Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

External Powersupply and virtual grounds..
External Powersupply and virtual grounds..
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
Thread Tools Search this Thread
Old 5th September 2004, 08:24 PM   #1
PederBass is offline PederBass  Sweden
diyAudio Member
Join Date: Mar 2004
Location: Bors Sweden
Send a message via ICQ to PederBass
Default External Powersupply and virtual grounds..

Tried to search but didn't find anything useful..so:

If u had to have an external powersupply,which one would u prefer:

1. only trafo and sending AC to the amp and do all regulating/filtering/rectifying there..or
2. complete dc-supply and just some additional filtering at the amp..

And my other q,....

Is there any real benefits to use a virtual ground other than that it's practical and preferable in battery-driven amps, but soundwise, does it makes things better?

Thanx guy's!


  Reply With Quote
Old 5th September 2004, 09:06 PM   #2
Quattor is offline Quattor  France
diyAudio Member
Quattor's Avatar
Join Date: May 2003
Location: Paris
From my experience its the best possible solution: transformer on the outside and everything else inside. Ive tried it with several versions of my preamp and it worked like a charm. This way, power supply its regulator parts are as close as possible to consumer circuits, shielded by the enclosure itself. Nowadays, this is the only way Im building my preamplifiers. As far as the power amplifiers are concerned, Im doing them classical way everything inside. No experiences with virtual ground, though.
  Reply With Quote
Old 5th September 2004, 09:24 PM   #3
mikeks is offline mikeks  United Kingdom
Account Disabled
Join Date: Jun 2004
Location: Animal farm
Originally posted by Quattor
From my experience its the best possible solution: transformer on the outside and everything else inside.....
Excellent idea....
  Reply With Quote
Old 7th September 2004, 09:59 PM   #4
cunningham is offline cunningham  United States
diyAudio Member
Join Date: Jun 2004
Location: Knoxville
There is a few specifics to be pondered when considering a virtual ground. First of all, how are you achieving your virtual ground. Are you using one power supply that has only + and -?
Using two resistors from +V to -V and creating a voltage divider to get a "ground" that is in the middle of the +V and -V? If this is the case, the virtual ground or 'floating ground' is a legitamate way to create a symetrical power supply. The only problem is that this is only a virtual ground, not a hard ground. This virtual ground will function wonderfully as a reference point, but not as a current source, as a hard ground would be. If you are making Op-amp circuits and occilators this idea will work well. You can't connect the speaker to it or get much current though. You should consider making a +V, ground, -V supply for this.

The real problem with mounting power transformers inside case with the circuit is the magnetic noise. This is really a problem if you are using any audio transformers in your circuit. The problem with mounting it outside is the length of wire running from the secondary to the amp and may require filtering inside and a thicker guage wire to handle the current spikes without the wire causing a voltage drop.
  Reply With Quote


External Powersupply and virtual grounds..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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
External powersupply for Aleph X Sander Pass Labs 4 6th December 2007 02:40 AM
External Control for Virtual DJ ZuMbAiU Digital Source 0 11th July 2006 04:46 PM
Multiple Grounds Wynand Chip Amps 12 4th December 2005 11:38 AM
Should grounds go like this? leander Solid State 18 17th November 2005 11:55 PM
PSU sharing grounds neutron7 Parts 2 5th March 2005 12:23 AM

New To Site? Need Help?

All times are GMT. The time now is 02:42 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio