Powering an amp from just + and -? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 19th November 2002, 09:20 PM   #1
Default Powering an amp from just + and -?

Is there any way to power an amp that would othewise use a dual - 30 0 + 30 supply off just a single + and - supply?
  Edit/Delete Message Reply With Quote
Old 19th November 2002, 09:27 PM   #2
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
By that if you mean 0 and +, then the answer is yes.
A Zen is a good example.
  Reply With Quote
Old 19th November 2002, 09:30 PM   #3
Yeah because my amp is goin in a very small case and the transformer is going in a diff case for emi and such shielding so instead of trying to use a xr5 or whatever it's called 3 wire mic cable for my power i could just use a cord from my old playstation (now deceased) with the quick connecter in the amp and use only 2 conductors.

EDIT: i've been to your site and looked around and can't find any info on the ZEN....
  Reply With Quote
Old 19th November 2002, 09:55 PM   #4
diyAudio Member
traderbam's Avatar
Join Date: Jan 2002
Location: Earth
It is possible to build two amps and bridge them to achieve what you want. Some modifications will be needed to bias the input ground between the supply rails. You'd need to watch out for things like psu decoupling capacitors that originally connect to the 0V gnd and make sure their currents don't modulate the input ground.

I'm not sure what Nelson is talking about. I can't think of many ways to use a single split-rail amp without doing something nasty like a series cap to the speaker with the other end of the speaker tied to one of the supply rails.

  Reply With Quote
Old 19th November 2002, 09:58 PM   #5
diyAudio Member
Equilibrium's Avatar
Join Date: Oct 2002
Location: Mad Dog, Texas
Default Zen is single ended

In order to employ a 0 and + power supply wouldn’t your amp have to be single ended?
  Reply With Quote
Old 19th November 2002, 10:24 PM   #6
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
No. You can build a fine push-pull amp with just a
single supply.
  Reply With Quote
Old 20th November 2002, 01:19 AM   #7
Ackie! this amp is an STK hybrid with +VCC and -VEE and ground connections on the schematic,perhaps i should have mentioned that before....
  Reply With Quote
Old 22nd November 2002, 06:37 AM   #8
So theres no way?
  Reply With Quote
Old 22nd November 2002, 11:17 AM   #9
paulb is offline paulb  Canada
diyAudio Member
Join Date: Jun 2001
Location: Calgary
Your question should be: can I modify this amplifier to run from a single supply voltage?
Short answer: No.
Long answer: You could add a circuit to derive the midpoint of the supply voltage, and use that as ground. It's not worth it just to save a connector.
  Reply With Quote
Old 22nd November 2002, 11:22 AM   #10
diyAudio Member
Join Date: Sep 2002
Location: Sweden
The simplest way would be to use two electrolytics in series and
use the midpoint as ground. This works if regulated power
is not required, but just as paulb said, it is hardly worth the
cost if the only purpose was reuse an old connector and cable.
  Reply With Quote


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
Powering a fan for amp Buzzy Parts 8 9th September 2008 01:35 AM
Powering up/down Amp ptah Solid State 14 27th February 2008 06:54 PM
eqt not powering up! marko Car Audio 9 22nd August 2006 11:37 PM
Powering a car amp soundNERD Car Audio 14 29th June 2005 03:40 AM

New To Site? Need Help?

All times are GMT. The time now is 04:20 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2