fan cooled gainclone

steven344 · 20th November 2005, 08:13 PM

Here is a stereo bridged clone using computer cpu heatsinks and fan to cool it,advantage of small size.Fan are controled with chip that changes fan speed dependant upon heat

metal · 20th November 2005, 09:30 PM

Hello steven344

Nice work in deeeeed, I use a FAN, but not controlled, seems interesting to add one now, what chip did you use, and what sensor.

n00beR · 20th November 2005, 10:07 PM

I dont know if this is what steven344 has done, but you could use a voltage regulator, in conjunction with a thermistor to regulate the voltage going to the fan.

Just an idea.

here is a link to get you started.

n00b

metal · 21st November 2005, 04:25 AM

Hello n00beR

Brain cooling ideas in deed, thats very good one.... thanks alot man

I_Forgot · 21st November 2005, 04:56 AM

I'm not sure why anyone would need a fan to cool these amp chips, but if it is getting hot, and it isn't oscillating, then you may want to consider this:

The fan will cool the chip after it gets hot, but the package and heatsink have pretty long thermal time constants. By the time your temperature sensor heats up enough to kick on/up the fan, the die inside the package may already be frying. You can sense the current drawn by the amplifier and use that to trigger the fan turn-on/speed up. Here is an article that gives the details:

http://www.elecdesign.com/Articles/A...5695/5695.html

I_F

youyoung21147 · 21st November 2005, 04:45 PM

Is the fan really necessary on such big heatsinks ??

Cooling is always welcome on this kind of thing, but if you take the main trafo's supply, it may pollute the PSU because brushless fans switch the motor phases.

Hope it isn't too noisy

Upupa Epops · 21st November 2005, 04:54 PM

Little bit " nonaerodynamical " tunnel, isn't it thruth ?

karma · 21st November 2005, 05:05 PM

ya but it a fan, makes the amp APPEAR more Powerful and it looks cool

carlosfm · 21st November 2005, 06:23 PM

Quote:

Originally posted by I_Forgot
I'm not sure why anyone would need a fan to cool these amp chips, but if it is getting hot, and it isn't oscillating, then you may want to consider this:

Those are CPU (P4?) heatsinks, not big enough for a bridge amp.
The fans are recommended here, if you use small heatsinks, well done.

Quote:

Originally posted by youyoung21147
Is the fan really necessary on such big heatsinks ??

They are not big, the pic is misleading, I know those, I have some of those CPU heatsinks.
They are fine for two chips, but not in bridge mode

Quote:

Originally posted by youyoung21147
Cooling is always welcome on this kind of thing, but if you take the main trafo's supply, it may pollute the PSU because brushless fans switch the motor phases.

Hope it isn't too noisy

Oui, vous être correcte, a small trafo and independent PSU should be used for the fans.

youyoung21147 · 21st November 2005, 07:04 PM

I'w even wondering if this phase switching is not causing some EMI/RFI that could travel in the air to the amplifier, despite the metal heatsink between the chip and the fan.

20th November 2005, 10:07 PM	#3
n00beR diyAudio Member Join Date: Mar 2004 Location: efiF	I dont know if this is what steven344 has done, but you could use a voltage regulator, in conjunction with a thermistor to regulate the voltage going to the fan. Just an idea. here is a link to get you started. n00b __________________ ::bleh::

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20th November 2005, 09:30 PM	#2
metal diyAudio Member Join Date: Jan 2004	Hello steven344 Nice work in deeeeed, I use a FAN, but not controlled, seems interesting to add one now, what chip did you use, and what sensor.

21st November 2005, 04:25 AM	#4
metal diyAudio Member Join Date: Jan 2004	Hello n00beR Brain cooling ideas in deed, thats very good one.... thanks alot man

21st November 2005, 04:56 AM	#5
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	I'm not sure why anyone would need a fan to cool these amp chips, but if it is getting hot, and it isn't oscillating, then you may want to consider this: The fan will cool the chip after it gets hot, but the package and heatsink have pretty long thermal time constants. By the time your temperature sensor heats up enough to kick on/up the fan, the die inside the package may already be frying. You can sense the current drawn by the amplifier and use that to trigger the fan turn-on/speed up. Here is an article that gives the details: http://www.elecdesign.com/Articles/A...5695/5695.html I_F

21st November 2005, 04:45 PM	#6
youyoung21147 diyAudio Member Join Date: Apr 2005 Location: Belfort	Is the fan really necessary on such big heatsinks ?? Cooling is always welcome on this kind of thing, but if you take the main trafo's supply, it may pollute the PSU because brushless fans switch the motor phases. Hope it isn't too noisy

21st November 2005, 04:54 PM	#7
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Little bit " nonaerodynamical " tunnel, isn't it thruth ?

21st November 2005, 05:05 PM	#8
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	ya but it a fan, makes the amp APPEAR more Powerful and it looks cool

21st November 2005, 07:04 PM	#10
youyoung21147 diyAudio Member Join Date: Apr 2005 Location: Belfort	I'w even wondering if this phase switching is not causing some EMI/RFI that could travel in the air to the amplifier, despite the metal heatsink between the chip and the fan.

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