Aleph 5

tonistefanovski · 6th February 2006, 09:22 AM

Will be finnished very soon........
Regards,
Toni

jacco vermeulen · 6th February 2006, 09:37 AM

You expect these heatsinks to handle the heat like this ?

tonistefanovski · 6th February 2006, 09:50 AM

Why, you mean that they will not to be good enough...
Regards,

jacco vermeulen · 6th February 2006, 10:02 AM

Each of the heatsinks will need to handle 75 watts if you are going for the nominal power output.
At 30 degrees temperature rise that translates to a thermal heatsink factor of 0.4
If you mount them like you did, with the flanges horizontal, the thermal factor will drastically reduce.
They'll probably need to have a 0.2 thermal resistance to keep the temperature low enough.
Based on the size of a Rifa capacitor your heatsinks look to be something like 8"x 16"
My guess would be that your heatsinks will reach 70C at least.
If you have the option to cut them in half, rotate the heatsinks 90 degrees and mount them side by side, they have a much better chance to handle that much heat.

tonistefanovski · 6th February 2006, 10:06 AM

The size of the heat sinks are 18 x 12 inch. On each heat sinks will be mounted 3 fets. I think it would be enough. I know that orientation of sinks are not as should be, but I have to do that because of many factors. Thank's.....
Toni,

jacco vermeulen · 6th February 2006, 10:10 AM

Good luck, please post the outcome.

tonistefanovski · 6th February 2006, 10:16 AM

Thank you I will, I hope very soon. May I ask you something.... I'm using standard capcitors (those 220mF-YAGEO). Some where I've readed that I have to put 0.470mF across them, is that correct???
Regards,

jacco vermeulen · 6th February 2006, 10:31 AM

Yes, bypassing an electrolytic that has the signal across it by a foil capacitor is always an improvement.
And you can also bypass the zener.

tonistefanovski · 6th February 2006, 10:37 AM

It means that all capacitors should be bypassed, correct??? About zener diode, I assume that you mean for Z5...!!!!
Thank's

jacco vermeulen · 6th February 2006, 10:54 AM

Quote:

Originally posted by tonistefanovski
I assume that you mean for Z5

Correct, the zener for the current source. That is Z5 in the service manual.

6th February 2006, 09:37 AM	#2
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	You expect these heatsinks to handle the heat like this ? __________________ Not so much,.......if it says "ZM" in the corner.

6th February 2006, 10:02 AM	#4
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Each of the heatsinks will need to handle 75 watts if you are going for the nominal power output. At 30 degrees temperature rise that translates to a thermal heatsink factor of 0.4 If you mount them like you did, with the flanges horizontal, the thermal factor will drastically reduce. They'll probably need to have a 0.2 thermal resistance to keep the temperature low enough. Based on the size of a Rifa capacitor your heatsinks look to be something like 8"x 16" My guess would be that your heatsinks will reach 70C at least. If you have the option to cut them in half, rotate the heatsinks 90 degrees and mount them side by side, they have a much better chance to handle that much heat. __________________ Not so much,.......if it says "ZM" in the corner.

6th February 2006, 10:10 AM	#6
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Good luck, please post the outcome. __________________ Not so much,.......if it says "ZM" in the corner.

6th February 2006, 10:31 AM	#8
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Yes, bypassing an electrolytic that has the signal across it by a foil capacitor is always an improvement. And you can also bypass the zener. __________________ Not so much,.......if it says "ZM" in the corner.

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6th February 2006, 09:50 AM	#3
tonistefanovski diyAudio Member Join Date: Jun 2005 Location: Skopje,Macedonia	Why, you mean that they will not to be good enough... Regards,

6th February 2006, 10:06 AM	#5
tonistefanovski diyAudio Member Join Date: Jun 2005 Location: Skopje,Macedonia	The size of the heat sinks are 18 x 12 inch. On each heat sinks will be mounted 3 fets. I think it would be enough. I know that orientation of sinks are not as should be, but I have to do that because of many factors. Thank's..... Toni,

6th February 2006, 10:16 AM	#7
tonistefanovski diyAudio Member Join Date: Jun 2005 Location: Skopje,Macedonia	Thank you I will, I hope very soon. May I ask you something.... I'm using standard capcitors (those 220mF-YAGEO). Some where I've readed that I have to put 0.470mF across them, is that correct??? Regards,

6th February 2006, 10:37 AM	#9
tonistefanovski diyAudio Member Join Date: Jun 2005 Location: Skopje,Macedonia	It means that all capacitors should be bypassed, correct??? About zener diode, I assume that you mean for Z5...!!!! Thank's

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