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Rca ground shocks
Rca ground shocks
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Old 26th January 2017, 12:07 PM   #11
donovas is offline donovas  South Korea
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mckaym, have you found what the issue is?

earth is correctly wired at the friend's place. finally got a tester and that was the first thing i tested out along with dc on mains.

the dac has a tube output, btw, and i isolated the problem to 220v input 110v output transformer, so yeah, my problem is very similar to mckay's

the transformer has no center tap, and since it's a wooden chassis, nothing else to connect to safety earth. it's an ei transformer and i tried connecting the metal housing to the earth without much difference.

the voltage i get on the rca ground of the dac is 60 something volt in reference to the ground of other electronics. its much higher if the dac is turned off. (???!!)

the issue goes away if i disconnect the 110v transformer but of course also with no sound...
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Old 26th January 2017, 12:11 PM   #12
DF96 is offline DF96  England
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Why start two threads on the same problem?
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Old 26th January 2017, 12:16 PM   #13
DF96 is offline DF96  England
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Is it leakage current through mains filter capacitors?

Is it insulation breakdown in the mains transformer?

All external metal should be connected to safety earth, so don't say there is nothing to connect.
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Old 26th January 2017, 12:26 PM   #14
mckaymckaymckay is offline mckaymckaymckay  United Kingdom
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I never did find out why it does it.

However it appears to work fine and does not cause issues when operating (except if you bridge yourself between earth and the chassis).

Its currently still 2 core mains input, with no earth.
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Old 26th January 2017, 12:31 PM   #15
Mooly is offline Mooly  United Kingdom
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Rca ground shocks
This could be anything from a lethal problem to a non existent issue.

BUT YOU NEED TO BE SURE WHICH.

A shock from 220 vac caused by faulty equipment would leave no doubt something was seriously amiss. You would be on your back on the floor, not typing about it here and wondering.

If you are not confident on how to test this THEN GET IT CHECKED PROFESSIONALLY.

Connecting a 1500 ohm between the two suspect points (and if it goes up in smoke you have your answer anyway) would allow you to measure any AC voltage developed across that resistor and so calculate current.

Anything over around 0.2milliamps needs investigating.
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Old 26th January 2017, 12:40 PM   #16
mckaymckaymckay is offline mckaymckaymckay  United Kingdom
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Its not 220VAC, its more like the type of static shock you would get from an old CRT monitor.
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Old 26th January 2017, 12:41 PM   #17
Mooly is offline Mooly  United Kingdom
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Rca ground shocks
Quote:
Originally Posted by mckaymckaymckay View Post
Its not 220VAC, its more like the type of static shock you would get from an old CRT monitor.
Quote:
Originally Posted by donovas View Post
Hi, i am in korea- 220v mains. No polarity on ac
My message was aimed at the op
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Old 26th January 2017, 12:43 PM   #18
mckaymckaymckay is offline mckaymckaymckay  United Kingdom
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Cool!, what do you think it is with mine (incidentally).
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Old 26th January 2017, 12:53 PM   #19
wwenze is offline wwenze  Singapore
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mckay's situation is most likely this.

https://www.youtube.com/watch?v=l512uWJ0mgQ

However this kind of things does not cause the transformer to scream in agony like in donovas's case. Any situation that results in heat and noise(!) needs to be taken very seriously.
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Old 26th January 2017, 12:53 PM   #20
Mooly is offline Mooly  United Kingdom
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Rca ground shocks
Hard to say. You would need to look at all possible causes.

If the Pioneer has a two core lead (is that as originally designed and approved ?) then perhaps some leakage or coupling from the transformer is occurring. Wouldn't like to guess on that tbh although it should be possible to find the cause with methodical testing.
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