Power supply testing - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 8th March 2009, 06:27 PM   #1
diyAudio Member
 
Join Date: Feb 2009
Default Power supply testing

Hi, I am building a guitar amp and was wondering if I can test functionality of the power supply without anything attached to it or will it need a load? The HT/B+ line it 480v to the power stage anodes if that's any help.

Thanks for any help!
  Reply With Quote
Old 8th March 2009, 06:30 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
what would B+ rise to if no load is applied?

Is it a CRC type of PSU?
or an LCRC type?
The LCRC will rise to a very high B+, if there is no load.

Would that open circuit voltage be a problem for any of the capacitors?
__________________
regards Andrew T.
  Reply With Quote
Old 8th March 2009, 06:37 PM   #3
diyAudio Member
 
Join Date: Feb 2009
Its an LCRC design but i'm not sure how to work out the voltage without a load. All my caps are ~600v and I have 4 el34's and 8 ecc83's. Do I work out the off-load voltage by looking at the currents drawn?
  Reply With Quote
Old 8th March 2009, 07:35 PM   #4
athos56 is offline athos56  United States
diyAudio Member
 
athos56's Avatar
 
Join Date: May 2006
Location: Yakima, Washington
I was told one time that it was ok to read the voltage right off the bare transformer leads, and that the unloaded voltage would be a bit higher than normal. I am using some unknown transfromers in a project, I know around what they put out, but not exactly. I planned on building the circuit up until the first RC section. So only the C-LC sections. Then I'll work out where I'm at voltage wise. I think it should be ok to power up the PSU for limited periods as long as your caps are over rated a bit.
  Reply With Quote
Old 8th March 2009, 07:40 PM   #5
diyAudio Member
 
Join Date: Feb 2009
Well my transformer HT is rated at 340V 0.8A under full ohmic load and 4.5% regulation and therefore 480V after a bridge rectifier. Should I expect around 550V or so off load do you think?
  Reply With Quote
Old 8th March 2009, 07:52 PM   #6
athos56 is offline athos56  United States
diyAudio Member
 
athos56's Avatar
 
Join Date: May 2006
Location: Yakima, Washington
While I'm inclined to think that you won't have to worry about your 600v caps, I'd leave the definitive answer to some of the wiser people here.
  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
Power supply current limit for testing kubeek Solid State 1 12th February 2009 09:57 AM
Way of testing a speakers power rating? Gorbee Multi-Way 4 25th August 2006 11:41 PM
Power Tranistor Testing argonrepublic Chip Amps 4 14th January 2006 08:39 AM
Testing a power amp AndrewT Solid State 8 13th August 2005 03:43 PM
Power supply performance testing? How To Zero Cool Power Supplies 15 1st June 2005 01:25 PM


New To Site? Need Help?

All times are GMT. The time now is 06:53 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