Transformer from Sony A/V Receiver - what's up with these windings? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 February 2007, 05:53 PM   #1
diyAudio Member
 
Join Date: Dec 2004
Location: Tennessee
Default Transformer from Sony A/V Receiver - what's up with these windings?

A friend gave me a transformer from a Sony A/V receiver. He didn't know the Sony model, I think it was 7 channels, or maybe 7.1, possibly 100 Watts per channel. I figure if Sony was claiming 7 channels of 100 Watts, it might be a good start for a 2 channel 100 Watt amplifier. Output devices are MP1620 / MN2488.

The secondary high current winding has 5 wires, with voltage as follows, measured with 120 VAC on primary, no load on secondary:

Orange - 44
Yellow - 27.4
Black - 0
Blue - 27.4
Red - 44

So, we have the makings of a +/- 62 VDC or +/- 38 VDC supply. According to my math, that would be about 240 Watts or 90 Watts into 8 ohms.

Anybody know how this thing was used? Guesses also welcomed.
Attached Images
File Type: jpg p2032107.jpg (58.7 KB, 229 views)
  Reply With Quote
Old 3rd February 2007, 09:58 PM   #2
diyAudio Member
 
XEAGLEKEEPER's Avatar
 
Join Date: Jan 2006
Location: central Iowa
Sounds about right. If there is a part number you could call sonys techline and maybe find out the VA rating?
__________________
Ret. USAF... AKA- Avionic *** Solder slinger for hire...***
  Reply With Quote
Old 3rd February 2007, 10:20 PM   #3
diyAudio Member
 
zeonrider's Avatar
 
Join Date: Mar 2004
Location: Belgrade RS
Default Hi !

Measured dimension of that transformator.
Maybe we can calculate VA rate(transform in mm ).
Regards zeoN_Rider
  Reply With Quote
Old 3rd February 2007, 10:34 PM   #4
diyAudio Member
 
XEAGLEKEEPER's Avatar
 
Join Date: Jan 2006
Location: central Iowa
Have you tried googling that part number?
__________________
Ret. USAF... AKA- Avionic *** Solder slinger for hire...***
  Reply With Quote
Old 3rd February 2007, 11:19 PM   #5
diyAudio Member
 
Join Date: Dec 2004
Location: Tennessee
Actually, what I was wondering about was the voltages - one pair seems too low for a 100 Watt amplifier, the other pair seems way too high.

I was hoping maybe someone had seen one of these before and knew what Sony did with those taps.
  Reply With Quote
Old 3rd February 2007, 11:26 PM   #6
diyAudio Member
 
XEAGLEKEEPER's Avatar
 
Join Date: Jan 2006
Location: central Iowa
Have a look at these amps
http://sound.westhost.com/project3a.htm 100watt 38vdc
http://sound.westhost.com/project101.htm 180-200 watt 66vdc
__________________
Ret. USAF... AKA- Avionic *** Solder slinger for hire...***
  Reply With Quote
Old 5th February 2007, 04:59 AM   #7
diyAudio Member
 
Join Date: Dec 2004
Location: Tennessee
Thanks for the amplifier recommendations XEagleKeeper, but allow me to drag this back on-topic:

Why are there two sets of taps on the secondary?
  Reply With Quote
Old 5th February 2007, 10:21 PM   #8
diyAudio Member
 
XEAGLEKEEPER's Avatar
 
Join Date: Jan 2006
Location: central Iowa
Probably because the sony required two different supply voltages.Real hard to say without a schematic!Possibly lower voltage for the preamp,flatamps and higher voltage for the poweramps???
__________________
Ret. USAF... AKA- Avionic *** Solder slinger for hire...***
  Reply With Quote
Old 6th February 2007, 04:33 AM   #9
diyAudio Member
 
Join Date: Dec 2004
Location: Tennessee
Hmmm. +/- 38 VDC is a bit high for a preamp, and I have no idea what a flatamp is (neither does Google ). And this is the high current winding - there is a separate low current winding measuring 14-0-14 that is almost certainly for the low-level stuff.

Thanks.
  Reply With Quote
Old 6th February 2007, 07:28 AM   #10
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
Voltages sound right for a 5-ch 100W class H amplifier.
__________________
Candidates for the Darwin Award should not read this author.
  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
Big transformer (pulled from Sony receiver) maurycy Swap Meet 0 1st December 2008 01:29 PM
Transformer Windings impsick Chip Amps 6 2nd February 2007 11:00 AM
transformer primary windings Q AndrewT Power Supplies 6 28th October 2006 11:51 AM
Unused HV windings on power transformer Bill*B Tubes / Valves 2 5th March 2005 09:42 PM
Transformer windings identifications - how to get it? Alfetta87 Solid State 7 21st February 2005 04:01 PM


New To Site? Need Help?

All times are GMT. The time now is 11:18 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