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PostPosted: 06 Nov 2013, 08:04 
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Hello all,
Im planning to etch my PSU and amp boards for this awesome project and a couple of questions come to mind. What would be the optimum trace width for the AC in and B+? ...also, would the use of a ground plane be OK? How close can a ground plane be to B+ and not see any arcing? I will draw up a PCB and post it for critique, that may be easiest...

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PostPosted: 06 Nov 2013, 09:10 
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Hi , In this particular project the circuit is very forgiving. I personally like to use traces that are around 2mm wide or larger. A ground plane is fine but not needed as the gain is low and it uses high level signals. At the low B+ levels used arcing is not a big issue. Personally I would not bother with a ground plane, but if you want I would use about a 3-5 mm separation from other traces that handle the B+.

Your idea of posting the pcb diagram is a good one and we can all give it a look see.

Good listening
Bruce

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PostPosted: 06 Nov 2013, 20:29 
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Sir,
here is what I came up with...I included the expressPCB schematic to ID the parts, thank you... Rob
PS, if this board makes it to etch, the dimensions are 6.5" x 3"

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Image

highlighted GND
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PostPosted: 06 Nov 2013, 21:53 
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Hi, The only thing I see is that C12 and C13 should be connected right at the pins on the tube heater sockets. They can be low voltage ceramics or polys and most are quite small (about 5mm square typically).

Good layout on the board.

Good listening
Bruce

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PostPosted: 06 Nov 2013, 22:12 
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gofar99 wrote:
Hi, The only thing I see is that C12 and C13 should be connected right at the pins on the tube heater sockets. They can be low voltage ceramics or polys and most are quite small (about 5mm square typically).

Good layout on the board.

thank you sir... I will redraw and take the heater current from the board and point to point the caps directly to the tube socket pins...thanks for the advice on the size of the caps. I just bought handful of Wima polypropylene to keep the parts order simple, and I will post a pic of the redrawn board.

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PostPosted: 06 Nov 2013, 22:47 
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I think I have it this time...

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PostPosted: 07 Nov 2013, 09:24 
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Hi, Looks fine. Remember that the regulator in the heater circuit will get fairly hot. I use a small (about 1/2 inch on each side and 1 inch tall) "U" shaped heat sink on mine. In theory the regulator ought to be able to handle the power without it, but it is really close to the max without a heat sink. A cheap precaution.

Good listening
Bruce

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PostPosted: 07 Nov 2013, 15:49 
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Thank you sir,
another question... is there any orientation of the output transformers in relation to the main transformer that should be observed?

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PostPosted: 07 Nov 2013, 21:25 
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Hi, Yes to some extent. The best orientation is (one) as far away as is reasonable (two) the core laminations need to be at right angles to each other. so since the power transformer has a horizontal orientation the outputs ought to be vertical. The outputs themselves can have the same orientation as long as they are an inch or so apart.

Good listening
Bruce

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PostPosted: 09 Nov 2013, 20:50 
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gofar99 wrote:
Hi, Yes to some extent. The best orientation is (one) as far away as is reasonable (two) the core laminations need to be at right angles to each other. so since the power transformer has a horizontal orientation the outputs ought to be vertical. The outputs themselves can have the same orientation as long as they are an inch or so apart.

Good listening
Bruce


Thank you again sir,
I got my boards etched earlier this afternoon...they turned out good with a nice clean etch. I didn't think about the actual copper clad until today. The only stuff I have on hand is 1 oz copper foil on .060 laminate, I hope its adequate...anyway, I set down the traces at 2 mm. Here is a look at the finished boards. I wont get my parts until Thursday and the iron from Edcor is "in processing / production" and I have no idea how long that will take...

Image

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Image

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