Should the R and L RCA center pin have the same resistance?

Nehan · 3875

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Offline Nehan

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Reply #15 on: April 21, 2015, 09:51:55 AM
I saw a spark and I heard a sound like a small firecracker.


Offline Nehan

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Reply #16 on: April 21, 2015, 11:01:28 AM
You are right. Checking the voltages now, everything is ok. The noise is still there though.


Offline Doc B.

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Reply #17 on: April 21, 2015, 11:31:23 AM
Does the noise go up and down with the volume control? Does it stay the same as the volume control goes up and down? Is it a buzzy sound? Have you checked the other threads about this kind of thing for suggestions for possible solutions?

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Offline Nehan

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Reply #18 on: April 22, 2015, 07:26:13 AM
The noise go up and down with the volume control, and when the volume control is set to 0, there aren't noise.
Indeed I have checked other threads.
I'm not sure if it's a buzzy sound. Is like a pink noise.
I don't think that I have a problem with RF at RCA because there are <50cm long and have a great insulation.
My apartment doesn't have ground and, generally, I have an old and bad electrical installation. Maybe is it?


Offline fullheadofnothing

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Reply #19 on: April 22, 2015, 07:39:57 AM
If the noise is altered by the volume control, that means that it is not a problem with the circuit. Either it is insufficient isolation of the wires that go from the jacks to the potentiometer (i.e. poor braiding, or locating the wires too close to the circuit), or it is related to your interconnects or source component.


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Offline Paul Birkeland

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Reply #20 on: April 23, 2015, 05:48:51 PM
Quote from: Nehan on April 21, 2015, 07:56:46 AM
The path is PC > ODAC RCA > Crack > Sennheiser HD600.
Do you get noise with the PC unplugged from the DAC?

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Offline Nehan

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Reply #21 on: April 24, 2015, 04:11:10 AM
Quote from: Caucasian Blackplate on April 23, 2015, 05:48:51 PM
Do you get noise with the PC unplugged from the DAC?
Without any connection, I get noise at ~70% volume control.
With the DAC connected, and the PC unpuggled, I get noise at ~20% volume control.
With the PC plugged, I get little noise at ~35% volume control. Less that when the PC is unplugged

When I say volume control, I mean the percentage of the total path of the potentiometer.


Offline Grainger49

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Reply #22 on: April 24, 2015, 06:03:51 AM
Well, you found the source of your noise.  I'd bet you have even less noise with all digital things like the computer, cell phone, DAC turned off or moved away from the Crack.


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