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Roender's FC-100 prototype and builder's thread
Roender's FC-100 prototype and builder's thread
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Old 20th November 2012, 09:37 AM   #541
lucylu is offline lucylu  England
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Hi Finished the small pcb s,, time to start on the big two and that means the case goodie regards john
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Old 20th November 2012, 09:44 AM   #542
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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I love pictures, John! Thank you very much for yours!
The small parcel is already on its way to you!

Best regards - Rudi_Ratlos
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Old 20th November 2012, 10:24 AM   #543
lucylu is offline lucylu  England
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Default case size

Rudi I am making my case as yours alu plate over heat sink,lookin at pictures i would say size is about 400 deep 200 high and 400 wide is this about correct thanks regards john
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Old 20th November 2012, 10:35 AM   #544
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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John, the 2 heatsinks that I am using as side-panel, have a size of 380 x 170mm. The ALU bottom-plate, on which I have screwed the 2 heatsinks,
has a size of 370 x 160mm and is 10mm thick.

This heatsink is never getting more than "hand-warm", regardless of how loud I play music.

Best regards - Rudi_Ratlos
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Old 20th November 2012, 10:40 AM   #545
AndrewT is offline AndrewT  Scotland
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what is Tc?
A sign that Rth c-s is bad is a sink that does not get hot when dissipation predicts such.
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Old 20th November 2012, 10:51 AM   #546
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Andrew, I do not have an appropriate thermometer to measure the heatsinks's temperature.

"Hand-warm" means: I am always able to put my fingers on the heatsinks without saying: "Ouch" ("Autsch" - in German language).
Maybe about 50-60 degrees. I don't know.
I will know, after I have finished my "DS1820 - temperature-sensor" - little project.

Best regards - Rudi_Ratlos

P.S. The major indication for adequate heat-dissipation is: the NJL - transistors themselves do not get "hot"!

Last edited by Rudi_Ratlos; 20th November 2012 at 11:02 AM.
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Old 20th November 2012, 09:32 PM   #547
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by zdr View Post
@Rudi&Metal: If you would like to discuss Mihai's design, maybe you should consider doing it in RMI-FC100 thread. We are derailing this one into something I do not like too much, and would probably dislike even more if I was the designer of FC100. I have a great respect for Mihai's work, and would not want to end up building Symasym, FetZilla or lawn mower with FC100 boards from this thread. I don't know about the rest of the guys, but unless PCBs respect the original proven and tested design, I think I will pass for now.

Sorry if I am getting too sensitive about all this, I still think you guys are doing a great job
QFT
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Old 21st November 2012, 06:23 AM   #548
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by zsaudio View Post
I was playing with the LTP. I compared 2SK369BL and 2SK170BL

Idss of 2sk170BL 9,31mA/9,31mA other pair 9,34mA/9,34mA
Idss of 2sk369BL 9,40mA/9,43mA other pair 9,45mA/9,49mA

Result of Right channel about 30Wrms 6R resistive load.
Please do not take the high order harmonics into account since those are comming from my sinus generator.

THD1 LTP 2SK170BL:
Attachment 275684

THD1 LTP 2SK369BL:
Attachment 275685

Using 2SK369 in the LTP i can feel more air the vocals are much more defined i can hear the smallest breath.
Hmm... the 2sk369 has more Ciss but more Yfs, maybe the transconductance rules here
Can you get and try LSK489?
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Old 21st November 2012, 11:18 AM   #549
zsaudio is offline zsaudio  Europe
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Hello Telstar,

did you mean lsk389?
It would be nice to try but i plan to drop bf862 into the ltp and see how it works.
Cheers
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Old 21st November 2012, 03:41 PM   #550
lucylu is offline lucylu  England
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Locked in my workshop (spare bedroom) easy to make a mistake john
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