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Old 6th December 2013, 07:29 AM   #871
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Paul, I do not know any suitable polypropylen capacitor either.
I am either using polyester capacitors (for example: VISHAY MKT1822) or WIMA MKS4, which uses a PET foil.

Best regards - Rudi_Ratlos
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Old 6th December 2013, 03:30 PM   #872
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by wineds View Post
What is the best option for the input DC blocking cap? It should be 3.3 to 3.9uF according to Andrew? ........
I have gone back through all the last 220posts.
Can you refer me to the post.
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Old 6th December 2013, 09:54 PM   #873
wineds is offline wineds  Australia
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Quote:
Originally Posted by Rudi_Ratlos View Post
Paul, I do not know any suitable polypropylen capacitor either.
I am either using polyester capacitors (for example: VISHAY MKT1822) or WIMA MKS4, which uses a PET foil.

Best regards - Rudi_Ratlos

Thanks Rudi!
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Old 6th December 2013, 09:54 PM   #874
wineds is offline wineds  Australia
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Quote:
Originally Posted by AndrewT View Post
I have gone back through all the last 220posts.
Can you refer me to the post.
Hi Andrew, I was referring to this post in the original GB thread as cited in the builders manual :

Roender's FC-100 Rev.1 Group-Buy
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Old 7th December 2013, 10:21 AM   #875
AndrewT is offline AndrewT  Scotland
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OK, now I see.
The time constant around 85ms to 100ms suits me. But it must also suit the abilities of the amplifier.

That was the point I was making.

Stating capacitance alone without the resistance value tells us nothing. It's a filter and both parts of the filter require specification.
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Old 22nd January 2014, 09:39 AM   #876
atupi is offline atupi  Romania
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Solved bias issue by exchanging all the 0281/0302's. I was complaining last year about my bias was rising slowly with temperature and becoming suddenly unstable.

I have discovered that my transistors has some diode problems also quite high Vfe. The old ones has Vfe diode around 0.520V and the new working ones are very close to 0.500V.

It seems that Onsemi has some problem in the past with thermaltrack diodes.
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Old 4th April 2014, 12:15 AM   #877
wineds is offline wineds  Australia
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Originally Posted by andreasw View Post
@atupi
On the picture you can see how it works.
I took 2 Conrad heatsinks (350x150x60mm), 8 Aluminum angles and a plate of 3mm Aluminum.
The plate doesen´t reach the heatsinks there is a 10mm slut.
With the holes in the top plate there is enough air circulation.

At first the amp has to play some hours.
Later I will write something about the sound in comparsion to an Aleph J and Symasym (at this moment ...).

Regards
Andreas
Andreas, can you please tell me where you bought the Aluminum angles?
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Old 6th June 2014, 12:14 PM   #878
wineds is offline wineds  Australia
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What is the consensus regarding loudspeaker protection? Do I need to use one with the FC-100?
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Old 6th June 2014, 12:20 PM   #879
AndrewT is offline AndrewT  Scotland
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If YOU consider your speakers as "expensive" then YOU decide if you want to protect them.

It has nothing to do with the amplifier type, nor it's design.
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Old 6th June 2014, 12:23 PM   #880
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Excuse me that saw your question so late.

The Aluminum angles are self made (like everything of the case except the heatsinks).
I cut them of a big one in pieces of 20mm and drill the holes.

The first test I did with the speaker protection and later I took it out.

Regards
Andreas
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