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

Class D Switching Power Amplifiers and Power D/A conversion

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 11th April 2006, 05:10 AM   #11
snkby is offline snkby  United States
diyAudio Member
 
Join Date: Jun 2005
Location: northern california
Default there is no center-tap on the xformer as

far as i can see.

i didnt leave anything out of the schematic except for the 1megohm resistor and .01muf cap across each cap.

i have another xformer by the same company that does have a 18v-0v-18v secondary but its labelled just like that.

should the shield be tied to 0v of the secondary ?

i dont know if you can see the drawing clearly enough on the web.

the middle post between the 0v and 61v is 40v.

0v-40v-61v.

could it be a bad rectifier ?
__________________
if it aint broke.........tweak it !!
  Reply With Quote
Old 11th April 2006, 05:20 AM   #12
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
center tap =0V

Check it with your meter on Vac from the rails. You need symmetry here. Like +30 0 -30

I'm assuming the 0V is the center tap and not a true earth. The screen needs to be connected to true earth, if not you will get an unbalance.

By the way how were your other transformers wired anyway?
  Reply With Quote
Old 11th April 2006, 06:29 PM   #13
snkby is offline snkby  United States
diyAudio Member
 
Join Date: Jun 2005
Location: northern california
Default the other psu that

is working right now uses 2 separate xformers with 2 separate rectifiers.

each xformer feeds a rectifier that feeds a cap.

the caps are then in series for the +/-45v with the series point between the caps as the 0v/ground reference.

can i parallel the ac from the 0v-61v to 2 rectifiers and then feed the 2 dc voltages to 2 caps like in the working psu ?

thanks.
__________________
if it aint broke.........tweak it !!
  Reply With Quote
Old 12th April 2006, 03:40 PM   #14
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Default Re: the other psu that

Quote:
Originally posted by snkby
is working right now uses 2 separate xformers with 2 separate rectifiers.

each xformer feeds a rectifier that feeds a cap.

the caps are then in series for the +/-45v with the series point between the caps as the 0v/ground reference.

can i parallel the ac from the 0v-61v to 2 rectifiers and then feed the 2 dc voltages to 2 caps like in the working psu ?

thanks.

No because you'd be getting >60V a rail.

I think what you need to do is bite the bullet and buy or find a proper transformer for the job. It doesn't seem like this one here is it.
  Reply With Quote

Reply


Hide this!Advertise here!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
How do opamps behave open loop? leadbelly Solid State 6 11th August 2009 05:07 PM
UcD modules - can the modules work without the input op-amp? beppe61 Class D 8 11th October 2006 07:35 AM
My new amp have a strange behave help! Progg70 Analog Line Level 5 17th October 2005 06:54 PM
oups! linear regulators of the same type may behave pretty different noisewise! Dominique Power Supplies 5 30th April 2005 01:34 PM
What do uncompensated amps behave? tmblack Solid State 39 21st March 2005 05:31 AM


New To Site? Need Help?

All times are GMT. The time now is 02:10 PM.

Page generated in 0.08296 seconds (73.45% PHP - 26.55% MySQL) with 10 queries

Copyright ©1999-2012 diyAudio