Power Supply Help - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 3rd March 2008, 10:11 AM   #1
Shike is offline Shike  United States
diyAudio Member
 
Join Date: Jun 2007
Default Power Supply Help

Hello everyone,

I know there's probably some threads on this, but I've searched and am not completely sure where to start.

I want to build a five channel gainclone, using the LM3875. How do I go about selecting a transformer, rectifier, etc. Basically, how do I make a PSU in general . . . ?

My friend and I are in college and trying to build one, but we're completely lost when it comes to AC to DC rectification and meeting the power requirements.

Any links to guides, explanations, etc, would be greatly appreciated.
  Reply With Quote
Old 3rd March 2008, 10:22 AM   #2
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
I can only tell you what i believe and did . others will do things differently and disagree with me.

Power Supply

500VA 25 - 0 - 25 toroidal ( use 8 ohm speakers)


4 x 10000uF per voltage rail.
Stick to the standard national circuit for each chipamp.
Use BIG cheap 35A rectifier diodes to avoid current problems.

I added 100uF and a 0.1uF decouplings caps on each voltage rail pins in each chipamp.


For powersupplies:

read this website: http://www.tnt-audio.com/clinica/ssps1_e.html

For chipamp schematic:

Read the lm3886.pdf file on nationals website.

Pictures:

http://www.facebook.com/album.php?ai...0&id=607902362


After all of this Experiment , add decoupling caps everywhere , experiment with input noise filtering circtuits and so fourth.
  Reply With Quote
Old 3rd March 2008, 12:57 PM   #3
TheMG is offline TheMG  Canada
diyAudio Member
 
Join Date: Jan 2008
Most importantly, remember that the unloaded voltage output from the ps will be the secondary voltage of the toroid multiplied by the square root of 2. Keep that in mind when selecting the transformer voltage.
  Reply With Quote
Old 3rd March 2008, 01:04 PM   #4
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
Default Re: Power Supply Help

Quote:
Originally posted by Shike
.... Basically, how do I make a PSU in general . . . ?
...
Any links to guides, explanations, etc, would be greatly appreciated.
http://sound.westhost.com/power-supplies.htm
  Reply With Quote
Old 3rd March 2008, 01:23 PM   #5
diyAudio Member
 
Join Date: Sep 2006
Location: Wirral UK
This site has taught me a lot, but theres a lot to learn...

http://www.allaboutcircuits.com/
  Reply With Quote
Old 3rd March 2008, 10:57 PM   #6
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
This has about everything you need for basic linear PSU design, in a nutshell:

http://www.zen22142.zen.co.uk/Design/dcpsu.htm

But you should think about how the grounding will be done, to avoid hum. There are some recent threads discussing the differences between using one or two bridge rectifiers, one or two transformers, etc, for two channels, that should give you some insights about running five channels from one power supply. Check in the power supply forum, here, too, for those. Also do some searches, here, for 'star ground'.

Also, go to http://www.national.com , and do a search for AN-1192, and download AN-1192.PDF. It shows how to do the calculations to determine output power and safe operating area vs load & power supply voltages, etc.
__________________
The electrolytic capacitors ARE the signal path: http://www.fullnet.com/~tomg/zoom3a_33kuF.jpg
  Reply With Quote
Old 3rd March 2008, 11:04 PM   #7
Shike is offline Shike  United States
diyAudio Member
 
Join Date: Jun 2007
Hey, thanks everyone. I'll make sure to get reading then . . . it seems I have a lot of ground to cover.
  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
Split Voltage Switching Power Supply for Power Amp vectorplane Swap Meet 2 23rd April 2011 11:48 PM
LTspice tool for power amp power supply component evaluation andy_c Software Tools 2 23rd August 2009 05:10 PM
Can i use a computer power supply to power audio amplifiers? destroyer X Solid State 91 25th September 2006 04:36 AM
selling high current power supply for power amps. ericpeters Swap Meet 0 14th January 2005 02:21 PM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED? jarthel Tubes / Valves 10 21st July 2003 01:30 PM


New To Site? Need Help?

All times are GMT. The time now is 09:52 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