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  #16  
Old 17-06-12, 12:03 PM
NRWler04 NRWler04 is offline
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Quote:
Originally Posted by mudlark View Post
why radial caps for the output caps? Can't you use axial with leads? No doubt space is at a premium. The 303 design has off board caps and output transistors and I have never seen any complaints about that topology.
That's just an idea. If I use new PCB's I'll want to bring it to a level of components, which we would use today ...

See the WIMA Caps .....

But it's difficult to find 4700uF 63V radial caps ....
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  #17  
Old 17-06-12, 12:09 PM
mudlark mudlark is offline
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Sorry, I meant "why use axial caps" Radial are the way to go because of availability

http://cpc.farnell.com/panasonic/eco...63v/dp/CA06151


..http://www.maplin.co.uk/high-grade-a...t=Electrolytic

Last edited by mudlark; 17-06-12 at 12:36 PM.
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  #18  
Old 17-06-12, 01:07 PM
NRWler04 NRWler04 is offline
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Quote:
Originally Posted by mudlark View Post
Sorry, I meant "why use axial caps" Radial are the way to go because of availability

http://cpc.farnell.com/panasonic/eco...63v/dp/CA06151


..http://www.maplin.co.uk/high-grade-a...t=Electrolytic
Yes, but difficult to get some from Elna or Nichicon ...

Or Rubycon ?

I don't know which I can use ....
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  #19  
Old 17-06-12, 01:10 PM
mudlark mudlark is offline
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I suggested the panasonics because Netaudio use them. I've done some searching on the net for information about good capacitors to use or the correct measurements but not succeeded so far.

Perhaps try to ask someone with a heed audio amp to open it up and see what's going on.
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  #20  
Old 17-06-12, 02:04 PM
NRWler04 NRWler04 is offline
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Quote:
Originally Posted by mudlark View Post
I suggested the panasonics because Netaudio use them. I've done some searching on the net for information about good capacitors to use or the correct measurements but not succeeded so far.

Perhaps try to ask someone with a heed audio amp to open it up and see what's going on.
From what I saw in the www, Mundorf and BC are in .....

I asked in several forums for Heed pictures ....

So far, no feedback ....
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  #21  
Old 17-06-12, 02:06 PM
NRWler04 NRWler04 is offline
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Next step will be new mono-amps based on Nytech Ideas ...

Also new housings are actually in the design phase .....

I'll post drawings if somebody is interested ....
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  #22  
Old 17-06-12, 02:59 PM
mudlark mudlark is offline
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http://www.heedaudio.hu/en/products/...ine/pm/gallery

It has already been done.
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  #23  
Old 17-06-12, 10:50 PM
NRWler04 NRWler04 is offline
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Quote:
Originally Posted by mudlark View Post
I know

Too expensive .....

I need four mono blocks ...
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  #24  
Old 18-06-12, 12:26 AM
mudlark mudlark is offline
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I was looking at the layout. Power supply at the front away from incoming signal, heatsink in the middle acting as a shield, heat sink sits above and below holes for good heat dispersal.

i know how you feel about the cost. I need four power amplifier channels too!
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  #25  
Old 18-06-12, 10:55 AM
NRWler04 NRWler04 is offline
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If we can improve the principle of the 602's, transfer it to Mono-Amps it would be good ...

The ideas are:
- Improve the Power Supply with a lot capacity, at least 18.000F with Nichicon KG's 4700F 100V
- Use a BurrBrown OP for the first circuit in the amplifier ....
- Stabilze the Powersupply on the amp circuit with Zener-Diodes ....
- Implement a big Cap at the end .... maybe 10.000F

Further suggestions are warmly welcome ...

Or setup a MosFet Mono-Block, as we think the Heed-PM's are ... We found some very interesting circuits.

I designed a black housing based on aluminium standard profiles and some special made parts with a black Plexiglas Front with a green LED ... Dimension will be 220 mm wide, 75mm high and 360 mm depth .... I will post the front view ....




Total material cost including electronic parts, maybe ~350 - 400 € per block. That's a rough estimation ....
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Last edited by NRWler04; 18-06-12 at 12:23 PM.
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  #26  
Old 30-06-12, 03:48 PM
NRWler04 NRWler04 is offline
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Update .....
- Schematics for the dual rail PSU is ready ....
Components:
* Nichicon KG 4700uF 100V
* Wima 0.01 uF 100v 1%
* good old 1N4501 or 1N4504
Schematics and board are prepared for a trafo with two 58V windings ....
- Parts for prototype housings are ordered ....

I'll keep you updated....

One interesting thing is also to setup a new electronic XO based on Linkwytz Riley .....found some interesting schematics.

Regards from Germany
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  #27  
Old 14-07-12, 12:32 PM
NRWler04 NRWler04 is offline
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New housings for CPA602 are ready ..... at least the prototype







Of course, housing will be painted black later ......
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Last edited by NRWler04; 14-07-12 at 02:56 PM.
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  #28  
Old 14-07-12, 12:51 PM
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And here is the 2012 block Layout for the new 602's ......

Completely designed in Mono-Design .....



Next step is to prepare new PCB's for the Amps ..... Only finest components will be used .....

Nex step of Nerovolution will be to design the Mono-Blocks based on Mr. Hay's ideas .......

New PSU Board will also fit in original CPA 602's. The new 120 VA Toroids will also fit into the original housing....
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Last edited by NRWler04; 14-07-12 at 01:02 PM.
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  #29  
Old 14-07-12, 02:30 PM
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Here is the PSU-PCB .....

Any tips are warmly welcome .....

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  #30  
Old 15-07-12, 12:08 PM
NRWler04 NRWler04 is offline
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CPA 602 Schematics ....

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
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