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Old 8th August 2004, 03:29 PM   #1
Johnix is offline Johnix  France
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Question Safety issue using (mono) jack plugs

Hi,

1st of all, i'd like to know the exact connections inside a jack plug :

For a stereo jack :
Click the image to open in full size.

the extremity is the left signal
the middle is the right one
then it's ground (the bigger one)

Is this correct ?


For a mono jack :
the extremity is the hot point
then the bigger part is the ground ?

Correct as well ?

Click the image to open in full size.


If so, when you connect a mono (male) plug inside a stereo (female) one, is there a risk to short-circuit the right channel of the female plug (through the common ground of the male plug) ?

I am designing a headphone amp so this has to be taken into account
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Old 8th August 2004, 03:42 PM   #2
Netlist is offline Netlist  Belgium
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Hi Johnix
Stereo: correct
Mono: correct
Yes, you will ground your right signal. This is not correct but not harmful to the headphones or amp.

Edit: It's harmless at line level, which isn't your case. You will short your amps right output and that's not good.

/Hugo
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Old 9th August 2004, 07:40 AM   #3
Johnix is offline Johnix  France
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So I suppose my amp need to work even with it's output grounded


Not easy....
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Old 9th August 2004, 08:03 AM   #4
Netlist is offline Netlist  Belgium
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Grounding amp inputs is harmless, grounding outputs is harmfull.
Maybe I wasn't clear enough.
So you should use both male and female stereo jacks.

/Hugo
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Old 9th August 2004, 10:41 AM   #5
Johnix is offline Johnix  France
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Well, I personnaly won't plug a mono jack in my female stereo socket


I was just thinking of what could happen if somebody not aware of that problem accidentaly plugged a mono jack


What about inserting a resistor between the output of the headphone amp and the socket ?
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