Bricolo said:
Everything is to the right of the transformer. Signal stages, power amp, volume controls everything. I know exactly why it doesn't run the full length. Even if you dont' completely shield something a well placed partial shield can do most if not the whole job. I've done this with RF circuits on several occasions. I had sophisticated gear to tell me how I was doing with placement though. That amount of shielding was deemed good enough, so that's why it stops where it does.
Scott
Bricolo said:
Not quite. A shorted turn is a conductive path through the center of the toroidal transformer, around the outside, and then back to the center. If you can start at a point, say the mounting bolt, and you attach that bolt to the bottom of the chassis, AND the top of the chassis then you can draw a complete circle through the center of the transformer and it's a shorted turn. This is just like taking your outputs, shorting them together and then plugging them in. Transformer death is the result.
If you only attach the bolt to the bottom of the chassis and not the top, there is not complete circle through the transformer. No shorted turn.
Scott
fedde said:You can smell it...
Fedde
I asked this question because at the beginning of my gainclone project, I wired a PS cap in the wrong polarity
->BAM!
the cap "exploded", and the tiny cables it was soldered to had theyr insulation melted
my big mistake was that I didn't use a fuse on the mains. So, big currents can have flown thru the transformer, and I don't know if it's damaged (the amp still works now, after having changed the cap)
Never omit a fuse at the primaries of the toroids! In case of a short you risk fire in the toroids or melting of the internal fuse of the toroid. 
I don't think the toroid is damaged by the cap. You could measure the impedances of the primaries and secondaries. (and compare the measurements to your second toroid, if you have that...)
Fedde
I don't think the toroid is damaged by the cap. You could measure the impedances of the primaries and secondaries. (and compare the measurements to your second toroid, if you have that...)
Fedde
fedde said:Never omit a fuse at the primaries of the toroids! In case of a short you risk fire in the toroids or melting of the internal fuse of the toroid.
I don't think the toroid is damaged by the cap. You could measure the impedances of the primaries and secondaries. (and compare the measurements to your second toroid, if you have that...)
Fedde
Yes I know, now I always use a fuse
BTW, what are you meaning in "the internal fuse of the toroid"?
Peter: I see how the stand off are made, but what I want to know is how the bottom panel is done.
Have you drilled a hole and tapered it, so you can screw the stand off in it? If yes, did you drill a complete hole in the bottom panel (I mean a hole that goes to the exterior)
Peter Daniel said:
It also provides more "industrial" feel to the whole chassis
I was looking for a way to screw my gainclone chips to the sides, with the same method. But I don't want to see the hoes from the exterior.
but tapering even 2mm in a 4mm deep hole is impossible, at leat with my tools
Bricolo said:
I was looking for a way to screw my gainclone chips to the sides, with the same method. But I don't want to see the hoes from the exterior.
but tapering even 2mm in a 4mm deep hole is impossible, at leat with my tools
It seems like you are using 6mm panels, so this is close to 1/4" . I tapered #4 holes in that thick material (without going through) by using a tap which had the tip trimmed. It shouldn't be a problem.
Bricolo said:
In that case I would try to find a thin piece of surplus teflon to make sure that it never touches due to the toroid getting loose over time from vibration or any of the other reasons.
I doubt you killed your transformer with the caps, since transformers are made of metal and insulation they tend to be very tough devices when made well.
As a poster has already said use a DMM to check continuity and resistance...then check to make sure you're getting the right DC levels. If so, it's fine.
Scott
fedde: where is this fuse located? In the toroid itself??!!
I've found another solution that yours using "external pression, instead of internal pression" (If I understood your idea, you're thinking about clamping the transformer by using a bar and bolts that are outside the transformer, am I right?)
Peter Daniel: I'll try. Thanks for the idea
ScottRHinson: First, do you have a reference text that explains that we musn't have a metallical ring going thru the transformer's hole? You're the first that tells me about this (it seems quite logical, but you're still the first)
But I've found another solution as putting a teflon sheet:
A plastic bolt
I've found another solution that yours using "external pression, instead of internal pression" (If I understood your idea, you're thinking about clamping the transformer by using a bar and bolts that are outside the transformer, am I right?)
Peter Daniel: I'll try. Thanks for the idea
ScottRHinson: First, do you have a reference text that explains that we musn't have a metallical ring going thru the transformer's hole? You're the first that tells me about this (it seems quite logical, but you're still the first)
But I've found another solution as putting a teflon sheet:
A plastic bolt
Bricolo said:
If it's a strong enough part...to hold the transformer.
Here's one link to the mounting question....
http://avellindberg.com/transformers/tech_notes/tech_notes14.htm
here's a second.
http://www.amveco.com/Technical_Notes_7.htm
Scott
Bricolo said:fedde: where is this fuse located? In the toroid itself??!!
I've found another solution that yours using "external pression, instead of internal pression" (If I understood your idea, you're thinking about clamping the transformer by using a bar and bolts that are outside the transformer, am I right?)
Peter Daniel: I'll try. Thanks for the idea
ScottRHinson: First, do you have a reference text that explains that we musn't have a metallical ring going thru the transformer's hole? You're the first that tells me about this (it seems quite logical, but you're still the first)
But I've found another solution as putting a teflon sheet:
A plastic bolt
You can have metal going through the center. It just can't go through the center and all the way around and complete a circle.
Scott
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