Pictures of your diy Pass amplifier - Page 173

Zen Mod · 9th March 2013, 01:02 AM

in that case - be sure that either screw is electrically isolated on one ( even better - both ) ends ..... or that your screen-bell is electrically isolated from bottom of case , so you are not having shorting turn through donut itself

wire in windings is also isolated from core , electrically ..... but not magnetically

sakellogg · 9th March 2013, 02:32 AM

I like the EEK! Means the same in any language.

coils · 9th March 2013, 03:39 AM

heres another option for high VA transformers, a cup under the can. Papa also said... somewhere, that he rotates the can for minimal elecrtromagnetic interference.

NSP · 9th March 2013, 08:11 AM

Hmm... I didn't know that there still are possibilities for the electrical loop when trafo center is "metal free", but now that you say it makes sense with the magnetism and all. Well I have to make myself a nylon bolt then.

AudioSan · 9th March 2013, 09:29 AM

i think i rather would use a metal bolt and nylon washers on the bottom and on the cover(like the ones you find on speaker binding posts)
it can be hard for the nylon bolt treads to hold down the transformer.

jacco vermeulen · 9th March 2013, 12:25 PM

Quote:

Originally Posted by sakellogg

I like the EEK!

I'd wait to say that till I was absolutely positive what it means in Serbian.

(Eek me, Z)

pcb121055 · 9th March 2013, 02:38 PM

Great work on the cover! Would the value of such a cover be to reduce stray fields or the transformer's mechanical noise?

jacco vermeulen · 9th March 2013, 02:45 PM

Quote:

Originally Posted by massimo

without the right tools

A piece of pipe can be bought by the cm/inch.
The lid can be made with a generic electric drill, a metal file, and patience.

Leaves the acetylene & oxygen bottles, and a lighter.

sakellogg · 9th March 2013, 03:07 PM

Quote:

Originally Posted by jacco vermeulen

I'd wait to say that till I was absolutely positive what it means in Serbian.

(Eek me, Z)

Uh good point.

CanAm Man · 9th March 2013, 03:21 PM

Quote:

Originally Posted by NSP

Hmm... I didn't know that there still are possibilities for the electrical loop when trafo center is "metal free", but now that you say it makes sense with the magnetism and all. Well I have to make myself a nylon bolt then.

Another option, to preserve the clean looks of the shield. Use a good silicone to bond the shield over/around the transformer. Silver solder a piece of wire or braid to the bottom edge of the shield, and run it to a good chassis ground (or just let the shield "float", ungrounded, if hum is not a problem). Result is a grounded shield, with no bolts/nuts showing in the top, and with no dreaded "magnetic loop" around the toroid core. Voila.

(Now, back to the "photos" in this Pass amp photo thread!.....

)

9th March 2013, 02:32 AM	#1722
sakellogg diyAudio Member Join Date: Nov 2008 Location: dixon ill	I like the EEK! Means the same in any language. __________________ I'm not crazy, my mother had me tested

9th March 2013, 09:29 AM	#1725
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	i think i rather would use a metal bolt and nylon washers on the bottom and on the cover(like the ones you find on speaker binding posts) it can be hard for the nylon bolt treads to hold down the transformer. __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers

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9th March 2013, 08:11 AM	#1724
NSP diyAudio Member Join Date: Nov 2007 Location: Vasa	Hmm... I didn't know that there still are possibilities for the electrical loop when trafo center is "metal free", but now that you say it makes sense with the magnetism and all. Well I have to make myself a nylon bolt then.

9th March 2013, 02:38 PM	#1727
pcb121055 diyAudio Member Join Date: Sep 2008	Great work on the cover! Would the value of such a cover be to reduce stray fields or the transformer's mechanical noise?