Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Power Supply Resevoir Size
Power Supply Resevoir Size
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 9th August 2012, 10:57 AM   #441
liching1952 is offline liching1952  Switzerland
Banned
 
Join Date: Aug 2012
there is a scheme with 5000uF before the C multiplier, 1000uF after and 2x 500uF in the circuit, put all C together make 7000uF, throw away the circuit and the amp will work properly and better,
  Reply With Quote
Old 9th August 2012, 11:11 AM   #442
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by liching1952 View Post
No profesional will do this.
http://www.diyaudio.com/forums/loung...ml#post3058676

(for an MSc, teaching at university, your written English is appalling bad)
__________________
Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
  Reply With Quote
Old 9th August 2012, 11:14 AM   #443
Terry Given is offline Terry Given  New Zealand
diyAudio Member
 
Join Date: Mar 2008
Liching, a Constant Voltage Transformer is a form of ferroresonant voltage regulator. Transformer & Inductor Design Handbook (1,2,3rd ed) by McLyman has a decent description & design procedure. its an old technology, and I dont think its been mentioned in a textbook for 30+ years. they really do maintain a constant output voltage for varying input voltage and load.
  Reply With Quote
Old 9th August 2012, 11:19 AM   #444
liching1952 is offline liching1952  Switzerland
Banned
 
Join Date: Aug 2012
Quote:
Originally Posted by jacco vermeulen View Post
http://www.diyaudio.com/forums/loung...ml#post3058676

(for an MSc, teaching at university, your written English is appalling bad)
English is not my mothers tonque. How is your German? Of zullen wij het verder in het Nederlands doen?
  Reply With Quote
Old 9th August 2012, 11:26 AM   #445
Terry Given is offline Terry Given  New Zealand
diyAudio Member
 
Join Date: Mar 2008
Andrew, yeah, hence my earlier comment about a unity power factor boost regulator. Its quite possible to make one of them 97% efficient (the best I've seen to date is 99.3%) and at these low voltages it should be fairly easy* to get going (* yeah right)

for the truly brave I'd suggest an offline PFC flyback with dual outputs. not easy to design, and ever so slightly lethal to debug. there is also the minor issue of EMI. at 100W the input EMI filter needs on the order of 80dB attenuation at 150kHz. and then there's the regulatory hurdles....*sigh*.
  Reply With Quote
Old 9th August 2012, 11:27 AM   #446
jacco vermeulen is offline jacco vermeulen  Netherlands
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
You could check my written skills at German at the analog-forum.de, or ask some German members here just how well I do verbally.
(I suck at Dutch)

At this "serious forum", folks will not take you very serious, if you continue to write in chicken English.
__________________
Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
  Reply With Quote
Old 9th August 2012, 11:31 AM   #447
liching1952 is offline liching1952  Switzerland
Banned
 
Join Date: Aug 2012
Quote:
Originally Posted by Terry Given View Post
Liching, a Constant Voltage Transformer is a form of ferroresonant voltage regulator. Transformer & Inductor Design Handbook (1,2,3rd ed) by McLyman has a decent description & design procedure. its an old technology, and I dont think its been mentioned in a textbook for 30+ years. they really do maintain a constant output voltage for varying input voltage and load.
I know this, it uses a leaking transformer resulting a serial inductance. Its the same as an inductance between rectifier and cap filtering out the ripple. However the voltage is lower and thus gives lower amp performance
  Reply With Quote
Old 9th August 2012, 11:36 AM   #448
liching1952 is offline liching1952  Switzerland
Banned
 
Join Date: Aug 2012
Quote:
Originally Posted by jacco vermeulen View Post
You could check my written skills at German at the analog-forum.de, or ask some German members here just how well I do verbally.
(I suck at Dutch)

At this "serious forum", folks will not take you very serious, if you continue to write in chicken English.
Its up to you to take me serious or not. As a matter of fact most Swiss citizen doesnt take Dutch serious met hun grote mond.
  Reply With Quote
Old 9th August 2012, 11:49 AM   #449
liching1952 is offline liching1952  Switzerland
Banned
 
Join Date: Aug 2012
question, why are you people so demanding of a stable voltage? In a good Amp design supply variations is not transmitted to the speaker.
  Reply With Quote
Old 9th August 2012, 11:57 AM   #450
Terry Given is offline Terry Given  New Zealand
diyAudio Member
 
Join Date: Mar 2008
Quote:
Originally Posted by liching1952 View Post
I know this, it uses a leaking transformer resulting a serial inductance. Its the same as an inductance between rectifier and cap filtering out the ripple. However the voltage is lower and thus gives lower amp performance
sort of, but you left out the saturating portion (which is the important part). it can be modelled as an LC filter followed by a saturable transformer. and whilst off-topic, it follows from the constant-droop saturable inductor I proposed earlier.

alternatively the leakage inductance could be cancelled out by series-resonance.

none of these are really serious solutions (although I imagine they would look kinda neat, and could probably be used to extract cash from audiophools). obviously a better approach is to use a very low leakage transformer, size the cap bank appropriately and use a decent layout.
  Reply With Quote

Reply


Power Supply Resevoir SizeHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How do you calculate choke size in a power supply? Burnedfingers Power Supplies 28 19th July 2017 09:03 AM
Valve power supply - How to size transformer? SanderW Power Supplies 25 4th January 2013 05:12 PM
power supply bypass cap size BigE Power Supplies 11 5th July 2011 03:59 PM
Power Supply Case Size diymixer Power Supplies 1 10th October 2010 06:47 AM
What size power supply should I get for repair work? spooney Car Audio 3 7th December 2007 12:50 AM


New To Site? Need Help?

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


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki