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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 15th March 2013, 08:26 PM   #701
atupi is offline atupi  Romania
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Default Work in progress ...

I want to show you some pictures of my work.
This pcb's are just lovely and my soldering iron is very happy with them
Still missing some parts but hope to have it soon.
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File Type: jpg IMG_1797.JPG (93.9 KB, 508 views)
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Old 17th March 2013, 09:36 PM   #702
atupi is offline atupi  Romania
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I intend to buy some cheap heatsinks for the first tests before i sped some big $$$ on some fancy case from modushop.
Would be this heatsink ok for preliminary tests: Radiator aluminiu - 160x110x32 mm-1322 - Okazii (121721113) ? (160x110x32 mm)

Adrian
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Old 18th March 2013, 09:15 AM   #703
AndrewT is offline AndrewT  Scotland
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It will run very hot. I guess Ts>>50C and possibly >70C
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Old 18th March 2013, 09:50 AM   #704
atupi is offline atupi  Romania
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Andrew for wich power output you made that calculations ? I was having in mind not running at full power, maybe 20-30W.
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Old 18th March 2013, 10:05 AM   #705
AndrewT is offline AndrewT  Scotland
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It's not power output that is the problem.
It's quiescent power dissipation.

At normal running condition where average power output is <1% (<-20dB ref max) of maximum power output you will find that the heatsink temperature does not appear to change whether delivering that W or not.
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Old 18th March 2013, 10:11 AM   #706
Rudi_Ratlos is offline Rudi_Ratlos  Germany
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Adrian, the power dissipated by a FC-100 channel in idle status alone is about 35W!
An adequate heatsink should have a performance of about 0.5 C/W.

Do you have a small fan to assist cooling during the build-phase? Then you can use the heatsink shown.

Best regards - Rudi_Ratlos
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Old 18th March 2013, 10:27 AM   #707
atupi is offline atupi  Romania
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Thanks for your advice Rudi!
I think i can find some old computer cooler to use.
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Old 22nd March 2013, 08:01 PM   #708
atupi is offline atupi  Romania
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Finally i've received 2SA/2SC transistors and as with MJE's is impossible to find PNP-NPN matched pairs but i have an idea and i ask you to tell me if i'm wrong or not.
In the attached picture i see two Sziklai pairs and i was thinking to "match" the equivalent beta of the Sziklai compounds.
Is my thinking correct ?

Click the image to open in full size.
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Old 23rd March 2013, 04:56 AM   #709
franzm is offline franzm
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At dc it works perfect. For ac you should simulate the circuit and see what effect the imbalance of the corresponding transistors has on distortion.
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Old 23rd March 2013, 01:09 PM   #710
Telstar is offline Telstar  Italy
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Change the models with the measured beta and try, I think is a good idea.
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