Prof-check this schematic (Please!!!!!) - 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 29th August 2006, 05:45 AM   #1
diyAudio Member
 
ifrythings's Avatar
 
Join Date: Oct 2005
Default Prof-check this schematic (Please!!!!!)

I copied this schematic off of an ATX power supply, it's the stand-by circuit.

The transformer is a 1 primary, 1 feedback on the same side and one center tapped secondary.(I didn't have the right symbol in my program so I stuck two together)

Only other thing I notice was on the board they had a spot of a resistor going for the emitter of 2SC3150 to base of 2SC945. Any ideas what that mite of been for?
Attached Images
File Type: png power supply.png (19.6 KB, 427 views)
  Reply With Quote
Old 30th August 2006, 01:06 PM   #2
diyAudio Member
 
ifrythings's Avatar
 
Join Date: Oct 2005
Bump.

No one has any thoughts on this?
  Reply With Quote
Old 30th August 2006, 10:11 PM   #3
diyAudio Member
 
Join Date: Apr 2006
Location: Minnesota
Someone might comment on this if you show the transformer inductances or turns ratios. Further, the 103 and 151 caps don't make sense.
  Reply With Quote
Old 30th August 2006, 11:31 PM   #4
diyAudio Member
 
ifrythings's Avatar
 
Join Date: Oct 2005
151 is 15 +1 zero (0) so 150pF
103 is 10 +3 zero (0) so .010uF or 10nF

transformer inductance is: Feedback is 5.5uH, Primary is 4.42mH

btw most ceramic disc capacitors have the marking like 104, 103 things like that just in case you weren't sure.
  Reply With Quote
Old 12th September 2006, 04:46 AM   #5
diyAudio Member
 
Join Date: Jan 2005
Location: Sonoma, California
It looks like a self-oscillating switcher, not very efficient but cheap. I've seen a 25-watter using that scheme.
__________________
Koolkid
  Reply With Quote
Old 14th September 2006, 02:22 AM   #6
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
Quote:
Only other thing I notice was on the board they had a spot of a resistor going for the emitter of 2SC3150 to base of 2SC945. Any ideas what that mite of been for?
it is used to limit the base drive to the chopper trannie, you shouild use that.
  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
1.2kw amp schematic to check skaara Solid State 67 25th July 2012 07:12 PM
Schematic for check Jean-Paul_2 Everything Else 1 20th May 2007 01:02 AM
Check this schematic please CJ900RR Chip Amps 19 6th August 2006 09:34 PM
Prof. Plum in the library with a candlestick... hellblau Everything Else 2 8th January 2004 07:04 AM


New To Site? Need Help?

All times are GMT. The time now is 03:52 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