Power Supply 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 22nd September 2008, 05:15 PM   #11
diyAudio Member
 
Join Date: Jun 2008
Dave, that's some solid advice and it had occured to me but the point is to get my feet wet with tube circuitry and I'm in no hurry to listen. I have a nice el34 Jolida going right now and sound is not a problem. I'm just out to futz around with this pig. I might fit it with a rectifier tube later on because I'd like to see if I can hear the difference so often attributed to the rectifier tube.

Mr. Navarro. That comment went right over my head, but I will research your ideas. Just not that familliar with ss power suppy circuits yet. Thanks for your input.
  Reply With Quote
Old 22nd September 2008, 06:02 PM   #12
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
capacitance multiplier

http://sound.westhost.com/project15.htm
  Reply With Quote
Old 3rd October 2008, 04:30 PM   #13
diyAudio Member
 
Join Date: Jun 2008
Default Filter cap values

I believe I will part out that Knight amp and use the tubes and output transformers on a future project and use the power transformer to make an adjustable B+ power supply for experimentation.

I've got all the pieces together and I'm ready to build the regulated power supply using the LR8 regulator and TIP50 transistor. (the schematic is posted in the thread a few post higher; post 8). I'll mount a pot so I can control the voltage.

But I do have a question. The drawing calls for using 20 and 40uf caps as filters. I have some 220uf 400V snap in caps that I would like to use. What are the pros and cons of using more capacitance that is needed in a filter role?
  Reply With Quote
Old 3rd October 2008, 06:28 PM   #14
diyAudio Member
 
Join Date: Jul 2006
Significantly increasing the power supply capacitance can lead to inrush current problems as the caps are energized. Series inrush limiters are available; I don't suggest simply replacing the fuse (you have installed a fuse, right?) with a higher-current one.

-k
  Reply With Quote
Old 3rd October 2008, 07:20 PM   #15
diyAudio Member
 
Join Date: Jun 2008
Ok, that is the explaination I was looking for; the con of excessive capacitance.

I have other smaller caps that I can use and will do so. I was thinking this might be an opportunity to use these larger caps.

Also, one frequently sees large caps at bargain pricing and it's always tempting to by them instead of their pricier smaller counterparts.

Thanks for your comment, And yes, I have a fuse.
  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
Amp power supply question theAnonymous1 Solid State 12 30th August 2008 05:06 AM
813 power supply question Richard Ellis Tubes / Valves 6 14th December 2007 03:41 AM
Another Power Supply Question soundbadger Tubes / Valves 12 10th October 2007 12:29 AM
Power supply question HugoR Tubes / Valves 9 9th November 2005 08:34 AM
Power supply Question Adam M. Chip Amps 10 4th May 2005 02:19 AM


New To Site? Need Help?

All times are GMT. The time now is 04:08 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