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Old 13th February 2007, 03:04 PM   #11
PMA is offline PMA  Europe
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Milan,

why do not you use non-solder mask and double-sided PCBs?
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Old 13th February 2007, 04:06 PM   #12
moamps is offline moamps  Croatia
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Hi Pavel!

If you take a closer look at my website, you'll see that I usually do use silk screen double-sided PCBs.

However, my Academia is still a prototype and I prefer to design, draw and etch all my prototype boards myself. One of the reasons is that I actually enjoy designing, drawing and etching my own boards, winding my own transformers, building my own cases, tweaking capacitors and pulling all sorts of crazy stunts like that in the line of DIY duty. Also, I truly enjoy experimenting with different concepts and take "the roads less traveled" so it is sometimes hard to tell in advance if a concoction of mine will ultimately make for a pleasurable listening experience. Therefore, I keep myself from spending too much money on expensive parts and/or professionally made PCBs until I'm positive that the prototype works well, as in the case of Academia.

Of course, it is a whole other story when it comes to my professional audio designs.

Regards,
Milan
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Old 13th February 2007, 06:07 PM   #13
PMA is offline PMA  Europe
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Hi Milan,

thanks for your clarifying reply.

Cheers,
Pavel
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Old 14th February 2007, 03:12 AM   #14
lineup is offline lineup  Sweden
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Default Lineup most Advanced HiFi Headphone Amplifier



Lineup most Advanced HiFi Headphone Amplifier

This headphone amplifier was built like 10 years ago.
Circuit, layout and everything is my very own idea & design.

As you can see,
I use direct solder HARDWIRE technique, as much as I can.
This is the theoretically superior method.
Not always easy and practical.
But good!

As well known:
There is no better quality electrical insulator, than AIR.
Not even some fancy plastic or epoxi variants Dupont or PFTEX Extra AudioPhile PCB boards!

Audio people may not know this, as often as Radio Amateurs do.
What is best quality Variable capacitors?
The Radio Amateur will tell you:
AIR Insulated variable capacitor.
This is The only option for a high performance.

He will not tell you using some plastic insulation cap.

Like PTFE or Polyproylene
No!

-------------------------------

Notice also my own custom HEATSINKS for output TO-126
Nice, isn't it?
These are BD139 / BD140 push-pull TRUE CLASS A followers.




Lineup Home Audio Amplifier Designs
/lineup - chief director of production line
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Old 16th February 2007, 01:53 PM   #15
mtlin12 is offline mtlin12  Taiwan
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Default New non-global NFB power amp

My new non-global NFB 50W power amp EU-50,

using my pre-amp module with voltage regulator ( EU-01)

and two +/-37V supplied power diamond buffers.
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Old 17th February 2007, 10:21 PM   #16
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My entry............
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Old 17th February 2007, 10:24 PM   #17
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oopps wrong one. ESP P101 High power version 1 of 2
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Old 17th February 2007, 10:40 PM   #18
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My next project....
http://sound.westhost.com/project68.htm
Subwoofer plate amp using this Heatsink that I cannabilized from a forklift battery charger.
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Old 17th February 2007, 11:24 PM   #19
GK is offline GK  Australia
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Default Re: Lineup most Advanced HiFi Headphone Amplifier

Quote:
Originally posted by lineup

The Radio Amateur will tell you:
AIR Insulated variable capacitor.
This is The only option for a high performance.

He will not tell you using some plastic insulation cap.

Actually, vacuum capacitors are the best.
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Old 21st February 2007, 06:09 AM   #20
Werner is offline Werner  Europe
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Quote:
Originally posted by Bonsai
front panel ... from a company in Germany that cuts and engraves this stuff.
Looks nice. Which company was that? Schaeffer?


W
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