one more tweak...
Given you guys seems to be open to experiments, why not try this one?
Use a (possibly much) smaller value for R39,R40. I would try 220K, 100K, 47K and... "nothing", that is just short-circuit C34 & C35 so that you'll have about 22K (R43,R44) there.
(I would try the last option first. Not only it's the simplest & quickest hack to implement, but the most "extreme" setting too...).
Basically this mod. will reduce the gain of the 318 by applying more local NFB around its output stage (sort of). Its output impedance should be reduced accordingly, which should give more balance to the HCP "bridge" (good).
In turn this will increase the open loop output impedance of the HCP "bridge" (good) and reduce the amplifier overall loop gain (as a side stability should improve), deeply altering all the characteristics of the amplifier.
I would expect some rather evident sonic changes... perhaps in the right direction (but maybe not). Let' try it and let us know about the results...
Given you guys seems to be open to experiments, why not try this one?
Use a (possibly much) smaller value for R39,R40. I would try 220K, 100K, 47K and... "nothing", that is just short-circuit C34 & C35 so that you'll have about 22K (R43,R44) there.
(I would try the last option first. Not only it's the simplest & quickest hack to implement, but the most "extreme" setting too...).
Basically this mod. will reduce the gain of the 318 by applying more local NFB around its output stage (sort of). Its output impedance should be reduced accordingly, which should give more balance to the HCP "bridge" (good).
In turn this will increase the open loop output impedance of the HCP "bridge" (good) and reduce the amplifier overall loop gain (as a side stability should improve), deeply altering all the characteristics of the amplifier.
I would expect some rather evident sonic changes... perhaps in the right direction (but maybe not). Let' try it and let us know about the results...
My interpretation of the X-Calibre:
This has been optimized to be manufactured by Olimex. It is set up to use only their standard drill sizes and their SSS Proto Panel (160mm x 100mm).
All silkscreen lines have been increased in size to meet Olimex's minimum specs. A few components have been moved as allowed by the component package size, to match the parts called for in the attached BOM. A few stray traces have been removed as well.
I have NOT produced this board yet, though I plan too. Use the files at your own risk, but hopefully it will help someone reach the goal of building this amp.
Included are the BOM, and a single and dual layer version of the PCB. The PCB files include the Excellon drill files, and the Gerber files for the copper, silkscreen, soldermask for both sides of the board. Also included are the Sprint .LAY files for anyone who wants to change things around.
Please feel free to make any comments. Hope it helps!
This has been optimized to be manufactured by Olimex. It is set up to use only their standard drill sizes and their SSS Proto Panel (160mm x 100mm).
All silkscreen lines have been increased in size to meet Olimex's minimum specs. A few components have been moved as allowed by the component package size, to match the parts called for in the attached BOM. A few stray traces have been removed as well.
I have NOT produced this board yet, though I plan too. Use the files at your own risk, but hopefully it will help someone reach the goal of building this amp.
Included are the BOM, and a single and dual layer version of the PCB. The PCB files include the Excellon drill files, and the Gerber files for the copper, silkscreen, soldermask for both sides of the board. Also included are the Sprint .LAY files for anyone who wants to change things around.
Please feel free to make any comments. Hope it helps!
Not to jump in on top of Salesmonster but ...
Those files with the '.GBR' extension are Gerber files as required by PC board houses for production.
The '.LAY' file is the project file as created by the 'Sprint-Layout' PCB editor. It happens to be my board editor of choice!
http://www.abacom-online.de/uk/html/sprint-layout.html
Carl
Those files with the '.GBR' extension are Gerber files as required by PC board houses for production.
The '.LAY' file is the project file as created by the 'Sprint-Layout' PCB editor. It happens to be my board editor of choice!
http://www.abacom-online.de/uk/html/sprint-layout.html
Carl
The .lay files are Sprint files. You can find a viewer here: http://abacom-online.de/uk/html/dateien/demos/viewlayout50.exe
The .gbr files are Gerber files that are used by a lot of PC Board manufacturers to do the copper and silkscreen layers on a board.
The .drl file works with the Gerber file. It is a drill hole file. It indicates the size and location of each hole.
If there is any interest, I have tweeked the 1 Layer and 2 Layer boards to make for easier manufacturing. I used the DRM checker @ batchpcb.com to verify manufacturability (The one at 4pcb.com was driving me NUTS).
The size (100mm x 160mm) was chosen because it is a standard panel size at olimex.com. It looks like they can build the 1 Layer version for $26 and the 2 Layer version for $33. The only functional difference between the 2 versions is the use of wire links and zero ohm resistors.
With Olimex it looks like shipping to the US would be $9 for slow boat shipping.
BatchPCB.com looks like they may actually be a better choice if you are looking for a contact based in the US. They contract out to Asia for the manufacturing, while they are the re-seller.
Has anyone used either of these 2 companies?
The .gbr files are Gerber files that are used by a lot of PC Board manufacturers to do the copper and silkscreen layers on a board.
The .drl file works with the Gerber file. It is a drill hole file. It indicates the size and location of each hole.
If there is any interest, I have tweeked the 1 Layer and 2 Layer boards to make for easier manufacturing. I used the DRM checker @ batchpcb.com to verify manufacturability (The one at 4pcb.com was driving me NUTS).
The size (100mm x 160mm) was chosen because it is a standard panel size at olimex.com. It looks like they can build the 1 Layer version for $26 and the 2 Layer version for $33. The only functional difference between the 2 versions is the use of wire links and zero ohm resistors.
With Olimex it looks like shipping to the US would be $9 for slow boat shipping.
BatchPCB.com looks like they may actually be a better choice if you are looking for a contact based in the US. They contract out to Asia for the manufacturing, while they are the re-seller.
Has anyone used either of these 2 companies?
you can have a much better deal with www.pcbcart.com
can you send me your file please. will like to see it.
I have since stopped listening to this amp but i must admit it is still a very good amp
can you send me your file please. will like to see it.
I have since stopped listening to this amp but i must admit it is still a very good amp
The only valid extension for upload are: gif jpg png txt zip jpeg pdf.
I've noticed with some files here at diyaudio.com, sometimes the extension is stripped away when you download them. Remane th file and add the .zip extension. Then you should be able to open it.
Does anyone know why the site does that, and how to fix it?
Dave
I've noticed with some files here at diyaudio.com, sometimes the extension is stripped away when you download them. Remane th file and add the .zip extension. Then you should be able to open it.
Does anyone know why the site does that, and how to fix it?
Dave
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