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Old 11th January 2015, 07:05 PM   #1
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Default REVISION OF Very Best Amplifier ... 2015

Dear friends:

Here is a new thread.

Purpose: revision of the existing thread
The Very Best Amplifier I Have Ever Heard!!!!

I will ask this with total kindness:

The mentioned thread was very confusing for many members like me. Of course it is full of good knowledge and wise people. But many members are fond of selfishness and some others have been mocking arround.

Please be so kind to contribute with an open mind, avoiding mysteries and sharing knowledge, with a real hobbyst point of view. That's is what a forum stands for: help each other and share good information.

Lastly, please upload schematic diagrams and try to clearly explain what you think and/or suggest.

I bought 2 original boards that work with just 4 MOSFET transistors as power output (not 3). I suggest to start with this first schematic and try to stick to this.

I suggest to order this first part and then we could jump to many other ideas and circuit revisions. But I kindly ask not to fall in the other's forum disorder .

I am uploading the original schematics and board drawings as NagysAudio provided.

Any suggestion is very welcome
Roberto
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Old 11th January 2015, 08:28 PM   #2
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Some useful information (kindly sent to me by NagysAudio by email):

Here's a complete list of all the MOSFETS and equivalents that can work in this amplifier:

Plastic Case:

Hitachi 2SK1058/2SJ162 (Obsolete)
Renesas 2SK1058/2SJ162
Hitachi 2SK1057/2SJ161 (Obsolete)
Renesas 2SK1057/2SJ161
Hitachi 2SK1056/2SJ160 (Obsolete)
Renesas 2SK1056/2SJ162
Exicon ECX10N16/ECX10P16
Exicon ECX10N20/ECX10P20
Magnatec BUZ900P/BUZ905P
Magnatec BUZ901P/BUZ906P
Magnatec BUZ902P/BUZ907P
Magnatec BUZ903P/BUZ908P

Metal Case:

Hitachi 2SK135/2SJ48 (Obsolete)
Hitachi 2SK134/2SJ49 (Obsolete)
Hitachi 2SK133/2SJ50 (Obsolete)
Hitachi 2SK176/2SJ56 (Obsolete)
Hitachi 2SK175/2SJ55 (Obsolete)
Exicon ECF10N16/ECF10P16
Exicon ECF10N20/ECF10P20
Magnatec BUZ900/BUZ905
Magnatec BUZ901/BUZ906
Magnatec BUZ902/BUZ907
Magnatec BUZ903/BUZ908

As you can see, there are MANY choices out there. All are fantastic MOSFETS and will work 100% in the Goldmund schematic.

NOTE: THE IRF HEXFETS WILL NOT WORK IN ANY GOLDMUND SCHEMATIC. PLEASE BE CAREFUL!

Attached is a copy of the schematic I made trying to put the circuit all together. Needs revision and I hope that somebody could help and tell if the protection circuit is correctly drawn.

Also some links to required parts and its vendors.

Mr. Steve LaGaisse from RFparts provided the 2N5566 JFET's
email: Steve <Steve@rfparts.com>
I am reproducing his quote here:

Quote:
We can only offer the 2N5566 from our stock. Price is $7.95 each for 50 pieces.

Thank you,
Steve LaGaisse
Steve LaGaisse
RF Parts Co
ph 760-744-0700 ext.316
fax 760-744-6030
Home page


SEMELAB BUZ900 N CHANNEL MOSFET, 160V, 8A, TO-3
BUZ900 - SEMELAB - N CHANNEL MOSFET, 160V, 8A, TO-3 | Newark element14 US

SEMELAB BUZ905 P CHANNEL MOSFET, -160V, 8A, TO-3
BUZ905 - SEMELAB - P CHANNEL MOSFET, -160V, 8A, TO-3 | Newark element14 US

BD249
Search Results | Newark element14 US

MULTICOMP BD250C BIPOLAR TRANSISTOR, PNP, -100V, TO-247
BD250C - MULTICOMP - BIPOLAR TRANSISTOR, PNP, -100V, TO-247 | Newark element14 US

Bc182
Transistors - Bipolar (BJT) Single Product List | Semiconductors - Discretes | Newark element14 US

JTN1AS-PA-F-DC24V - RELAY:
JTN1AS-PA-F-DC24V Panasonic Electric Works | 255-1720-ND | DigiKey

CAP ALUM 10000UF 63V 20% SNAP:
ECO-S1JA103EA Panasonic Electronic Components | P7492-ND | DigiKey

CAP ALUM 220UF 160V 20% RADIAL:
EEU-EE2C221S Panasonic Electronic Components | P13627-ND | DigiKey

CAP ALUM 150UF 63V 20% RADIAL
EEU-FC1J151 Panasonic Electronic Components | P10344-ND | DigiKey

FUSE GLASS 6.3A 125VAC 5X20MM
023306.3MXP Littelfuse Inc | F3634-ND | DigiKey




Also Norbert (NagysAudio) sent this to me:

Quote:
Hi Roberto,

- Toshiba 2SK134/2SJ49 = Magnatec BUZ900/BUZ905, or BUZ901/BUZ906 (available at Newark, Farnell, eBay, etc.)
- MPSA93/MPSA43 = MPSA92/MPSA42 (available at Newark, Mouser, Farnell, DigiKey, eBay, etc.)
- BD250C/BD249C (available at Newark, Farnell, eBay, etc.)
- BC546B (available at Newark, Mouser, DigiKey,eBay, etc.)
- BC182B (available at Mouser, eBay, etc.)
-2N5565 = 2N5564/2N5566 (available at eBay and a bunch of other places from China online) also, the 2N5566, last I've checked, is available at Home page, you can contact Steve Lagaisse at 760-744-0700 ext. 316 to order them.
- BC556B = (available at Newark, Mouser, DigiKey, eBay, etc.)
- BC449 = MPSA06/BC546B (available at newark, Mouser, DigiKey, eBay, etc.)

