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Old 25th September 2008, 07:08 PM   #1
CJ900RR is offline CJ900RR  Sweden
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Question PA150 PCBs, is there any interest

I have been playing on my boards for a while now and I am really pleased with the result. I have also delivered 250 pieces to members on a Swedish internet-forum, www.faktiskt.se and the response has been nothing but happy faces.

I'm thinking of ordering more boards now because people in Sweden has been asking for it, so I might as well ask if there is any interest world-wide also. NOTE: This is not a groupbuy, I just wants to see how big the interest are so I can guess how many boards I need to order.

Facts about the board:

3pcs LM3886 in parallel configuration, non-inverted
Servo-circuits to null the DC-offset, instead of cap's
Buffer circuit to keep the input impedance high
On-board voltage regulators (LM317T and LM337T) for the +15V/-15V for the op-ams

PCB is 2-layer, 1.6mm thick and 70um copper-weight
Size is 6.4 X 2.7 inch, or 16.255 X 6.858 cm

No measure has been done since I don't have the tools, but this is the best "Gainclone" I have ever built, and there has been a lot of them.

Power in theory is somewhere around 150W into 4ohm, 50W into 8ohm. But if you bridge two board as I do, and recommend that you do, then you'll get something like 325W into 4ohm, 170W into 8ohm. Everything depends on voltage and the capability that the selected power supply has...

Images. First, empty board:

Click the image to open in full size.

Close-up of where the voltage regulators should be, not assembled in these images:

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Connectors can be Faston-type or ordinary screw-connectors, or anything with 5.08mm (0.2 inch) leg-space:

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Close-up of buffer and one servo-circuit:

Click the image to open in full size.

Overview of assembled board (voltage-regulators missing):

Click the image to open in full size.

To get as close to the pins as possible the caps is assembled directly on power-pins:

Click the image to open in full size.

So... is there any interest here? Let me know...
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Old 25th September 2008, 07:51 PM   #2
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Location: Calgary, Alberta
I'm interested, if shipping over the big pond is OK
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Old 25th September 2008, 08:00 PM   #3
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Im interested. I have a stack of unused LM3886s I need to do something with.
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Old 25th September 2008, 08:14 PM   #4
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Count me in! I haven't tried the 3886 before and I think this is the best time to do it. Can you post the BOM?

Cheers,

Fred
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Old 25th September 2008, 09:23 PM   #5
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Join Date: Oct 2004
Location: Denmark
I might be interested.

Looks like a great design and layout.
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Old 25th September 2008, 09:32 PM   #6
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I'm interested too, if price + shipping to Australia is reasonable
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Old 26th September 2008, 12:02 PM   #7
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
almost 4Mb of pic in one post.
What are you playing at?
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Old 26th September 2008, 12:32 PM   #8
CJ900RR is offline CJ900RR  Sweden
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Quote:
Originally posted by AndrewT
almost 4Mb of pic in one post.
What are you playing at?
Define "playing at"...

Pics hosted at my own server. Is it to much for your 46K modem or what are you applying?
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Old 26th September 2008, 02:29 PM   #9
AndrewT is offline AndrewT  Scotland
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Playing at = enormous posting without thinking about the download speed of many Forumites' Internet links.
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Old 26th September 2008, 03:35 PM   #10
enzoR is offline enzoR  Netherlands
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i might be interested. Is this standard schematic, non-inverted design?
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