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  #31  
Old 17-07-12, 03:14 PM
NRWler04 NRWler04 is offline
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Grmpf .....

Where are the Gurus .....

No Tips?
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  #32  
Old 19-07-12, 02:19 PM
NRWler04 NRWler04 is offline
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I prepared an updated PSU for the 602 with an unregulated and regulated +80V Supply as it is needed for the CPA602s .....



Can somebody give me a tip how the Toroid looked like in the 602's? The queston is, how we garantee a stable regulated +81V Supply ....
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  #33  
Old 19-07-12, 02:22 PM
NRWler04 NRWler04 is offline
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Quote:
Originally Posted by NRWler04 View Post
Gentlemen,

here are the schematics for the CPA 602:



As I want make new PCB's I want to optimize the circuit ...

Please give me your ideas to discuss how we can optimize it.

One thing I already changed are the cap's at the end. There is the option to use one Axial-Cap or 5 Radial Caps. This I did, because I have a new housing where I can implement higher Caps. The idea is to use 5 Nichicon FW 2200F 63V in parallel.

Here is a overview about the caps I want to use:

Part Original Value Value Brand Value Notice
C1 0,001 F 0.001 WIMA FKP2 1% 1000 pf 63V
C2 22 F 50V 22F 50V PANASONIC FC 22 F 50V
C3 10 F 50V 10F 50V ELNA Simlmic II 10 F 50V
C4 10 F 50V 10F 50V ELNA Simlmic II 10 F 50V
C5 100 F 35V 470F 50V ELNA Simlmic II 470 F 50V
C6 100 F 10 V 100F 10V PANASONIC FC 100 F 10V
C7 0,01 F 0,01 F 63V WIMA FKP2 1% 0,01F 63V
C8 100p 68p Styroflex 68p
C9 68p 68p Styroflex 68p
C10 0,1 F 0.1 Vishay Roederstein MKP 0,1 F 100V - 1%
C11 0,1 F 0.1 Vishay Roederstein MKP 0,1 F 100V - 1%
C12 2200 F 63V 4700F 63V Roederstein Audio Gold 4700 F 63V Or C14 - C18
C13 22 F 100 V 22F 100V PANASONIC FC 22 fF 100V
C14 2200F 63V NICHICON FW 2200 F 63V Alternativ to C12
C15 2200F 63V NICHICON FW 2200 F 63V Alternativ to C12
C16 2200F 63V NICHICON FW 2200 F 63V Alternativ to C12
C17 2200F 63V NICHICON FW 2200 F 63V Alternativ to C12
C18 2200F 63V NICHICON FW 2200 F 63V Alternativ to C12

All resistors will be Vishay Dale Metal Film 0,25W.

What are your thoughts ....

All tips are warmly welcome ....

Regards from Germany
The above schematics are wrong ....

I made the mistake to interprate the unregulated 80V as 0V. The schematics are for the CPA602's.

Please see the updated one ....



The above PSU schematics are according to the +80V regulated and unregulated requirements.
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  #34  
Old 22-07-12, 05:40 AM
mudlark mudlark is offline
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I am rather disappointed that you haven't got more interest in your thoughts. As far as I am concerned, my interest remains.
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  #35  
Old 22-07-12, 09:56 AM
NRWler04 NRWler04 is offline
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Yes, I expected more interest and thought there are a lot opportunities to improve the amps ...

Nytecholdie made a proposal for Piggyback-Trafos for the regulated 81V supply .... This I will follow for the new designed amps.
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  #36  
Old 22-07-12, 10:20 AM
NRWler04 NRWler04 is offline
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Update ....

Here's the Layout for the PSU-PCB



PCB fits also into existing housing. Fixtures have to be replaced .....

and one PA-PCB ....... first try



Left half looks really structured and sorted, right half has still room for improvement.

PCB already contains the regulated 81V rail (Right Bottom Corner). And there is the option to use five radial caps instead of one axial cap. In my new housing I will use 5 220063F's.
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  #37  
Old 22-07-12, 10:46 AM
NRWler04 NRWler04 is offline
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Update for the Box:

To get an idea how it looks like with the black aluminium heatsink profiles outside ....





Sorry for the poor quality... I'll post better ones .....
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  #38  
Old 22-07-12, 10:54 AM
mudlark mudlark is offline
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Are the top and bottom fixed to the heat sink sides. I like the simple few parts idea. The original looks Ok (202), but the construction of the whole is weak.

Fasteners, matt black countersunk stainless. No one knows the fasteners are top quality, but owners will.

Are you using two different boards for the poweramps?
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  #39  
Old 22-07-12, 11:00 AM
NRWler04 NRWler04 is offline
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The Body of the box is a U out of 2mm Aluminium sheet. The top, the front and also the back as the heatsinks on both sides are connected with screws ....

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  #40  
Old 22-07-12, 11:07 AM
NRWler04 NRWler04 is offline
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Quote:
Originally Posted by mudlark View Post
Are the top and bottom fixed to the heat sink sides. I like the simple few parts idea. The original looks Ok (202), but the construction of the whole is weak.

Fasteners, matt black countersunk stainless. No one knows the fasteners are top quality, but owners will.

Are you using two different boards for the poweramps?
This are only the prototypes. The final release will be black - NERO Black. Just looking where I can anodise the top sheet in black matt finish.
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  #41  
Old 22-07-12, 11:11 AM
NRWler04 NRWler04 is offline
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Quote:
Originally Posted by mudlark View Post
Are you using two different boards for the poweramps?
Yes, in the NERO SA-1 there will be

- Two Toroids with 120VA
- Two "PiggyBack" Trafos for 81V VAS Supply
- A Dual Channel PSU
- Two PA Boards ...

Will be a complete mono designed Stereo Amplifier based on Mr. Hay's ideas ...

Hopefully he won't kill me
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  #42  
Old 22-07-12, 11:16 AM
NRWler04 NRWler04 is offline
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What I forgot: All PCB's will be in NERO BLACK with white letters .
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  #43  
Old 22-07-12, 11:46 AM
mudlark mudlark is offline
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How about a copper bottom...
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  #44  
Old 22-07-12, 12:06 PM
NRWler04 NRWler04 is offline
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Copper will be 105um, chemical aurum surface ....
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  #45  
Old 23-07-12, 03:28 PM
NRWler04 NRWler04 is offline
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No further tips to improve the PSU? No ideas how to improve the PSU for the CPA602('s) ?????

PSU PCB will go into Production on Wednesday ....

Very dissapointing Feedback .....
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