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Old 6th February 2006, 09:22 AM   #1
tonistefanovski is offline tonistefanovski  Macedonia
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Default Aleph 5

Will be finnished very soon........
Regards,
Toni
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Old 6th February 2006, 09:37 AM   #2
jacco vermeulen is offline jacco vermeulen  Netherlands
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You expect these heatsinks to handle the heat like this ?
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Old 6th February 2006, 09:50 AM   #3
tonistefanovski is offline tonistefanovski  Macedonia
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Why, you mean that they will not to be good enough...
Regards,
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Old 6th February 2006, 10:02 AM   #4
jacco vermeulen is offline jacco vermeulen  Netherlands
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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.
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Old 6th February 2006, 10:06 AM   #5
tonistefanovski is offline tonistefanovski  Macedonia
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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,
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Old 6th February 2006, 10:10 AM   #6
jacco vermeulen is offline jacco vermeulen  Netherlands
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Good luck, please post the outcome.
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Old 6th February 2006, 10:16 AM   #7
tonistefanovski is offline tonistefanovski  Macedonia
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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???
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Old 6th February 2006, 10:31 AM   #8
jacco vermeulen is offline jacco vermeulen  Netherlands
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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.
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Old 6th February 2006, 10:37 AM   #9
tonistefanovski is offline tonistefanovski  Macedonia
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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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Old 6th February 2006, 10:54 AM   #10
jacco vermeulen is offline jacco vermeulen  Netherlands
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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.
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