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Old 26th December 2011, 11:20 AM   #101
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zdr is right. I modified the orientation of T2.
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Old 26th December 2011, 11:32 AM   #102
AndrewT is offline AndrewT  Scotland
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Took me a while to see that one pic is upside down relative to the other.
It also seems the red rectangle is irrelevant to the thermal coupling.

I can see two To92 directly coupled together.
I can also see two To92 sandwiching a rectangular LED as a thermally coupled triplet. These are above the red capacitor, which in the upside down pic look as though they are located below the red cap.
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Old 29th December 2011, 01:32 PM   #103
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Default My first Group Buy

Hello Rudi and Metal.

I have just added my name to the Group Buy spreadsheet in the hope that it is still open. This is my first involvement in a group buy and I'm not sure what happens next.
What I would like to know is have you worked out any final costs yet and what are the shipping costs likely to be to the UK?

Seasons greetings to all

Roy.
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Old 29th December 2011, 01:44 PM   #104
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Roy,

METAL and I are currently very busy reading through Dr. Self's "Amplifier Design Handbook, Chapter 18: Grounding, cooling and layout"
to offer you the best possible layout (in our humble opinions).

Once we both have settled about the final design and layout (only then will I know, how big the PCBs will be), we will give you the price of the PCBs
and I will tell you, what the "small kit", which I will be goiing to offer, will include besides of the PCBs.
For example: the FUTABA MPC74 Emitter Resistors, the NJL - output transistors, hard to get caps, ...

The price for shipping is 3.45 worldwide, as long as the parts fit into a coated letter and do not weigh more than 500 gramm.
The payment will be done via PAYPAL.

Best regards - Rudi_Ratlos
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Old 30th December 2011, 03:20 PM   #105
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Ok Rudi,

Thanks for your reply.

Kind regards
Roy.
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Old 30th December 2011, 05:13 PM   #106
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Please, Pooge: I kindly ask you to keep off this thread!

If you want to do a new design, to offer your own group-buy: go ahead and open a new thread, but please do not use my thread for your purposes!

METAL and I have been reading and investigating a lot about proper layout, grounding, ...
We read "Designing Audio Power Amplifiers" by Bob Cordell, Chapter 16: "Power Supplies and Grounding", "Audio Power Amplifier Design Handbook" by Douglas Self, Chapter 18: "grounding, Cooling and Layout", articles of Randall Aiken about Star Grounding, ...,
to offer a proven and respectable layout.

This took some time, as I wrote before.

METAL and I are nearly done, and we think that we will show to the ones, who are interested in this (!) group-buy, the final result either tomorrow or on Sunday.

I do not count you, Pooge, to the "interested party list", and I ask you very friendly to not post in this thread any more.

Best regards - Rudi_Ratlos

Last edited by Rudi_Ratlos; 30th December 2011 at 05:15 PM.
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Old 30th December 2011, 09:42 PM   #107
kevinkr is offline kevinkr  United States
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Posts by Pooge regarding his plans for a competing GB have been deleted by moderation.
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Old 31st December 2011, 10:15 AM   #108
zdr is offline zdr  Belgium
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Quote:
Originally Posted by metal View Post
zdr is right. I modified the orientation of T2.
I don't know how, but I think we have both mirrored J1/J2 (T1/T2 in Eagle) footprints. Look at this post which seems to show correct configuration:

RMI-FC100, a single stage audio power amplifier

It must be coming from some early brd file that was posted. Please doublecheck it with 2SK170 datasheet.
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Old 31st December 2011, 10:36 AM   #109
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I will, thanks zdr :- )
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Old 31st December 2011, 04:04 PM   #110
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Default Current progress

Here is a quick peek to how the AMP PCB WILL basically look like. I believe this will be the final version for this AMP PCB. I asked Rudi to take care of the 2SK170 while I am working on the PSU PCB, basically thanks to zdr who pointed out this 2SK170 issue!

I am still working on the SPU part, the attached snapshot should also give an idea of how the PSU PCB shall look like. Actually, aligning components correctly took longer than I expected for this PCB.

After reading thru Self's and Cordel's books, I believe this is the correct way of doing GND:

- Signal (Both books discussed it).
- Speaker/Zobel GND (described in Dr. Self, chapter 18).
- RG (described in Dr. Self, chapter 18) used to connect decoupling caps on AMP PCB to PSU, this GND connection should be in the RG area, rather than the Speaker/Zobel or signal GND.

If you examine both PCBs, you will notice this has been applied.

regards

metal
Attached Images
File Type: png AMP.png (188.5 KB, 557 views)
File Type: png PSU.png (121.7 KB, 510 views)
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