Is this Gonna Work?!? - 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 9th February 2013, 10:24 AM   #1
diyAudio Member
 
Join Date: Oct 2012
Default Is this Gonna Work?!?

Hi All

I have come up with this design for a filtered and regulated PSU.

Really looking for pointers suggestions and the like.

Quite new at this so any suggestions would be really great.
Attached Images
File Type: png New.png (9.5 KB, 90 views)
  Reply With Quote
Old 9th February 2013, 10:32 AM   #2
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Looks good. Just a couple of comments:

Nice touch to snubber the primary - but make sure the caps are rated for the PEAK value! Probably easier to snubber at the secondary though, you get some free attenuation from the transformer.

What current should this provide? 2 x 10kuF seems excessive and will result in quite high-and-short charge current pulses with lots of harmonics.

In the regulator you use the pot as a rheostat. That's fine but I would connect the bottom pin to the wiper. That way, if the wiper fails, it will not be open.

jan
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 9th February 2013, 10:40 AM   #3
diyAudio Member
 
Join Date: Oct 2012
Hi Jan

It needs to put out about 3 amps at 12v.

To be honest I just happen to have the 10KuF Caps so thought I'd use them!

What would you recommend?

I'll connect the wipper as suggested.

I assume when you say 'snubber' you mean the mains filter before the primary? Should I just move all of that over to the secondaries?

Many Thanks

Neil

Last edited by NeilParbrook; 9th February 2013 at 10:42 AM.
  Reply With Quote
Old 9th February 2013, 10:42 AM   #4
diyAudio Member
 
Join Date: Oct 2012
Another thing I was thinking of doing was duplicating the regulator circuit to give me two 12v 3 amp outputs.
  Reply With Quote
Old 9th February 2013, 11:02 AM   #5
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
You could usefully put a snubber across the secondary, perhaps 0.1uf and 2.2 ohm. Keep the primary ones.

Large reservoir caps is one my concerns in many many designs. I did a brief explanation only this morning, post #12,
STK4044 Power up.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 9th February 2013, 11:20 AM   #6
diyAudio Member
 
Join Date: Oct 2012
So...Like This???
Attached Images
File Type: png PSU3.png (16.6 KB, 76 views)
  Reply With Quote
Old 9th February 2013, 11:36 AM   #7
diyAudio Member
 
Join Date: Oct 2012
To split it to two outputs instead of doing it as above should i split it at the secondaries with two rectifiers etc?
  Reply With Quote
Old 9th February 2013, 11:51 AM   #8
diyAudio Member
 
sofaspud's Avatar
 
Join Date: Nov 2005
Location: San Antonio
If each separate secondary can supply the needed amperage, you could duplicate the snubber and bridge and everything after. Paralleling the secondary as shown saves parts and real estate. I'm not sure it makes significant difference either way; separation may have the edge if the loads are wildly different.
__________________
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
  Reply With Quote
Old 9th February 2013, 11:57 AM   #9
diyAudio Member
 
Join Date: Oct 2012
The Loads are Identical. Two Identical Amps! I'll leave it as it is.
  Reply With Quote
Old 9th February 2013, 12:39 PM   #10
Ketje is offline Ketje  Belgium
diyAudio Member
 
Join Date: Dec 2012
Location: Flanders
Perhaps something like this I don't no if all that snubbering has much use.
By using two diodes there is less loss and thereby less heat from the rectifiers.With the currents in the same direction in the toroidals there is no saturaion of the core,more inductance left.
Why KF ,for a meter you don't use Kmm do you.So KF is simply mF .
Mona
Attached Images
File Type: jpg vdg.JPG (58.0 KB, 61 views)
  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
is this gonna work? temp123456 Chip Amps 3 14th December 2010 09:01 PM
You guys aren't gonna believe this Scanlines Car Audio 5 29th October 2008 09:56 AM
How are you gonna get that through the door? JRKO Multi-Way 12 3rd July 2004 05:34 PM
OK, whose gonna clone these? Jhovis Multi-Way 11 15th December 2003 11:41 PM


New To Site? Need Help?

All times are GMT. The time now is 11:41 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