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-   -   Salas DCG3 preamp (line & headphone) (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone.html)

lykkedk 15th November 2016 12:53 PM

I have been trying to find a decent product, with no luck so far.

I cannot find any datasheet claiming, that no shortcircuit is present, when plugging/unplugging. -Next step is to write to neutrik, asking them directly?

Another option i consider is to use normal XLR plug's (Male+female), and just solder those types on our headset.

But i would like to keep it original through if possible.

Jesper.

drpro 15th November 2016 01:16 PM

Try a "make" before "break" connector

Salas 15th November 2016 02:02 PM

https://www.stringsfield.com/en/cat/jacks/

lykkedk 15th November 2016 06:03 PM

Hi all here :)

I was digging into this jack phenomena thing.
After i did some research, and looking into severel datasheets, i took contact with Neutrik.

After a little while, someone really kind there, was replying my quistion.
This was some of the reply, which i also expected myself.

Quote:

but some form of shortcircuit will always be due to the design (IEC 60603-11 and EIA RS-453) I suppose
Anyway, could it be that it's just like this, and no equipment will fail for such a shorttime shortcircuit ? -Or am i crazy :confused:

I will not go offtopic here, but i think it is a good thing to know, that jack sockets really have to be selected carefully.

Jesper.

Hikari1 15th November 2016 06:16 PM

If you are really worried about it (and I am not), the solution is 4 pin XLR or something with a 1/4 adapter. Unplug the 4 Pin from the headphone amp first, then the 1/4 to 4 pin adapter from the headphones.

I have a Pass F5-based headphone amp that in theory does not like the output shorted. I usually turn the volume down all the way and make sure the source isn't playing when changing phones. But I have forgotten many times. I usually unplug and plug real quick though. No problems yet.

lykkedk 15th November 2016 06:21 PM

Quote:

Originally Posted by Hikari1 (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4887410.html#post4887410)
If you are really worried about it (and I am not), the solution is 4 pin XLR or something with a 1/4 adapter. Unplug the 4 Pin from the headphone amp first, then the 1/4 to 4 pin adapter from the headphones.

I have a Pass F5-based headphone amp that in theory does not like the output shorted. I usually turn the volume down all the way and make sure the source isn't playing when changing phones. But I have forgotten many times. I usually unplug and plug real quick though. No problems yet.

Yes... I will proberly use an female XLR 3pin (what i got in drawer) on pre. chassis-front. Then make adaptors for both 6.35mm and 3.5mm. male jacks.

Jesper.

Salas 15th November 2016 07:28 PM

2 Attachment(s)
With this classic type of panel jack I did not have any practical problems

AndrewT 16th November 2016 07:43 AM

headphone outputs that had a 100r in the line would be impervious to this momentary shorting.

But the fashion now seems to be to go for very much lower output impedances. I adopted 10r in my last build (it had no location on the PCB) and even that is frowned on by many Members of this Forum.
Shorting the output when Zo<<1r is a risk.

AndrewT 16th November 2016 07:45 AM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4887481.html#post4887481)
With this classic type of panel jack I did not have any practical problems

the curve on the contacts may make this a break before make as the plug slides in/out.

Stixx 16th November 2016 08:55 AM

Interesting topic.

In 14 years listening to headphones only, with expensive headphones on a good dozen of different amplifiers I never had a problem with connecting/disconnecting the headphones with the equipment switched on (sometimes not even the volume turned down all the way :eek:).

No damage, no strange noises, so I safely assume that this is a non-issue?

But maybe I was just being lucky...


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