Rectifier and DC filtering relationship question - Page 2 - 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 20th September 2013, 01:10 AM   #11
diyAudio Member
 
Join Date: Sep 2013
Location: USA
v on the c1 button?


Choose the value for C1?


I chose 10uF, just to see what it would do with a 5ar4. But I don't understand the graph...
  Reply With Quote
Old 20th September 2013, 03:06 PM   #12
zelgall is offline zelgall  Canada
diyAudio Member
 
Join Date: Aug 2005
Location: London. Ontario, Canada
Add a resistor or choke after the cap and add another larger cap after the R or L. The ripple will smooth out considerably.
  Reply With Quote
Old 20th September 2013, 03:12 PM   #13
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Quote:
Originally Posted by Bob Richards View Post
By the way, rectifier tubes are obsolete.
What? Do you know rectifier tubes are still being manufactured?
__________________
LW1DSE
  Reply With Quote
Old 20th September 2013, 03:48 PM   #14
diyAudio Member
 
Join Date: Sep 2013
Location: USA
Quote:
Originally Posted by zelgall View Post
Add a resistor or choke after the cap and add another larger cap after the R or L. The ripple will smooth out considerably.
Ok will do. But am I reading the graph correctly, that there's over 4v of ripple left on the DC, or does it not work like that?
  Reply With Quote
Old 20th September 2013, 05:23 PM   #15
zelgall is offline zelgall  Canada
diyAudio Member
 
Join Date: Aug 2005
Location: London. Ontario, Canada
Quote:
Originally Posted by Sea Biscuit View Post
Ok will do. But am I reading the graph correctly, that there's over 4v of ripple left on the DC, or does it not work like that?
You're reading it right but the design is incomplete. You need the other components to provide the filtering you want. With a single cap and nothing else, you will have very high ripple. It's just a few clicks of the mouse so give it a try.
See the attachment for an example. This isn't optimum, just showing an example.
Attached Files
File Type: doc example.doc (157.5 KB, 20 views)

Last edited by zelgall; 20th September 2013 at 05:34 PM.
  Reply With Quote
Old 20th September 2013, 06:36 PM   #16
diyAudio Member
 
Join Date: Sep 2013
Location: USA
Right. I do understand that it was incomplete. Was just an excercize in using that program... Thanks for the clarification on the graph.
  Reply With Quote
Old 21st September 2013, 01:40 PM   #17
diyAudio Member
 
Join Date: Sep 2013
Location: USA
Ok, playing around with the PSUD a little more. For guitar amp applications, what is an acceptable amount of ripple... 1v? .5v? Less, more? Just trying to get an idea of what is reasonable.. One thing to note, I don't like my amps sounding too "tight".




A second question, What are those wavey patterns that smooth out from left to right? They take up more of the graph in the second image with another filter added on. Is this a graph that accounts for time and that is what the forms look like when it's first switched on?
Attached Images
File Type: jpg PSUDsketch.jpg (356.1 KB, 71 views)
File Type: jpg PSUDsketch2.jpg (366.3 KB, 69 views)
  Reply With Quote
Old 21st September 2013, 02:24 PM   #18
drlowmu is offline drlowmu  United States
diyAudio Member
 
Join Date: Dec 2004
Location: 50 miles east of Kansas City, MO.
Quote:
Originally Posted by Sea Biscuit View Post
Ok will do. But am I reading the graph correctly, that there's over 4v of ripple left on the DC, or does it not work like that?
You selected and were showing I for C1 which is CURRENT in Amperes.

Select V for C1 which is VOLTAGE in VAC !!

Have fun learning. PSUD is cool.

Jeff
  Reply With Quote
Old 21st September 2013, 02:46 PM   #19
diyAudio Member
 
Join Date: Sep 2013
Location: USA
Yeah I did end up figuring that out.


How do I read the red lines for the power coming off of the rectifier in this image? It's all below zero?

And also, how do I determine if the R values are correct on the choke, caps, etc?
Attached Images
File Type: jpg PSUDsketch3.jpg (395.0 KB, 60 views)
  Reply With Quote
Old 21st September 2013, 07:58 PM   #20
diyAudio Member
 
Palustris's Avatar
 
Join Date: Aug 2006
Location: Cape Cod
Add a current tap in parallel with C2. That will represent the load established by your output tubes so use an appropriate current, say 100mA. R2 represents the driver stage and can be a current tap also instead of the resistor. You will then look at the voltage waveforms on C2 and C3 which are in parallel with the loads.
  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
Independant Inductive DC Filtering. smithomo Solid State 0 26th March 2012 05:24 AM
newbie question : driver/output relationship, input sensitivity mahleriana Tubes / Valves 1 17th August 2008 09:10 PM
dc-filtering-ac-power-station jh6you Power Supplies 57 3rd June 2007 08:09 AM
How much filtering required for DC heaters? RockysDad Tubes / Valves 2 27th February 2006 09:45 PM


New To Site? Need Help?

All times are GMT. The time now is 11:54 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