711
There's no single reason which i can think of why two opamps, connecting both -channels together, and let +channels open, would damage. I rather could think of ak4497 problems connecting this way.

Anyway, the answer is obsolete because he wants to make an adapter from 2.5mm to 3.5mm so he can use his hp's SE ad Balanced as well.
 
Dec 28, 2018 at 1:14 PM Post #1,379 of 3,711
There's no single reason which i can think of why two opamps, connecting both -channels together, and let +channels open, would damage. I rather could think of ak4497 problems connecting this way.

Anyway, the answer is obsolete because he wants to make an adapter from 2.5mm to 3.5mm so he can use his hp's SE ad Balanced as well.

The only safe way to do that, is to use sufficient series resistors, so that the output of the L- / R- op-amps are not shorted together.

The issue is this:
Both op-amps are capable of driving an output voltage swing of nearly the +/- power supply voltage (nominally +/- 15Vdc).
If the Left channel output signal is at +15Vdc, and the Right channel output signal is at -15Vdc - then there's 30Vdc difference between the two op-amp output pins, that you're shorting together.
Suppose there's ~1Ω of trace / wire resistance between the two output pins - then the op-amps would try to supply 30 Amps of current, which they can't do.
 
Dec 28, 2018 at 1:15 PM Post #1,379 of 3,711
Multiple post deleted - having issues with phone.
 
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