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Old 29th May 2004, 05:31 PM   #1
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Default Gonne with the wind... the heat!

The heat goes out... small amplifier inside MDF thin enclosure.

Carlos
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Old 29th May 2004, 05:36 PM   #2
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Old 29th May 2004, 05:38 PM   #3
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one more
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Old 29th May 2004, 05:39 PM   #4
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Old 29th May 2004, 05:43 PM   #5
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Default A scrath down here.

It is already working...good bass.... reasonable treble and mid range can hear without be too nervous.

It is working hot fever... something around 50 degrees centigrades.

I have schematics, if someone want i will send directly...because everything has a owner is this earth.

Use darlington transistors and is mounted on heatsink, board and transistors... inside air conductor.

Use 5 transistors.

Carlos
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Old 29th May 2004, 08:22 PM   #6
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Destroyer X,

I am interested in your DIY "wind tunnel approach".

Please comment on the amount of fan and wind noise that results. I know there is a great variability in computer type fans so it would be interesting to know what you used and at what RPM to get your results.

I am using a quiet type reduced RPM fan to occasionally cool down an existing heatsink.

I have been intrigued about using a "wind tunnel" approach for a class A amp project but am unclear on whether the noise would be the same as what I would hear from the fan itself or whether it would be louder due to the "tunnel".

I also am not clear whether a reduced RPM fan will drive enough air to cool or whether you have to have a very high volume fan.
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Old 29th May 2004, 09:41 PM   #7
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Normally the noise of a wind tunnel is much higher compared to the fan itself.

Two ways to reduce noise:
1.
Do not put the fan without any distance to the heat sink.
If the rotor of the fan is to close to the heat sink you may get
bad turbulences. About 10mm distance may help to reduce this issue.
You can mount the fan with a 10mm foam ring to the heat sink. By this
you will ensure some distance, avoid turbulences and might be able to decouple the vibrations of the fan from the heat sink, and no air will be lost aside.
2.
In addition you could add an temperature depending speed control....

Have fun
Markus
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Old 29th May 2004, 11:10 PM   #8
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Default Do not know fan type

I bougth some of them in something alike E Bay.
Some came with problems and i could save 4 units.
I am using 8.5 volts to reduce speed and noise, are using two fans inside the wind tunnel fixed with rubber, also heatsink is fixed with rubber inside to make some smell if overheated.

Already working and using high power, temperature is around 50 degrées centigrades, but amplifier is class AB and maximum clean output is 35 watts each channel, can go more, but distorts.

This way i have around maximum 140 watts heat dissipation inside tunnel... really used 15 milimeters from fan to heat sink, and also i broke with sand and knives the corners are rounded.
On input and output sides of metal heatsink all corners are rounded, nothing with 90 degrees because make noise, also mdf case is fixed with rubber. i could not hear noise from those small computer fan, i reduce all volume and no noise....have to put my ear around 8 inches distance to perceive noise.

I have another one, the one i scan and you see... same size the one already working driving bass, speaker under my bed.

I am preparing to test on real world the last JLH amplifier, with simetrical supply and some transistor modifications, i will use this method to assemble one channel. i suppose will work with small fever temperature. Maybe something around 40 degrees centigrades, because this amplifier heat is less than 100 watts total for one channel.

One of the first JLH is alike Rodd Elliot "Death of Zen", this one, is the best amplifier i heard.

I will be happy to know what you assemble, also what chocoholic is using as home amplifier.

Please, inform that to me.

regards,

Carlos
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Brazilian Airways Christmas Message to all of you!
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Old 30th May 2004, 01:54 AM   #9
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Quote:
Originally posted by ChocoHolic

If the rotor of the fan is to close to the heat sink you may get
bad turbulences. fun
Markus

I believe that turbulence is good for heat removal though -- you want to elimate the laminar flow condition. Laminar flow = small layer of air right on the heasink that doesn't move.

I could be wrong but what I said sounds right to me at least.
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Old 30th May 2004, 09:35 AM   #10
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Default Now you put me to think about it... and hard!

This way...hummmmmm! a noise of hum is appearing because old neuronic brain is working hard and sucking hi power energy from condenser supply...voltage reducing, and filters can not hold such a current and when i think hard, also hum noises came together (smile, of course, joking)

By the way, you write some related electrons movement.... i was thinking too.... planets ans sun.... electron movement in other time dimension.... nebulosis can be some tissue, alive tissue?... inside some body... some living creature, in other dimension world.... can not go ahead... overcharge in my system! (over heat, i am old... cannot think too much!)

Hey choco, this man is putting me to think...heeelllllp!, turbulence will make more air pressure in some points i suppose, this can be good related this point, this place, this corner....but the entire air flow may be reduced by this rotating wind movement... as a resistance to air flow... am i close rigth.... completely wrong?... let me know....very interesting...real... i like to think those things and imagine those images in brain.

Carlos
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Brazilian Airways Christmas Message to all of you!
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