The lego-technics transformer winding setup

svokke · 21st November 2003, 11:29 PM

I needed a pushpull OT for a 2*ECL82 guitaramp quick, I didn't want to spend any money on it and I have a lot of broken junk. So I took a competeley trashed transformer from a TOA PA amp(it came from a church that was hit by lightning, windings were molten together). Did the calculations, grabbed my favourite toys from 10 years ago and started winding by hand. A long afternoon winding with some nice music on the background...

EC8010 · 21st November 2003, 11:34 PM

That's wonderful! I'm lost for wo...

svokke · 21st November 2003, 11:40 PM

After winding +/- 2600 windings (400 left) I ran out of space. I was quite frustrated and didn't look at it for a week. Then I unwinded it using a drill and I re-winded it with less turns.
After lots of turns

Laminarions won't fit on it, too many turns

Unwind again with drill. Did 2000 turns primary now, now finally I've got a tight fit.

Now I'll look for some tests to see if it meets the expected specifications. I know it won't be hifi, but if it's as bad as I calculated, it would be perfectly OK for a low-power guitar amp

EC8010 · 21st November 2003, 11:47 PM

Who cares? You have a winding machine that Joel would be proud of.

fdegrove · 22nd November 2003, 12:25 AM

Hi,

Quote:

Who cares? You have a winding machine that Joel would be proud of.

ROTFLMAO.

You've just been awarded the "Best humour of the Year" award.

Geez, Svokke, don't Lego your fingers into the bobbin...

Cheers,

Paul Barker · 22nd November 2003, 01:23 AM

Firstly congratulations on actually a very utilitarian method.

Secondly your experience with fill rates is the best way to learn, I have wound many scrap bobbins this way to find out what if situations, then I make my notes and am armed with most useful empirical discovery's. The very best reference in transformer winding is the notes you write from your own empirical experience.

I don't ever unwind, bobins just cost 30 pence or so, I bin 'em.

li_gangyi · 22nd November 2003, 01:30 AM

save the enironment~!!! He's gonna get the green award...hey maybe you can try binding one of those lego motors on top...then using a rubber band (which they do supply) and a variable speed controller...auto wind ur bobbins...would really be nice...

21st November 2003, 11:34 PM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Lost for words. That's wonderful! I'm lost for wo... __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

21st November 2003, 11:40 PM	#3
svokke diyAudio Member Join Date: Apr 2003 Location: Leuven	After winding +/- 2600 windings (400 left) I ran out of space. I was quite frustrated and didn't look at it for a week. Then I unwinded it using a drill and I re-winded it with less turns. After lots of turns Laminarions won't fit on it, too many turns Unwind again with drill. Did 2000 turns primary now, now finally I've got a tight fit. Now I'll look for some tests to see if it meets the expected specifications. I know it won't be hifi, but if it's as bad as I calculated, it would be perfectly OK for a low-power guitar amp __________________ In illusion comfort lies

21st November 2003, 11:47 PM	#4
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	It's art! Who cares? You have a winding machine that Joel would be proud of. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

22nd November 2003, 01:30 AM	#7
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	save the enironment~!!! He's gonna get the green award...hey maybe you can try binding one of those lego motors on top...then using a rubber band (which they do supply) and a variable speed controller...auto wind ur bobbins...would really be nice... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

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22nd November 2003, 01:23 AM	#6
Paul Barker diyAudio Member Join Date: Aug 2003 Location: Scarborough	Firstly congratulations on actually a very utilitarian method. Secondly your experience with fill rates is the best way to learn, I have wound many scrap bobbins this way to find out what if situations, then I make my notes and am armed with most useful empirical discovery's. The very best reference in transformer winding is the notes you write from your own empirical experience. I don't ever unwind, bobins just cost 30 pence or so, I bin 'em.

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