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Maybe he could do video segments for this. Something along the lines of firemarshal Bill. Only it would be electrical inspector Amir.
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Review and Measurements of Schiit Jotunheim and iFi iDSD Black Label DACs and Headphone Amps
- Thread starter amirm
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OP
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- #142
I just wrote a little article on the mod for the Schiit Jotunheim hum issue: https://audiosciencereview.com/foru...th-schiit-jotunheim-headphone-amplifier.3733/
As you see there, I found out the bottom of the case is not grounded either!!! The only thing standing between you and potential electric shock is the powder coating.
As you see there, I found out the bottom of the case is not grounded either!!! The only thing standing between you and potential electric shock is the powder coating.
OP
Lol, I spoke too soon... So, where is the grounding pin connected to? Ground on the PCB?
OP
This doesn't make any sense.
OP
Afaik, you generally don't want audio ground to sit on equipment ground as it is ground loop prone. Regardless it is often done this way for cost reasons but the chassis is also grounded, so you are safe at least and compliant but maybe with a ground loop. Here you are unsafe and with a ground loop, not cool.
OP
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- #150
Yeh, I was concerned about that as I proceeded to complete the mod. Fortunately measurements show the previous improvement and no ground loop.
As I noted in my mod article, the right fix is a ground wire lug to the chassis.
As I noted in my mod article, the right fix is a ground wire lug to the chassis.
But the mod could not introduce a ground loop as it was already there in the first place (RCA ground connected to equipment ground), at least potentially, perhaps your source is ground loop safe that's why you didn't have it.
Not really, its only the Schiit supporters club that keep the questions coming, hoping for some saviour reason to be unearthed...….
Is there any chance this could be considered double insulated? IIRC it can be classed as such if the mains sections have sufficient air gap and or additional insulator layer between them and the case.
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Yes, that fits my understanding of the rule about double insulation. If no wires are capable of coming loose and contacting the case, it can be metal and still be considered double insulated. Though I noticed Schiit doesn't have the double insulated emblem by the power cord plug.
Why bother with the ground pin at all then?
OP
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You don't have to with double insulation.
I've mentioned having some AVR's which only have two pins. The Marantz has this standard IEC plug, but it only has two plugs of three on the unit, and on the included power cord. If I needed a longer cord it would fit and work though the third pin isn't connected. It is a double insulated unit, but I'm guessing using a standardized IEC connector is cheaper, simpler than doing it otherwise. This with a metal case. Or perhaps they didn't want people paying big money for a AV pre/pro to notice it has a thin two wire cord like a cheap AVR. So they put this one on it to look more upscale.
C17/C18 coupler
Similar to C13/C14 coupler, but unearthed. A C18 inlet will accept a C13 connector but a C14 inlet will not accept a C17 connector.
Three wire cords with C13 connectors, which are easier to find, are sometimes used in place of the two wire cords for replacement. In this case, the ground wire will not be connected.
The C17/C18 coupler is often used in audio applications where a floating ground is maintained to eliminate hum caused by ground loops.
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Is there any sign of intended connection point between the chassis and the ground pin that may have been botched during assembly?
OP
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