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Old 16th June 2008, 03:00 AM   #1211
udailey is offline udailey  United States
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I had no intentions of sealing it entirely. I wanted an inverted graduated cylinder at the top. That way filling it is easy and the steam has an escape. Not going to do it anymore, but I was thinking how I could use the thermistors to trigger a pump to move water from one tank to another whenever the temp increased past 55C. But thats a lot of water to keep it at 55 without a fresh water supply and a drain.
Uriah
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Old 16th June 2008, 03:35 AM   #1212
udailey is offline udailey  United States
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Now that I think about it some more, it would take a really long time for 100 watts, for example, to boil water. If I used a one gallon container it would take 8092 BTUs (2371 WattHours) to get it to boil but thats not even considering heat loss of the water. I think I will keep an eye out for an aluminum container. See, I could vary the amount of water in it to keep the transistors at a steady temp. There has to be a happy medium somewhere.
Uriah
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Old 16th June 2008, 02:10 PM   #1213
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Assuming your boards will sit underneath the water tank, I'd be very curious to see how you adjust the amp after it's warmed up ;-)

Will it require a scuba mask and snorkel maybe?

I say do it just so you can take pictures of it to show your grandchildren.
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Old 16th June 2008, 02:30 PM   #1214
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A number of sources (some apocryphal) indicate that the expectation of device failure doubles for every 10 degree C rise in temperature. I saw this quoted in an SMPS textbook a few years back. Other sources say that the adage is somewhat misleading.
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Old 16th June 2008, 07:11 PM   #1215
udailey is offline udailey  United States
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Twitchie,
Assuming I do this it does not seem that I will need an aquarium sized tank I was thinking side mounted a few inches from the bottom but closer to bottom than not since thats where the colder water is.
Jack,
I saw that last night to... the 10 degree thing. In this case it was in reference to a CPU which has 90nm traces so heat REALLY matters in that case. It might be the same here to.
Uriah

aside:

Finished my Audio Nirvana 12" Bass Reflex enclosures a few minutes ago. Listening and enjoying right now. They really are nice and a big improvement over my Floor Standing Fonkens. Obviously bass is much better. Imaging is better. They have had no break in period yet. The voices are not as "forward" as with the Fostex based Fonkens but then again I wasnt sure I liked the forwardness of the Fostex when I first started listening so I guess I have to give it a week or so before I decide which I like better in that aspect. Piano and acoustic guitar is fantastic as it is in the Fonkens. Better than anything I have hooked up to my amps so far
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Old 18th June 2008, 04:05 PM   #1216
EUVL is offline EUVL  Europe
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The WMF file attached is the balanced circuit as built, using 4x Toshiba MOSFETs :

http://www.diyaudio.com/forums/showt...35#post1538835

One way to see full details is to import the wmf file into Word or Powerpoint.


Patrick


Disclaimer :

Not checked or approved by the original creator of the circuit.
Build at own risk.
Attached Files
File Type: zip f5 balanced toshiba.zip (10.6 KB, 1728 views)
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Old 18th June 2008, 08:15 PM   #1217
juma is offline juma  Germany
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Hi Patrick, can you please post a schematics in higher resolution - it's not clear where the connections are (cross point in JFETs source resistors) and component values are unvisible ?
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Old 18th June 2008, 08:31 PM   #1218
Magura is offline Magura  Denmark
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Quote:
Originally posted by jackinnj
A number of sources (some apocryphal) indicate that the expectation of device failure doubles for every 10 degree C rise in temperature. I saw this quoted in an SMPS textbook a few years back. Other sources say that the adage is somewhat misleading.

This is not far from what I'd consider a fact. In my experience upping the temperature to the specified max. (current VS. temp.) makes the thingie go south within roughly 1000hrs.
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Old 19th June 2008, 04:55 AM   #1219
EUVL is offline EUVL  Europe
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> can you please post a schematics in higher resolution - it's not clear where the connections are (cross point in JFETs source resistors) and component values are unvisible ?

It is a Windows Metafile and not JPEG.
The resolution is only poor if you open it with a photo editor sort of program.

What you could do is save it first. Open a new Word document (A3 Landscape), "insert graphics from file", then you will see all details in the highest resolution you might ever need.


Regards,
Patrick
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Old 19th June 2008, 10:37 AM   #1220
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Patrick,

Can you please post a pcb(pdf) or gerber?

Mike
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