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Old 23rd April 2011, 05:16 PM   #1801
PauloPT is offline PauloPT  Portugal
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I too agree with Fotios and AndrewT. But these past few years there was so much pressure from commercials by credit companies, to get that loan for the new car or the dream hollidays or the new LED TV or what ever - that people were made believe that this way of living was fine. On TV, newspapers, outdoors, website banners - you just couldn't miss the credit advertising! Add that to an economy that doesn't grow for the past 10 years and you get an explosive mixture. We have now to DIY our way out of this. And I believe we will!
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Old 23rd April 2011, 05:32 PM   #1802
fotios is offline fotios  Greece
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Lets get some fun, it is Easter time. When you don't have money left over, you make PCBs at home . Here is the main PCB of preamplifier, presented in 3 pictures showing the process: In the first two you can see the PCB from both sides, drilled and cleaned before the tinning of power tracks and the soldering of the 27 via holes. After this, the PCB is cleaned again and is ready for varnishing. The final result is presented at the 3rd picture.
Have fun and Happy Easter !
Attached Images
File Type: jpg PCB_COMPOSIDE.jpg (463.0 KB, 1707 views)
File Type: jpg PCB_SOLDERSIDE.JPG (513.3 KB, 1613 views)
File Type: jpg PCB_VARNISHED.jpg (401.1 KB, 1518 views)
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Old 23rd April 2011, 05:42 PM   #1803
fotios is offline fotios  Greece
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Quote:
Originally Posted by smartx21 View Post
Don't worry, be happy!
Nice musical eggs!
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Old 23rd April 2011, 06:35 PM   #1804
PauloPT is offline PauloPT  Portugal
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Beautifull!
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Old 23rd April 2011, 08:20 PM   #1805
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Sorry, eggs aren't mine. I only intended to say HAPPY EASTER to you all.
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Old 24th April 2011, 12:04 PM   #1806
AndrewT is offline AndrewT  Scotland
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Hi,
What is the green finish on the 3rd pic?
Is it solder resistant?
Why are a few traces a different shade of green?

There are solder pads on both sides. Do you intend soldering each through hole lead to both sides to mimic a PTH?
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Old 24th April 2011, 06:01 PM   #1807
fotios is offline fotios  Greece
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Quote:
Originally Posted by AndrewT View Post
Hi,
What is the green finish on the 3rd pic?
Is it solder resistant?
Why are a few traces a different shade of green?

There are solder pads on both sides. Do you intend soldering each through hole lead to both sides to mimic a PTH?
Hi Andrew
The green finish, it is not solder resistant. It is obtained with the use of a polyurethane based insulating - encapsulating transparent green varnish in spray can. It melts very easy with the tip of a soldering iron.
Traces that presents a different shade of green, simply are tinned before the varnishing.
Yes, i use spare lead wires from soldered parts for the via holes.
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Old 24th April 2011, 06:27 PM   #1808
fotios is offline fotios  Greece
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Quote:
Originally Posted by AndrewT View Post
Hi,
What is the green finish on the 3rd pic?
Is it solder resistant?
Why are a few traces a different shade of green?

There are solder pads on both sides. Do you intend soldering each through hole lead to both sides to mimic a PTH?
Here you can see the layout. Green tracks are on the component side and red tracks on the solder side. In practice, parts are soldered either from the component side or from the solder side (as it suits).
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File Type: jpg PCB LAYOUT_1.jpg (806.9 KB, 1363 views)
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Old 24th April 2011, 06:55 PM   #1809
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2 x 1000W/4Ω
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Old 24th April 2011, 07:48 PM   #1810
kct is offline kct  Canada
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Federmann,

sweet man, 2 x 1000W/4Ω, bridged I am assuming, can you post some cool pix of the power supply and perhaps the wrapping of the whole unit ?

Real PBW's, how refreshing for a change

Superb job

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