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Old 18th March 2013, 08:52 PM   #831
xrk971 is online now xrk971  United States
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What's the dissipation of the two MOSFETS in the ACA?
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Old 18th March 2013, 09:03 PM   #832
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That's above my pay grade. Sounds like a question for Andrew T.
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Old 18th March 2013, 09:45 PM   #833
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by bcmbob View Post
That's above my pay grade. Sounds like a question for Andrew T.
Don't you need to know that to design the heat sinks and water cooling business? I am just guessing based on fact that power supply is typically a 60 W SMPS brick and the amp puts out no more than 5 W. So circa 55 W?
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Old 18th March 2013, 09:51 PM   #834
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Quote:
Originally Posted by xrk971 View Post
What's the dissipation of the two MOSFETS in the ACA?
With 19v supply and 1 amp bias is 19w per channel.

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Old 18th March 2013, 10:22 PM   #835
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Sorry, No engineering in my approach.

My standards are quite simple - small/compact, no leaks and quiet. The tendency is to overbuild, but I've been informed some discrete devices need a minimum temperature for proper operation. That's new to me as there is no such thing as too much chill in PC applications.

My "lab" is just a laser temp gun and a thermocouple attached to a DMM. The scientific investigation phase is simply twisting the knobs on a pair of rheostats for fan and pump speed

"They told me there wouldn't be any math on this test"
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Last edited by bcmbob; 18th March 2013 at 10:31 PM.
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Old 18th March 2013, 10:33 PM   #836
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Quote:
Originally Posted by xrk971 View Post
I am new here in this forum so this may be a stupid question. Has anyone considered using the heat of vaporization (h_fg in thermodynamics parlance) of water as a heat sink for hot burning class-A amps? Water is able to remove huge amounts of heat as a substance for heat transfer, it is almost without equal. I am not talking about sensible heat capacity like in a liquid flow heat exchanger but something really simple - a pot of water.
Thank God there are more crazy guys like me out there.

Love the idea, just remember to use destilled water. Also why don´t you try to cool down the water a little bit.

RGDS

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Old 19th March 2013, 03:18 PM   #837
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All fun to imagine, but the original comment by XRK971 was about the cost of the kit heat sinks.

If any of the previous mental experiments get implemented, I suspect they will be larger and more expensive than the modest cost of the heat sinks.

End result being a cheap, simple compact monoblock that is no longer cheap, simple and compact.

To each their own I suppose.
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Old 19th March 2013, 04:11 PM   #838
bcmbob is offline bcmbob  United States
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Quote:
Originally Posted by fastbike1 View Post

If any of the previous mental experiments get implemented, I suspect they will be larger and more expensive than the modest cost of the heat sinks.
That's correct - no disagreement there. My major interest in the liquid cooling concept is best suited to the high power, high heat builds. As stated earlier, some of the massive heat sink amps have an aesthetic appeal that is attractive and visually impressive.

[IMG]Click the image to open in full size.[/IMG]


Liquid cooling simply introduces a size reduction potential along with a bit of control over operating temps.

Not a world changer - but a fun, and hopefully useful approach to heat management.

I fear X and I have taken the conversation to a place that might not fit in the ACA world. I'll let it be and comment on more appropriate threads.
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Last edited by bcmbob; 19th March 2013 at 04:33 PM.
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Old 21st March 2013, 01:48 AM   #839
xrk971 is online now xrk971  United States
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Ok, so I have put all my parts into Digikey and am about to place the order. They were out of 0.68 ohm 3 watt resistors, is it OK to substitute 0.62 ohm resistors? Also, is linear systems the only place to get the LSK170 transistor?
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Old 21st March 2013, 08:52 AM   #840
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Did you try Spencer at FETAudio?
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