Roender's FC-100 prototype and builder's thread - Page 50 - diyAudio
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Old 23rd August 2012, 12:41 PM   #491
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Andrew,

can you see these pictures now?

Best regards - Rudi
Attached Images
File Type: jpg FC-100.jpg (208.0 KB, 667 views)
File Type: jpg FC-101.jpg (423.4 KB, 628 views)

Last edited by Rudi_Ratlos; 23rd August 2012 at 12:47 PM.
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Old 23rd August 2012, 12:45 PM   #492
AndrewT is online now AndrewT  Scotland
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Yes, I can see those attachments. Nice detailed pics.
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regards Andrew T.
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Old 23rd August 2012, 12:57 PM   #493
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strange, I can see them. I am not registered at www.abload.de
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Old 24th August 2012, 01:32 PM   #494
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A good DIY-friend of mine, Klaus, who helped me a lot with the build of my ALU-case, sent me a picture of his FC-100 today.

During his build and quiescent current adjustment, he encountered no problems at all and is enjoying listening to the music.

The heatsink, as shown on the picture, is an intermediate solution.
Klaus will go and build two mono-blocks.

Best regards - Rudi_Ratlos
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File Type: jpg Klaus.jpg (343.2 KB, 585 views)
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Old 25th August 2012, 06:02 AM   #495
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I thought Roender said that his amp is 2W class A which means idle heat is less than 35W. Are such large heatsinks needed ?

Last edited by P. Lambda; 25th August 2012 at 06:15 AM.
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Old 25th August 2012, 06:59 AM   #496
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John,

I had my heatsinks at hand, when I started the project.
The heatsinks of Klaus are an intermediate solution.

Please keep in mind that the PCBs are about 250mm long.
A "ready-to-go" case, the one that ZDR used for example (see attached image), will do it.

Best regards - Rudi_Ratlos
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File Type: jpg amp.jpg (416.2 KB, 514 views)
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Old 25th August 2012, 09:59 AM   #497
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I have not yet seen any FC-100 build applying a PI / EMV - filter (10 Ohm / 1µH) to the speaker's output.

Why is this so?

Best regards - Rudi
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Old 25th August 2012, 11:45 AM   #498
zsaudio is offline zsaudio  Europe
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Quote:
I have not yet seen any FC-100 build applying a PI / EMV - filter (10 Ohm / 1µH) to the speaker's output.
Mihai said that the amp is stable without it, i second that but i'm gonna use it in my final amp.

What about Thiel like this in post #10?

When an output inductor is needed???

zsaudio
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Old 25th August 2012, 11:53 AM   #499
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Zsolt, I will rely on your findings .

Best regards - Rudi
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Old 30th August 2012, 03:50 PM   #500
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I am currently going on and integrate a source selection / volume attenuation into my FC-100 case.

The selector/attenuator is based on BurrBrowns (TI) PGA2311 - chip, which is controlled by a PIC 16F4550 µProcessor.
I prefer this solution to an ALPS-DualPotentiometer, to the Lightspeed-Attenuator, ..., and:
everything is controlled remotely by means of Infrared.

The digital PCBs will be placed on an ALU - U-bracket, which I will mount on the 3 tranformers - building "the second floor".

But this all takes a lot of time ...

Best regards - Rudi_Ratlos

P.S. The source selector / attenuator is DIYed - of course!
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File Type: jpg VV 003.jpg (659.9 KB, 402 views)

Last edited by Rudi_Ratlos; 30th August 2012 at 04:02 PM.
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