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Old 10th October 2012, 03:57 AM   #1831
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I did see your heat spreader and must admit I was skeptical. I am interested to see what you think when you are cooking with all 8 outputs going. According to the original F5 article I am using for my guide. Each mono block will require about 384 square inches of heat sink. I can't see how I am going to tie all that together with the sinks I have. I will say my F5 runs only warm to the touch with suggested heatsinking.
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Old 10th October 2012, 02:30 PM   #1832
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it is alot more to it then that. it's all about the shape. a wide and low sink is much better then a narrow and high sink. even if the last one has 50% more surface area.
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Old 10th October 2012, 03:21 PM   #1833
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Exactly Mr AudioSan
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Old 10th October 2012, 04:27 PM   #1834
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That is a side view of my F5. Showing one channel worth of sink. The F5T will have 4 times that per channel. So if running wires is a no no, then I will have to buy or design long PCB's like Mr. sachu's. I have a very fine laser thermometer that shows very little difference from top to bottm or side to side in temp.Click the image to open in full size.
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Old 10th October 2012, 04:35 PM   #1835
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Dont disagree that temps are good, you are jusr losing a pretty decent amount of efficiency in the use of you sink. Youcouldsplit it in half and actually have more dissipstion capability.
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Old 10th October 2012, 05:13 PM   #1836
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Quote:
Originally Posted by rubofdagreen View Post
That is a side view of my F5. Showing one channel worth of sink. The F5T will have 4 times that per channel. So if running wires is a no no, then I will have to buy or design long PCB's like Mr. sachu's. I have a very fine laser thermometer that shows very little difference from top to bottm or side to side in temp.Click the image to open in full size.
I have four sets of PCBs available for F5V2 Dual mono design(2Xamp boards+2XPower supply Bpards and +1 Rectifier).Pm me if anyone wants them.

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Sachin
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Old 11th October 2012, 08:24 AM   #1837
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We are building Dual mono design with 2 Power supply boards and two transformers.Each power supply board will have 8 caps of 10000uf 50V,so total 16 caps of 10000uf. Do you think we need more than 10000uf?
Yes,
your total of 16off 10000uF comes to just 160mF for the stereo ClassA amplifier. That is quite low.
We usually see a lot more than +-40mF in a big ClassA amplifier.

I would use +-40mF in a ClassAB 4ohm capable amplifier.
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Old 11th October 2012, 08:31 AM   #1838
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Yes,
your total of 16off 10000uF comes to just 160mF for the stereo ClassA amplifier. That is quite low.
We usually see a lot more than +-40mF in a big ClassA amplifier.

I would use +-40mF in a ClassAB 4ohm capable amplifier.
Thanks Andrew for suggestion.Could you suggest me proper value caps for this amp?We have not bought caps yet so your advise would help.

Regards,
Sachin
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Old 11th October 2012, 08:35 AM   #1839
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15mF would give +-60mF, 22mF would give +-88mF.
Either is more than 10mF.
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Old 11th October 2012, 03:38 PM   #1840
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Sachu, I would take those boards if you still have them.
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