DIY Front End 2022

[ghitus]

No. Pin 1 to metal case. It´s the shield and not part of the signal transmission.Thought

I thought pin1 was the signal ground (not to be connected to the chassis)...

 

[claudio52]

Hi Keps, here are some useful instructions on how connect 1:

D

Thread 'Audio Component Grounding and Interconnection'

2010-04-21 1:00 pm

This article focuses on audio system design for the DIY enthusiast implementing a stereo system for home use. There is a lot of information available for designing audio circuits, but precious little on interconnecting those circuits into a total audio system to achieve maximum performance. Interconnecting circuits to create an audio system involves connecting signals and grounds , both within a single component as well as between components. This article has the most benefit for the person constructing his or her own equipment, rather than merely interconnecting finished components...

• David Davenport
• Replies: 76
• Forum: diyAudio.com Articles

• 
• 

 

[keps]

Grazzie Claudio! I will read as advised.

 

[keps]

Finally recieved all my PSU parts and I decided to use a bipolar PS. I humbly ask for help in finalizing my wiring as I got confused again.

Please see the diagram for correction.

Thanks again.

 

[claudio52]

To avoid the "pin 1 problem" the cable shield should and pin 1 have been connected to the chassis, instead of the signal reference. The shield and pin 1 of the cable should be connected to the chassis also on the source side.

 

[keps]

Thanks again Claudio, I will connect pin 1 to chassis as well as the shield.

Otherwise, everthing else in the drawing are all good to go?

 

[lineup]

In this post Nelson Pass presented a Revision: https://www.diyaudio.com/community/threads/diy-front-end-2022.394339/post-7323986
He recommended a compensation cap and adding a potentiometer.

I think this potentiometer better add in the current source of the LTP.
This will adjust for different IDSS of the J113 in this source.
See my simulation image here:

 

[claudio52]

Thanks again Claudio, I will connect pin 1 to chassis as well as the shield.

Otherwise, everthing else in the drawing are all good to go?

I think that else in the drawing are all good.
Let us know how it goes.