P.S idea - 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 18th December 2007, 01:12 PM   #1
noyan is offline noyan  Turkey
diyAudio Member
 
Join Date: May 2004
Location: istanbul
Send a message via Yahoo to noyan
Default P.S idea

Hi All,

My idea is like as follow;
-In general, tube amplifier P.S. units contain a big electrolytic cap after choke trans. This electrolytic capacitor is connected in serial between OPT and tube anode. Sound flows from this cap. It is effected on the sound quality, especially on mids and highs. I thought that, if i use another small choke filter bobbine serial to this big electr. cap, then only low (Bass) freqs. can pass on these circuit. For the mids and highs, i can connect two different valued PIO caps as parallel to this circuit. Mid and high freqs. will pass easily with less distortion trough these PIO caps. Cap values on the drawing are only for example. Any comment?
Noyan

Click the image to open in full size.
  Reply With Quote
Old 18th December 2007, 11:50 PM   #2
diyAudio Member
 
Join Date: Nov 2007
Unfortunately is not that simple.

For starters, a capacitor in series with an inductor forms a resonant circuit that will shunt the signal at the resonant frequency.
Additionally, all the other inductors and capacitors will also modify the overall frequency response.

If you have access to any sort of simulation software, please perform an AC simulation with the values you plan on using, and you'll be surprised at the oddball frequency plot.

Be sure to include equivalent series resistance of both the inductors and capacitors when you run the simulation.
  Reply With Quote
Old 19th December 2007, 12:46 AM   #3
jnb is offline jnb  Australia
diyAudio Member
 
Join Date: Dec 2006
Is the small choke and its capacitor meant to be tuned to the ripple frequency?
  Reply With Quote
Old 19th December 2007, 11:13 AM   #4
noyan is offline noyan  Turkey
diyAudio Member
 
Join Date: May 2004
Location: istanbul
Send a message via Yahoo to noyan
Default p.s. unit

The second choke and it"s cap is not for the cancellation of ripple. Their job is to pass only lower freqs. for example below 1khz. Over 1khz, other two PIO caps will play role. Anyway, i am concern like fernando_g about the low pass filter it will work as i wish or not. I mean they will play role as band pass filter or low pass filter.
Noyan
  Reply With Quote
Old 19th December 2007, 11:23 AM   #5
jnb is offline jnb  Australia
diyAudio Member
 
Join Date: Dec 2006
I agree with fernando_g. I think your supply would improve if you remove the small choke.

You will have a low pass filter using the large choke and 680uF capacitor. The PIOs might improve the high frequencies.
  Reply With Quote
Old 19th December 2007, 12:30 PM   #6
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
The idea is terrible because it comes from a brain that thinks in terms of false audio metaphysics rather than true circuit physics.

If you want to play games with LCR networks and win, you have to learn the physics and the math related to these LCR systems (the real rules of the game).
__________________
I use to feel like the small child in The Emperor's New Clothes tale
  Reply With Quote
Old 19th December 2007, 01:09 PM   #7
noyan is offline noyan  Turkey
diyAudio Member
 
Join Date: May 2004
Location: istanbul
Send a message via Yahoo to noyan
Default PS unit

If i remove small choke, then all spectrum of the sound will pass from these three caps. In this case, especially big elec. capacitor will try to pass trough the mids and highs then sound will be distorted.


Click the image to open in full size.
  Reply With Quote
Old 19th December 2007, 01:43 PM   #8
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
I think that what Eva was trying to say in his/her usual inimitable style was that you may have caused more problems than you've solved. You have a problem which is largely imaginary, and the means you have used to solve the nonexistent problem will almost certainly upset the dynamic stability of the supply. Run some simulations, and be sure to see what happens when you step the load current- I bet you'll see some astonishing ringing.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 19th December 2007, 01:55 PM   #9
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Quote:
Originally posted by SY
You have a problem which is largely imaginary

You can tell this to ARC as well. They might even have a patent for this.
Attached Images
File Type: gif ph3ps.gif (37.9 KB, 256 views)
  Reply With Quote
Old 19th December 2007, 02:16 PM   #10
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Wouldn't be surprised.

There's a reason I don't copy much from ARC designs...
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  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
Different pre amp idea bartek Solid State 3 25th March 2008 04:42 PM
I really have no idea what I'm doing here... d to the g Multi-Way 10 7th March 2008 07:04 PM
An idea! Fully balanced TDA1541A DAC idea. Please comment! cartman Digital Source 8 17th July 2007 09:18 AM
Just an idea bob123 Subwoofers 4 9th April 2006 03:28 PM


New To Site? Need Help?

All times are GMT. The time now is 05:47 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