Simple SE grounding - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 30th January 2011, 06:32 AM   #1
skipper is offline skipper  United States
diyAudio Member
 
Join Date: Apr 2007
Default Simple SE grounding

Hi Guys,

I've read the simple SE grounding instructions and several post but still have a question. I am using a metal top panel to mount my transformers, switches, etc. The SSE grounding instructions says to ground one input to the ground on the power socket. Everything else on the board are tied together through this input ground.
My question is this, from the input power socket, should I ground this to the metal top using a stud, and then run the input ground wire to the stud too?
Or will this create a grounding loop?
Most of the time when I have opened up a electrical box, there is a grounding lug on the chassis that all the grounds are run to. It seems like the metal panel would be the grounded path but perhaps creates grounding loops?
Thanks.
  Reply With Quote
Old 30th January 2011, 04:01 PM   #2
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
The PCB takes care of a lot of the ground issues you would have when building a point-to-point design. There are a few ways to ground the Simple SE, but there is really only one rule with respect to the PCB: ground it once and only once.

If you do as George suggests and use one RCA as the ground, then you are done. To eliminate any chance of ground loops through some other leg, put your safety ground stud near the RCA jacks.

If you want control over the ground stud location, isolate the RCA grounds from the chassis and use a separate wire from your ground stud to the PCB (which has an extra ground connection for this purpose).
  Reply With Quote
Old 30th January 2011, 08:20 PM   #3
skipper is offline skipper  United States
diyAudio Member
 
Join Date: Apr 2007
Ok, I think I got it. I did not realize there was a ground location on the board to use instead of grounding through the RCA.

Thanks!
  Reply With Quote
Old 1st March 2011, 06:10 AM   #4
skipper is offline skipper  United States
diyAudio Member
 
Join Date: Apr 2007
Default Just another question

Hi Guys,

Sorry to beat a dead horse but I still have more questions. From the attached picture, it seems that the input has plastic washers to isolate the input from the chassis?
If I plan on using the input as my only ground, should I not use the plastic washers on either input and just attach one ground wire to one of the inputs. Or do I use the plastic washers only on the input that I am not grounding?

Same for the speaker connectors, it seems like the chassis is supposed to be sandwiched between the two plastic round washers, like an insulator.

Now I am thinking maybe it is easier to isolate all the input and outputs and ground the board to a ground stud on the chassis.
What do most of you do?

Thanks just trying to get this right!
  Reply With Quote
Old 1st March 2011, 06:11 AM   #5
skipper is offline skipper  United States
diyAudio Member
 
Join Date: Apr 2007
Sorry, I don't think the picture attached here it is.
Attached Images
File Type: jpg IMG_7441 (Medium).JPG (50.4 KB, 176 views)
  Reply With Quote
Old 1st March 2011, 02:06 PM   #6
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Yes, the washers are meant to give you the freedom to choose your ground point. Leave one of the input terminals without a washer on the back, ensuring that the back makes good contact with metal (remove any paint). Or, just leave all the washers on and choose a convenient point to be your chassis ground. This is what I typically do.
  Reply With Quote
Old 4th March 2011, 05:47 AM   #7
skipper is offline skipper  United States
diyAudio Member
 
Join Date: Apr 2007
Thanks again!
  Reply With Quote
Old 8th March 2011, 08:14 AM   #8
diyAudio Member
 
wushuliu's Avatar
 
Join Date: May 2008
Location: Los Angeles
Ok let me get this straight as i'm a little confused from the light/dark green wiring diagrams: for non-cfb triode, i can just use an extra wire from one isolated input to ground stud on metal chassis, correct? I do not need to separately ground speaker terminals to chassis with another wire, right?
  Reply With Quote
Old 8th March 2011, 02:02 PM   #9
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
I'm a bit confused by your question, but you do need to separately ground the negative speaker terminals on each channel if you are not using CFB (which will get ground from the PCB). It's a safety issue. Making sure both OPT secondaries have a path to ground ensures that you don't get 100s of volts on the speakers if the insulation on one of the OPT windings ever fails.
  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
Simple SE Simple Power Drive? Skorpio Tubelab 1 5th May 2011 09:45 AM
Simple SE grounding problems.. hartze11 Tubelab 7 24th May 2010 04:33 PM
Simple SE Grounding Question SGregory Tubes / Valves 2 17th November 2009 11:35 AM
Simple SE grounding -- metal spacers/standoffs? dogfish Tubes / Valves 4 26th June 2009 04:26 PM
Grounding Question on Simple System collinbd Multi-Way 0 30th November 2004 05:27 PM


New To Site? Need Help?

All times are GMT. The time now is 07:05 PM.


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