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Old 24th May 2013, 10:53 AM   #481
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Join Date: Jul 2010
Location: Cacak
Default Cheap chassis for VSSA PeeCeeBee project

The cheapest option for diy-er is to go to the nearest metalworks company willing to serve individual buyers. One such company is located at 30 minutes walking distance from my home.

Box consist of three pieces:

  • Chassis 3mm aluminium (very stable!)
  • Cover 2mm aluminium
  • Front plate 5mm aluminium

All pieces are cut by guillotine method and bent at hydraulic press. Company in my home town has waterjet and laser CNC machines but it is too expensive for me to use it for cutting holes. Also, they usually ask for AutoCAD drawings and I do not have AutoCAD on my PC. Therefore all holes are made using drill, files and sandpaper. I use three box sizes: S(mall), M(edium) and L(arge). The box shown is M, roomy enough for preamps and small chip amp based power amps with toroidal transformers up to 200VA. M and L box are in standard 430mm width, and S is half of it.

S box cost me around USD15.- L box is around USD25.-
Attached Images
File Type: jpg Chassis1.JPG (110.7 KB, 555 views)
File Type: jpg Chassis2.JPG (115.7 KB, 545 views)
File Type: jpg Chassis3.JPG (111.5 KB, 526 views)
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Old 24th May 2013, 11:33 AM   #482
Tyimo is offline Tyimo  Hungary
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Hi Ivanlukic!
Very nice box!
I sent a PM to you!
Greets:
Tyimo
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Old 25th May 2013, 10:53 PM   #483
PauloPT is offline PauloPT  Portugal
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Default Bypass capacitors

I need help choosing the 1uF bypass capacitors. Wich of these are better or sound better:

MKT Arcotronics R82

Vishay Roederstein MKT1826

Evox RIFA MMK

Thank you
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Old 26th May 2013, 04:54 AM   #484
PMI is offline PMI  United States
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Quote:
Originally Posted by PauloPT View Post
I need help choosing the 1uF bypass capacitors...
I don't think these will make a big difference in the sound. Not as much as the main filter caps, and not nearly as much as the input series capacitor.
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Old 26th May 2013, 11:43 AM   #485
PauloPT is offline PauloPT  Portugal
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Thanks for answering, PMI!

Now for the electros: between Nichicon KA and Panasonic FC/FM wich ones should I use?

Thanks.
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Old 26th May 2013, 12:59 PM   #486
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Hi Paulo,
I have used a 1F capacitor made by NSF, as it isn't very important, and Panasonic FM's for input and output sections, and FC for the larger Vas stage requirement. The ones on the output stage are 2 x 680F per rail, because that is what I could find for the money. But where it is (in the circuit and on the board) is as important as the quality, IMHO.

I also use Nichicon caps for the output and Vas power supplies (8,800 F per rail), as I have three different power supplies per board, 12v for input, 42v for Vas and 35 v for output section, and I am making 4 amplifiers.

Last edited by cats squirrel; 26th May 2013 at 01:04 PM.
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Old 26th May 2013, 06:35 PM   #487
PMI is offline PMI  United States
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Quote:
Originally Posted by PauloPT View Post
Now for the electros: between Nichicon KA and Panasonic FC/FM wich ones should I use?
Unfortunately, there is no single best choice.
Your personal preference will be more important than any advice you get.

There will not be one SINGLE type of capacitor that will be best in all places in the circuit, or one type that will satisfy all people building the same circuit. Even today, no single device will have ALL the best possible characteristics.

Since I know you have a pair of my boards, I would say this:

In general (if you are building the board with 6 caps), select low ESR high ripple types for the capacitor closest to the output (power) transistors. Select audio grade caps closest to the input and VAS stages (low ESR or low impedance will also work here, obviously). See pic below.

If you are building the version exactly according to Shaan's circuit (with 4 caps), then you have to rely on the specs of the power supply "reservoir" caps for the power stage, and select the other 4 caps according to whatever is important to you.

Here is a link to a simple article about low ESR and low impedance (low Z), with no audiophool jargon:

http://www.illinoiscapacitor.com/pdf...or_fiction.pdf
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Old 26th May 2013, 06:38 PM   #488
PMI is offline PMI  United States
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@Cats Squirrel: Sounds interesting... any pics yet?
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Old 26th May 2013, 07:35 PM   #489
PauloPT is offline PauloPT  Portugal
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Quote:
Originally Posted by PMI View Post
Unfortunately, there is no single best choice.
Your personal preference will be more important than any advice you get.

There will not be one SINGLE type of capacitor that will be best in all places in the circuit, or one type that will satisfy all people building the same circuit. Even today, no single device will have ALL the best possible characteristics.

Since I know you have a pair of my boards, I would say this:

In general (if you are building the board with 6 caps), select low ESR high ripple types for the capacitor closest to the output (power) transistors. Select audio grade caps closest to the input and VAS stages (low ESR or low impedance will also work here, obviously). See pic below.

If you are building the version exactly according to Shaan's circuit (with 4 caps), then you have to rely on the specs of the power supply "reservoir" caps for the power stage, and select the other 4 caps according to whatever is important to you.

Here is a link to a simple article about low ESR and low impedance (low Z), with no audiophool jargon:

http://www.illinoiscapacitor.com/pdf...or_fiction.pdf
Good advice, PMI, thank you! And thank you for the link to the article also.
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Paulo.
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Old 26th May 2013, 08:29 PM   #490
PauloPT is offline PauloPT  Portugal
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Anyway, I've never listened to a KA before, only Fine Gold, KZ and FW. Does anyone know how they are soundwise compared with lets say FG?
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