Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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
Thread Tools Search this Thread
Old 13th January 2004, 05:41 PM   #1
diyAudio Member
Join Date: Jan 2004
Location: City
Question Question for SE Transformer Gurus

Hi to all,

i made a diy output transformer-but there is something wrong with the design.
Please take a look at :


for explanation and photo.

Thank you very much,

  Reply With Quote
Old 14th January 2004, 07:40 AM   #2
diyAudio Member
Join Date: Nov 2003
Location: Genova, Italy

Also upload square wave responses of the
AN trafo.

This will make easier to help you.

( not me , since I do not know trafos )

  Reply With Quote
Old 14th January 2004, 08:55 AM   #3
diyAudio Member
Workhorse's Avatar
Join Date: Dec 2004
Arrow Reply

Thi phenomena is due to non interleaved windings.
Why are u not using INTERLEAVED WINDING ARRANGEMENT in ur TRansformer??
  Reply With Quote
Old 14th January 2004, 11:45 AM   #4
diyAudio Member
analog_sa's Avatar
Join Date: Aug 2002
Location: Sofia
Thi phenomena is due to non interleaved windings.
They are certainly interleaved and appear to be very well made. I sincerely doubt you'll get a lot of useful advice here. Why not try the tweakers asylum?
  Reply With Quote
Old 14th January 2004, 12:24 PM   #5
diyAudio Member
Workhorse's Avatar
Join Date: Dec 2004
Talking Mental Asylum

I think u dont have better understanding of INTERLEAVED WINDINGS yet. GO somewhere , Read books take some advice and update ur KNOWLEDGE
  Reply With Quote
Old 14th January 2004, 07:36 PM   #6
Jax is offline Jax  Sweden
diyAudio Member
Join Date: Nov 2003
Location: South Sweden
I'm not a transformer guru but to me the graphs seem to indicate that you have a lot of leakage inductance forming a resonance around 50 kHz with the stray capacitances.

Did you measure them with proper loads at both primary and secondary?

Leakage inductance can be caused by partly the relatively few interleavings and partly the low fill. Other factors could be the way you wound the two primary partitions. Did you start the two from the same end of the former or reversed?

I would try with more interleaving and use heavier wire for the secondaries instead of 3 thin trifilar. As a ballpark, 4 primary partitions in series (2 starting from one side of the former, 2 from the other) and 5 1.0mm wires secondaries. This should increase the coupling and thus reduce the leakage inductance. Try to fill the former as much as possible. (winding multifilar isn't bad though, just expensive. It's used in switching transformers for SMPS)

Your transformer looks nice, would be a shame if it didn't work.

I talked with transformer gurus many years ago, they all say you have to scrap the first 10 or so transformers before you get a grip over the magic of winding.

Just me 2 cents.

Edit: I forgot one thing, when measuring load the primary with the intended DC current.
  Reply With Quote


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
Need Advice from Amp Gurus Juke425 Class D 5 28th July 2008 03:20 AM
ppi a 600.2 hurtin, please help gurus Ken in AZ Car Audio 4 9th March 2007 08:08 PM
WinXP question for gurus. This is a tough one! mpmarino The Lounge 0 5th March 2006 03:15 AM
Quick crossover schematic question for you gurus :-) Florian Parts 2 1st November 2005 09:24 AM

New To Site? Need Help?

All times are GMT. The time now is 04:33 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