Class A power Supply - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 16th February 2012, 06:30 PM   #1
alibear is offline alibear  United Kingdom
diyAudio Member
 
Join Date: Feb 2009
Location: Somerset
Default Class A power Supply

Hi all,i am building a C-L-C power supplyfor a classA amplifier.The filter capacitors i have are new Epcos 47,000 at 40V and the transformer has secondaries of 25-0-25. After full wave rectifacation I am getting almost 37 volts when drawing a bias of 2 amps. My question is: is this too near the operating voltage of the capacitors for safety and long life and if so could I place a 1ohm resistor between the bridge and the first filter cap ( in both the positive and negative rail ) to reduce the voltage by a couple of volts or will this cause any problems.
Thanks for your help
alan
  Reply With Quote
Old 16th February 2012, 06:38 PM   #2
GloBug is offline GloBug  Canada
Banned
 
Join Date: Jun 2011
IMO which is almost worthless, you need a little more room for variations in power line voltages and potential surges.

50V or 63V caps would be ideal for a 25v transformer.

That being said, I had a Bryston here that had 49V rectified rails with 50V caps that ran daily for almost 30 years.

I guess it depends if the caps are conservative in their ratings.

Different caps would be my first choice, unless you find smoothing advantages in using the resistor. How many volts can you drop? You may find it impractical to get the voltages to the proper safety level without hindering performance.
  Reply With Quote
Old 16th February 2012, 06:41 PM   #3
diyAudio Member
 
bobodioulasso's Avatar
 
Join Date: May 2008
I wouldn'nt worry about 37v rails and 40v caps.
  Reply With Quote
Old 16th February 2012, 06:41 PM   #4
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
This resistors will degrade the supply regulation, and the capacitor working voltage is wright. Normally, the vent voltage is as 50% up the normal WV. Donīt care, and keep out these resistors.
__________________
LW1DSE
  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
Class D Power Supply??? Co_Driver Class D 19 17th December 2010 01:05 PM
Power Supply/Class D maverick_123 Power Supplies 3 30th November 2007 09:45 PM
Class D Power Supply kuda Class D 7 12th May 2006 07:58 AM


New To Site? Need Help?

All times are GMT. The time now is 08:17 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2