This is the complete transistor reference list for the Goldmund Mimesis 3 amplifier. I won't include another one, so please print this one out. The hardest part to find is the 2N5564/2N5565/2N5566 dual j-fet, as they have no equivalents. But if you do some searching online, you should be able to come up with a few more sources than the ones I've listed above.

The MOSFETS you'll have to match. I cannot help you there as I do not sell any parts, nor have any of these MOSFETS in stock myself. You might have to order a few extra ones in case they don't match up too well. If you need the correct procedure on matching MOSFETS, please do a search online, there are hundreds of references.

Everything else you should be able to easily find on Newark, Mouser, DigiKey, Farnell, eBay, etc.

For heatsinks, my favorite place to purchase from is Extruded Aluminum Heatsinks from HeatSinkUSA

My favorite toroidal transformers are the Avel Lindberg. You can talk to Melanie Roman there, she's a very pleasant person to deal with.

Please understand, this is a solid state amplifier and unlike a tube amplifier, it requires a good understanding of electronics in order to build it. After you've finished it, the amplifier should be tested for oscillations. Depending on your grounding scheme, the length of input/output wires, chassis, board orientation, etc. you might have to play with the small capacitor values (4.7pF, 8.2pF, 10pF, 47pF, etc.), or even strategically add new ones.

I will supply you the complete original schematic for the Goldmund Mimesis 3 amplifier and the parts layout for the PCB boards. Unfortunately, everything else will be up to you to figure out and my help will be very limited. If this is acceptable to you, I'll get the boards out to you tomorrow morning. If not, I can send you a refund. There are no returns/refunds once the boards have shipped.

Regards,
Norbert
I will write a resume of some usual questions about this project in my next post.

Cheers
Roberto
Attached Files
File Type: pdf GOLDMUND_MIMESIS_3_CLONE_DRAFT_WITH_PROTECTION.pdf (47.2 KB, 270 views)
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Old 12th January 2015, 08:56 AM   #3
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Quote:
Originally Posted by obiwankenobi View Post
Dear friends:

(...)

Please be so kind to contribute with an open mind, avoiding mysteries and sharing knowledge, with a real hobbyst point of view. That's is what a forum stands for: help each other and share good information.

Any suggestion is very welcome
Roberto
It's good. Like it.

Subscribed!
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Old 12th January 2015, 10:48 AM   #4
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Thank you Karl vd Berg, you are very welcome ! BTW my eldest son is now living in Amsterdam since a couple of weeks, he was hired there by a big company. Such a beautiful country.

Last edited by obiwankenobi; 12th January 2015 at 11:05 AM.
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Old 12th January 2015, 12:00 PM   #5
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There are some errors or omissions on the PCB tracks, for example, only one side of the relay coil is connected.
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Old 12th January 2015, 01:43 PM   #6
alex mm is offline alex mm  Romania
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Quote:
Originally Posted by KatieandDad View Post
There are some errors or omissions on the PCB tracks, for example, only one side of the relay coil is connected.
I don't think so...... I'm the PCB designer and layout it's OK , it's working as it is .......

Last edited by alex mm; 12th January 2015 at 01:45 PM.
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Old 12th January 2015, 03:14 PM   #7
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The board of Mimesis clone 3 and 9.2 working very good 110%.
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Titan 2000 ,Cressendo Millenium 2000, P3A ,VSSA ΤΟ3 ,B1 Buffer ,Golmund Mimesis 9.2 Clone ,Preamplifier Dispre 2 - JFET, DCB1 SALAS, D-Reflector, BibFet, ES9018K2M
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Old 12th January 2015, 03:35 PM   #8
smatteo is offline smatteo  Italy
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Hello

I want to build and amplifier of this project having some paired 2SK1058+2SJ162.
I would like to buy the pcb release for 2 or 3 pairs of final mosfet, who may help me?
thanks in advance

matteos
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Old 12th January 2015, 04:25 PM   #9
alex mm is offline alex mm  Romania
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Sorry but your schematic not so good ...... some errors, need to be corrected .
Why you don't use original schematic?Click the image to open in full size.
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Old 12th January 2015, 05:45 PM   #10
matt09 is offline matt09  United Kingdom
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Alex, I assume you must have a set of different PCB designs dating right back to 2010 to the latest one you posted on 2nd December? It would be extremely useful if you could post each design in turn with accompanying schematic and brief change log of what has been altered and why (and if it's tested and working). If you cannot remember why all changes were made it would still be valuable to have the change list with accompanying schematic.

Once we have identified all the changes we can verify these are correct through to your most recent design. You could maybe make seperate posts for each revision and edit and add accordingly as we work through the changes. This would give some structure to the project and everyone can refer to this as a base reference for each version they have.

Nikosokey
, it would be very helpful for all of us if you would do a brief write up with your schematic attached (so we can reference this to one of Alex's uploads). If you could explain any changes or problems you faced and how you solved these (briefly) this would be an excellent resource.

Likewise if would be useful if anyone who has built a working revision could do the same and we'll start to have a working structure for all persons

Last edited by matt09; 12th January 2015 at 05:50 PM.
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