Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles Store Gallery Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 13th June 2005, 07:05 AM   #1
wxn is offline wxn  Lithuania
diyAudio Member
 
wxn's Avatar
 
Join Date: Sep 2003
Location: Vilnius
Default Of what value is this trafo?

Taken out from an old Technics receiver, has center tapped secondary of about 2x20VAC. Could someone estimate rougly the power of this device?
Thanks
Attached Images
File Type: jpg traf_top.jpg (71.4 KB, 89 views)
__________________
Nothing is as simple as it seems
  Reply With Quote
Old 13th June 2005, 07:06 AM   #2
wxn is offline wxn  Lithuania
diyAudio Member
 
wxn's Avatar
 
Join Date: Sep 2003
Location: Vilnius
another pic
Attached Images
File Type: jpg traf_side.jpg (65.7 KB, 81 views)
__________________
Nothing is as simple as it seems
  Reply With Quote
Old 13th June 2005, 11:23 AM   #3
diyAudio Member
 
Join Date: Oct 2001
I would rate this transformer around 15VA

Leroy
  Reply With Quote
Old 13th June 2005, 11:34 AM   #4
wxn is offline wxn  Lithuania
diyAudio Member
 
wxn's Avatar
 
Join Date: Sep 2003
Location: Vilnius
Only 15VA? I hoped for at least 50...
__________________
Nothing is as simple as it seems
  Reply With Quote
Old 13th June 2005, 11:49 AM   #5
diyAudio Member
 
Join Date: Oct 2001
The only way to find out is testing the transformer: increase the output load step by step and monitor the output voltage and transformer temperature. Output voltage should not drop more than 10..20% and temperature should not exceed 60 degC
  Reply With Quote
Old 13th June 2005, 11:58 AM   #6
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
What was the power output of the amplifier from which this transformer was taken?

That should provide an estimate of the transformer's rating.
__________________
Frank
  Reply With Quote
Old 13th June 2005, 11:59 AM   #7
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
I'd say 15VA or less.... 50VA is physically much larger than that.
__________________
- Dan
  Reply With Quote
Old 13th June 2005, 12:08 PM   #8
wxn is offline wxn  Lithuania
diyAudio Member
 
wxn's Avatar
 
Join Date: Sep 2003
Location: Vilnius
Quote:
Originally posted by Frank Berry
What was the power output of the amplifier from which this transformer was taken?

That should provide an estimate of the transformer's rating.
IIRC it was 2x25W but delivered by a single STK4042 (or similat) mounted on a miserable heatsink...
Btw this trafo isn't so small, weights about 2kg
__________________
Nothing is as simple as it seems
  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
OPT Trafo Dynsdale Tubes / Valves 10 22nd March 2009 06:41 PM
Power supply options.. bigger trafo with less caps or medium trafo with heavy caps? rhythmdiy Chip Amps 9 23rd October 2007 12:30 AM
SE Trafo for PP use dsavitsk Tubes / Valves 15 8th August 2007 08:27 PM
trafo.. samsagaz Chip Amps 16 31st August 2004 02:17 PM
Trafo to buy for PWM amp partyjups Solid State 6 19th December 2001 10:32 PM


New To Site? Need Help?

All times are GMT. The time now is 10:32 PM.

Page generated in 0.08857 seconds (74.05% PHP - 25.95% MySQL) with 11 queries

Copyright ©1999-2012 diyAudio