Roender's FC-100 prototype and builder's thread - Page 61 - diyAudio
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Old 21st December 2012, 08:09 AM   #601
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Gentlemen, if you are still wondering, how to build your FC-100 case, I want to give you an inspiration - see attached images.
This is how one of the German DIYers did it.

Start with an ALU - bottom plate (300 x 380mm, 4mm thick) and 2 ALU - side plates (150 x 380mm, 6mm thick) and buy 8 ALU brackets.
Leave a 10 mm gap between the bottom and side plates for good air ventilation.

Connect the heatsinks of your choice on the outer side of the ALU side panels.

Best regards - Rudi_Ratlos
Attached Images
File Type: jpg FC-100 Gehäuse 02.jpg (398.2 KB, 538 views)
File Type: jpg FC-100 Gehäuse 03.jpg (352.9 KB, 514 views)
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Old 21st December 2012, 08:34 AM   #602
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Rudi,
Nice brackets
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Old 21st December 2012, 12:27 PM   #603
lucylu is offline lucylu  England
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Default Testing

Hi I have tested both back-end power supplies ,work ok no problems but volts are +36.5 AND -36.7 ,,,,, +36.9 AND -36.8 at empty fuse holders are these to high or ok thanks john
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Old 21st December 2012, 12:43 PM   #604
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John: if no load is connected (fuse not inserted): your backend-PSU power rail-values are quite o.k.

Rudi
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Old 24th December 2012, 07:48 AM   #605
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by zsaudio View Post
I can not find any info about it on their web. Do you have a datasheet?
I found the datasheet:
http://www.linearsystems.com/datasheets/LSK489.pdf

It can be interesting to use in some other project.
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Old 24th December 2012, 11:06 AM   #606
zsaudio is offline zsaudio  Europe
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Quote:
Originally Posted by Telstar View Post
I found the datasheet:
http://www.linearsystems.com/datasheets/LSK489.pdf

It can be interesting to use in some other project.

Hi Telstar,

thanks for the datasheet, i'll read it. It looks like it has lower Ciss but lower transconductance too than the sk170 for the first glance.

I WISH YOU ALL A MERRY CHRISTMAS

zsaudio
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Old 24th December 2012, 11:58 AM   #607
jprco is offline jprco  Canada
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Hi, Rudi.
Any thoughts on my posts #598/600???
Merry Xmas all and Happy 2013.
Jean
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Old 24th December 2012, 12:38 PM   #608
Telstar is offline Telstar  Italy
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The low ciss can suit my application where I don't want a low lowpass filter. Hopefully samples will be available from distributors soon.

Merry Chirstmas to you and hopefully Santa will have left for me the fc100 kit
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Last edited by Telstar; 24th December 2012 at 12:40 PM.
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Old 26th December 2012, 09:51 AM   #609
lucylu is offline lucylu  England
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Default Adjustment

Well the time came to switch on and see if my hard work pays off,this is what i have on both pcb.
Switch on frontend only 2 x 34 ,shunt looks good all leds on except 2 red/green on front of backend.
switch frontend on 2x 25v all stays the same but bulb tester shines brightly and same two leds off meter reads 36mv
If i try to ajust pot r22(upwards) then bulb tester starts to dim and resistor r28 (10r) starts to smoke.
Switch off shunt bulb tester goes out and both leds red/green come on
After reading old posts see Rudi s post 186 looks similar. can anyone advise please regards john
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File Type: jpg DSCF0004.JPG (331.2 KB, 359 views)

Last edited by lucylu; 26th December 2012 at 10:16 AM.
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Old 26th December 2012, 11:43 AM   #610
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Jean,

when I built and adjusted my FC-100 (the real one, not the prototype!), I had similar "problems" as you have.
One channel (heatsink) remained "lukewarm", the other one got much warmer (allthough I was able to adjust it correctly as well).

I found the reason for this after some measurements: 5 of the internal TT-diodes had a Vf of approx. 510 - 530mV
and the 6th diode had a Vf of about 560mV.

I then bypassed the 560mV - TT-diode by a jumper - and: now both channels (heatsinks) maintain the same temperature.
So: please measure the Vf across all TT-diodes of the "hotter" channel and bypass the diode with the highest Vf.

Best regards - Rudi
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