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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 1st May 2014, 05:01 AM   #191
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by linuxfan View Post
Another technical question please:
I see on the Neutrik XLR socket that the lower mounting hole is electrically connected to pin 1,
so when the Neutrik is attached to the rear chassis with a screw, pin 1 is then connected to the chassis -
that's all fine and correct for balanced output connections ...

... but on the PCB pin 1 of the XLR socket is also connected to RCA ground - thus RCA ground is also (permanently) connected to the chassis.
I thought that unbalanced outputs were supposed to have floating grounds. Is this correct ??
please see image for your conect GND and RCA out
Attached Images
File Type: jpg Super IV with RCA.jpg (380.7 KB, 430 views)
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Old 1st May 2014, 05:28 AM   #192
linuxfan is offline linuxfan  Australia
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Yes, I see the correct jumper-connections at J1 and J2 for RCA output, but my question remains:
the RCA ground is permanently connected to chassis via pin 1 (and the lower mounting screw) of the Neutrik socket.
Is it correct to have RCA ground to chassis?
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Old 1st May 2014, 05:34 AM   #193
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by linuxfan View Post
Yes, I see the correct jumper-connections at J1 and J2 for RCA output, but my question remains:
the RCA ground is permanently connected to chassis via pin 1 (and the lower mounting screw) of the Neutrik socket.
Is it correct to have RCA ground to chassis?

HI!

pin 1 of Neutrik, it is GND , only conec to the GND of DAC

You not connect direct to Earth of Chassis.

Please conect GND of DAC to Earth of Chassis.

That i see your question ??
thanks
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Old 1st May 2014, 08:21 AM   #194
linuxfan is offline linuxfan  Australia
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Sorry, I'm not understanding you. As I read your comments, they seem to contradict. Maybe words fail.

Quote:
Originally Posted by quanghao View Post
pin 1 of Neutrik, it is GND , only conec to the GND of DAC

You not connect direct to Earth of Chassis.
OK, this makes sense to me, but it doesn't agree with what I see on the Neutrik connector; photo attached.
There's a small metal bracket which connects pin 1 to the inside of the mounting hole. Once a screw is inserted from the outside of the chassis, a connection will be made between chassis and pin 1.
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File Type: jpg neutrik.jpg (87.5 KB, 409 views)
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Old 1st May 2014, 09:09 AM   #195
MattMax is offline MattMax  Netherlands
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Quote:
Originally Posted by audiodesign View Post
Are you using un-balanced output on RCA ?

The LL1684 output stage give at 0dB a standard 2Vrms so probably your amplifier cannot be used without a pre-ampl.
I am using the balanced output of the LL1684 output stage. What would be the best approach in this case? Just using the active output or is there a way I can still keep the LL1684 output stage combined with an active stage?
Thanks.
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Old 3rd May 2014, 09:15 PM   #196
palmito is offline palmito  United States
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Super V/i converted (LL1684 )
Default Got the boards!

Thank you Quanghao, they were just delivered by the post office! They look fantastic and will definitely look better than the spaghetti of wires I currently have...

Also noticed some things where soldered, so not strictly a bare board!

Two questions:

1) Repost from before, and I know it's been answered before: can we use a 2.2uF in the C4 position?

2) Is there a mechanical drawing for the xlr/rca connectors in the back (to use it as a template to cut holes in the case). I know I'm being lazy, but if it exists...

Thanks again.

Last edited by palmito; 3rd May 2014 at 09:18 PM.
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Old 4th May 2014, 01:08 AM   #197
quanghao is offline quanghao  Viet Nam
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[QUOTE=palmito;3914779]Thank you Quanghao, they were just delivered by the post office! They look fantastic and will definitely look better than the spaghetti of wires I currently have...

Also noticed some things where soldered, so not strictly a bare board!

Two questions:

1) Repost from before, and I know it's been answered before: can we use a 2.2uF in the C4 position?

yes C4 and C9 you can use cap : 1uf to 22uF MKP, so no need use cap = 22uF OS-con

2) Is there a mechanical drawing for the xlr/rca connectors in the back (to use it as a template to cut holes in the case). I know I'm being lazy, but if it exists...

no , you can not us it!
thanks quanghao
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Old 4th May 2014, 01:35 AM   #198
palmito is offline palmito  United States
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Thanks for your hard work Quanghao, this board was a great idea.
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Old 4th May 2014, 02:52 PM   #199
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by palmito View Post
Thanks for your hard work Quanghao, this board was a great idea.
Thank you for trusting me!

This PCB you can use with Jensen transformers, see image below PCB!
again thank you!
quanghao
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Old 4th May 2014, 03:02 PM   #200
palmito is offline palmito  United States
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Quote:
Originally Posted by quanghao View Post
This PCB you can use with Jensen transformers, see image below PCB!
I was going to ask about that, I notice it says "JT-11SS-DLCF" and was going to ask if this was another transformer. Nice extra functionality!
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