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Old 2nd May 2012, 09:18 AM   #411
koldby is offline koldby  Denmark
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evette,
LOL

Alu is one of the best conductors, but I would not use the heatsink as a substitute for a copper PCB connection in a High End Hi-Fi amplifier. No way!

Koldby
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Old 2nd May 2012, 09:36 AM   #412
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Koldby, I intented to connect the GND planes on top and on the bottom to the GND plane in the middle of the PCB by means
of the soldering pins of / and the heatsink.

Since I am no more convinced about the conductivity, I will advise the builders to solder a wire across the black lines.

Best regards - Rudi_Ratlos
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Old 2nd May 2012, 10:55 AM   #413
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Those heathsinks are anodized, so their surface is covered with oxide which is hard and non-conductive. The soldering pins are press-fitted into the holes of the extruded aluminium, so the oxide layer will be scratched but the resistance of this joint isn't stable.
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Old 2nd May 2012, 02:19 PM   #414
koldby is offline koldby  Denmark
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Quote:
Originally Posted by Rudi_Ratlos View Post

Since I am no more convinced about the conductivity, I will advise the builders to solder a wire across the black lines.

Best regards - Rudi_Ratlos
That is good advise in my book

Koldby
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Old 4th May 2012, 10:12 AM   #415
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Gentlemen, I love pictures!

Please do me the favour and post pictures of the current status of your FC-100 build in this thread.
Find enclosed a picture of my 1.st shunt PCB.

It works as designed and - yes: I have connected the heatsinks to the GND-plane in the middle of the PCB via a solid wire on its solder side.

I will start with the 1st AMP PCB today.

Best regards - Rudi_Ratlos
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File Type: jpg Shunt.jpg (308.1 KB, 772 views)

Last edited by Rudi_Ratlos; 4th May 2012 at 10:17 AM.
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Old 7th May 2012, 12:15 PM   #416
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This is my current progress.
But I ran out of base stopper resistors (2R2), will take my bike now, drive to Hamburg (25Km) and buy a couple of them.

Best regards - Rudi_Ratlos
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Old 7th May 2012, 11:44 PM   #417
mlloyd1 is offline mlloyd1  United States
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rudi:

boards and parts received and all in great shape.
thx!
mlloyd1
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Old 12th May 2012, 09:33 AM   #418
koldby is offline koldby  Denmark
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Default Re: FC-100

Here is my FC-100 build.
It is the original PCBs and in a chassis bought in Hong Kong, therefore the brand name on the faceplate and backplate.
This is actually for sale as I have to reduce the number of amps in my household!
Shoot me a PM if you would like to know more.
Best

Koldby
Attached Images
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Old 13th May 2012, 03:12 PM   #419
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Gentlemen,

my build of the FC-100 is "on hold":

Click the image to open in full size.

http://www.abload.de/img/fc-100oefds.jpg

since I am struck with a whole bunch (50 pcs.) of "fake 2SA1360" transistors right now:

Click the image to open in full size.

http://www.abload.de/img/2sa13608jczf.jpg

These are not genuine Toshiba transistors - I am absolutely sure about it, but Toshiba Germany has this to be confirmed by Toshiba Japan!
And this will take a long time.

Please be sure to buy your transistors from reliable distributors only!

In the meantime I will proceed with the heatsinks for the FC-100:

Click the image to open in full size.

http://www.abload.de/img/hs0010qfzb.jpg

Click the image to open in full size.

http://www.abload.de/img/front-20120507_1122100qdiu.jpg

Best regards - Rudi_Ratlos

Last edited by Rudi_Ratlos; 13th May 2012 at 03:21 PM.
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Old 13th May 2012, 05:19 PM   #420
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Default Nice Rudi....very nice

You are on the mood....i hope it sounds the way you like.... Roender is a great designer...for sure it will sound awesome.

Well... Roender is a real designer....has a degree of Physics i think and have studied deeply amplifiers.

I would like to see your pictures full size (and full resolution too) .... sadly i could read you prefer to do this way...it is all right this way too...i use to copy and expand here in my screen.

regards,

Carlos
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