Whats the best way to regulate a PS down? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

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
Reply
 
Thread Tools Search this Thread
Old 2nd December 2001, 03:58 AM   #1
diyAudio Member
 
Join Date: Oct 2001
I'd like my PS to be +-35V after rectification and the cap bank. However, its closer to 39V. How can I reduce voltage from the powersupply? would voltage dividing resistors do the trick? or is there some other better way?
  Reply With Quote
Old 2nd December 2001, 10:40 AM   #2
diyAudio Member
 
Join Date: Dec 2000
Location: Önnarp, Söderslätt
Is it a constant current, you're drawing from the PSU?
Is it a low or high current, your drawing?
Is the 39 Volt with or without load?

If it's not a constant current, but sometimes a high one, the problem is the small difference between the unregulated and regulated voltage, since the voltage drop-out(that's the the minimum difference between input and output needed, before the regulator's regulating) for a high-current regulator's typically 4-6 Volt.

In short: more info's needed.
__________________
Regards
Hoffmeyer ;0)
  Reply With Quote
Old 2nd December 2001, 11:52 AM   #3
diyAudio Member
 
Join Date: Oct 2001
Default Yeah sorry

I'm using it for an audio amplifier
its 39V without a load. Currents are slightly more than 1 amp per channel
  Reply With Quote
Old 2nd December 2001, 12:02 PM   #4
diyAudio Member
 
Join Date: Dec 2000
Location: Önnarp, Söderslätt
If the current's constant, and the PSU is not a total overkill, the voltage might drop a couple of volts, which brings it down to where it's difficult to use a regulator.

If the current's constant, you can use a small resistor, @ 0,47 Ohm, between two capacitors, a C-R-C filter.
__________________
Regards
Hoffmeyer ;0)
  Reply With Quote
Old 2nd December 2001, 12:36 PM   #5
diyAudio Member
 
Join Date: Oct 2001
How many watts?
Thanks
  Reply With Quote
Old 2nd December 2001, 01:33 PM   #6
diyAudio Member
 
Join Date: Dec 2000
Location: Önnarp, Söderslätt
P = I*I*R => P=½W + a safety-margin.
If I was You, I'd use at least 2Watt resistors.

C-R-C

GND

C-R-C
__________________
Regards
Hoffmeyer ;0)
  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
how to voltage regulate space2000 Solid State 4 12th April 2008 09:02 AM
CDP tweaking - which IC to regulate? mr_push_pull Digital Source 1 18th November 2007 01:36 PM
To regulate or not to regulate duderduderini Tubes / Valves 3 23rd October 2007 11:35 PM
Can't Regulate, Help! mikee55 Parts 7 7th January 2007 11:24 AM
To regulate or not? Ryssen Tubes / Valves 4 3rd April 2004 01:11 AM


New To Site? Need Help?

All times are GMT. The time now is 09:32 AM.


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