Paradise Builders - Page 287 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th September 2013, 07:33 PM   #2861
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
Since casing up my Paradise build it has never been fully hum free but this has been made noticeably more prominent since installing a recently built Aleph J into the system.When music is playing I don't notice the hum but can hear it from my listen position between tracks.It makes no difference if the earth wire from the deck is connected or not.The only thing that stops it is gripping the right output phono plug between my thumb and finger.
Any advice gratefully received.
  Reply With Quote
Old 19th September 2013, 07:53 PM   #2862
diyAudio Member
 
Benedetto's Avatar
 
Join Date: Nov 2007
Location: Knifetown-Germoney
HI M,
what grounding schema did you apply ?
__________________
preregulatorpeterE-MAIL
  Reply With Quote
Old 20th September 2013, 08:43 AM   #2863
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
Quote:
Originally Posted by Benedetto View Post
HI M,
what grounding schema did you apply ?

Hi B;I had hoped to post pics but my camera won't charge for some reason.
In the p/s box the mains earth is connected to the chassis and a wire taken from this point to a 7 pin connector and through to the Paradise box where it is connected to the chassis.The +G- wires times 2 connect to the two Paradis pcb's. Grounding in the phono amp consist of a wire from each boards output to the chassis ground along with the deck grounding post which is connected to this point through a resistor/capacitor isolator.
Having relooked at Frans schematics and BK's posts I think? that I have misinterpreted them
  Reply With Quote
Old 20th September 2013, 08:50 AM   #2864
hesener is offline hesener  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Munich, Germany
Quote:
Originally Posted by Marra View Post
In the p/s box the mains earth is connected to the chassis and a wire taken from this point to a 7 pin connector and through to the Paradise box where it is connected to the chassis.The +G- wires times 2 connect to the two Paradis pcb's.
Thats ok, these wires should connect at the power connector (upper righthand corner, next to the heatsink). If all else fails (see below) you may want to put two power diodes (back to back) between the mains earth and the P/S ground, nelson pass style....

Quote:
Originally Posted by Marra View Post
Grounding in the phono amp consist of a wire from each boards output to the chassis ground along with the deck grounding post which is connected to this point through a resistor/capacitor isolator.
Having relooked at Frans schematics and BK's posts I think? that I have misinterpreted them
IMHO the grounding in the phono amp should consist of two wires coming from the INPUT connection on the PCB (can use the second pair of input pads for that) to te grounding post, and there should be no resistor/capacitor isolator there. Rather, connect the p/s ground to that post as well, making it your star ground connection.

Let us know if that works, thanks
__________________
Paradise documents are here: Link list
  Reply With Quote
Old 20th September 2013, 09:54 AM   #2865
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
Thank you Alfred I will try your suggestions over the weekend.
  Reply With Quote
Old 20th September 2013, 06:36 PM   #2866
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Hi Marra.... simple but effective... do not connect circuit minus to mains earth... leave it floating.... that will cure any hum.

Connect TT arm ground to circuit (minus) (as long as TT arm gnd is not connected to mains earth.

Mains earth should be used only for security reasons and only in the psu case and using two parallel inverted diodes.

Amplifier case should be connected to circuit minus and disconnected from mains eart.
__________________
RC
  Reply With Quote
Old 20th September 2013, 07:22 PM   #2867
hesener is offline hesener  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Munich, Germany
Quote:
Originally Posted by RCruz View Post
Hi Marra.... simple but effective... do not connect circuit minus to mains earth... leave it floating.... that will cure any hum.

Connect TT arm ground to circuit (minus) (as long as TT arm gnd is not connected to mains earth.

Mains earth should be used only for security reasons and only in the psu case and using two parallel inverted diodes.

Amplifier case should be connected to circuit minus and disconnected from mains eart.
Ricardo, with all due respect, but I tend to disagree, for the reason you cite - security. I think you are setting yourself up for a dangerous electrical accident if you have no connection to mains earth, in your entire system. (And I don't think it is a cure-all for hum problems, either).

I know that many systems do without ground, some have "accidental" grounding through one of the components of the system, etc etc - all examples for not-so-great grounding schemes, in my opinion, apart from the apparent lack of security.

One very effective way is, as you mention, the back-to-back diodes between mains-earth and system ground. And,, these should not be 1N4004's, but big, robust power diodes e.g. RURG80100 or similar, so beefy that they will survive the accident and cause fuses to blow, not the diodes.
__________________
Paradise documents are here: Link list
  Reply With Quote
Old 20th September 2013, 07:33 PM   #2868
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Quote:
Originally Posted by hesener View Post

One very effective way is, as you mention, the back-to-back diodes between mains-earth and system ground. And,, these should not be 1N4004's, but big, robust power diodes e.g. RURG80100 or similar, so beefy that they will survive the accident and cause fuses to blow, not the diodes.
That is what I meant... maybe I did not explain very well.... The PSU must be connected to mains earth using two diodes back to back, but the amplifier case can be left floating as the voltages there are not lethal.

TT ground should go to the amplifier case and circuit minus, and should be isolated in regards to mains earth to avoid ground loops.

Me and FdW did a good study about that and posted a good solution.
__________________
RC
  Reply With Quote
Old 21st September 2013, 04:30 AM   #2869
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
In this case circuit minus is in reality circuit ground, not the negative rail obviously

And this is not a cure for all... one should also look for other potential loops in the system.
Attached Images
File Type: png GroundLoopABCD EDIT.png (71.9 KB, 325 views)
__________________
RC
  Reply With Quote
Old 24th September 2013, 09:02 PM   #2870
miepa is offline miepa  Austria
diyAudio Member
 
Join Date: Aug 2012
any pics of boards which used the V-Caps in the RIAA?
just wondering how you guys installed them on the board.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Paradise phono stage hesener Group Buys 1315 11th August 2014 10:37 PM
DIY Paradise - Any good to buy from? gingerpimp0069 Vendor's Bazaar 7 21st June 2007 02:07 PM
DIY Paradise Charlize Jolojl Swap Meet 7 7th December 2006 06:42 AM
Diy Paradise! alexmoose Tubes / Valves 3 24th July 2006 04:37 AM
Another way to paradise ? Bernhard Pass Labs 3 8th August 2003 10:19 PM


New To Site? Need Help?

All times are GMT. The time now is 07:20 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2