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Old 29th October 2003, 08:18 PM   #41
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by GRollins

Grumble, grumble, grumble...
Grey
Grey, are you sure...well probably you are...but just in case, was your file smaller than 800x600?

/Hugo - eagerly waiting for the .jpg
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Old 29th October 2003, 08:34 PM   #42
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Grey, maybe the graphic files are limited in size AND resolution
but there's nothing said about it
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Old 29th October 2003, 09:45 PM   #43
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I understand the issue of Peletiers moving heat from one surface to another. But, does the hot surface need to be cooled? Does the heat removed from the source and that generated by the Peletier device need to be dissapated or does the Peletier device sustain a temperature differential between the two sides? Or, even if it does sustain a temperature differential, is the temperature difference simply brought up to a higher level? Hypothetically speaking, say 5 C one side and 30 C the other and then when the cold surface is brought up against the hot surface does it become something like 25 C one side and 50 C the other.

I have noticed that Peletie devices are often sold with cooling fans. I considered this for a while then I got hooked on the GC thing and haven't considered it much since.

Vic
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Old 29th October 2003, 11:09 PM   #44
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A peltier is simply a "heat pump"
It literally takes the heat from the component on it's cold surface, and sends it to the hot surface

you absolutely need to cool the hot surface!!! Use it uncooled for half a minute, you'll be surprised. It will heat so much that the powering wires will unsolder them (that hapened on one I had. If it's normal, or if it was bad soldered, I don't know)


Peltiers aren't meant to be used there. You'll have to dissipate even more heat (the transistor's one + the peltier's one)

Peltiers are used for cooling components below the ambiant temperature, something you can't do with classical air cooling. But they require more air cooling on the peltier that without it

If you have difficulties to cool your transistors, adding a peltier will give you even more difficulties
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Old 29th October 2003, 11:24 PM   #45
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Grey, could you please email the graphic to the webmaster email address and I'll try to work out what is going on ... this is the 2nd report I've had but try as I might, I've been unable to replicate the problem.
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Old 30th October 2003, 12:22 AM   #46
vic2 is offline vic2  United States
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Bricolo,

That's what i figured. It makes sense.

Vic
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Old 31st October 2003, 01:34 AM   #47
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Default The Follower of Zen

Okay, let's try this again...
Just something to kinda stimulate discussion.
Attached Images
File Type: gif zenfollo.gif (6.9 KB, 1098 views)
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Old 31st October 2003, 02:41 AM   #48
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this follower is going to need to hear a sermon
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Old 31st October 2003, 02:54 AM   #49
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It's for those who were upset over the high parts count in the Son of Zen. (Ahem...)
As a fringe benefit, the damping factor is higher and the heat dissipation lower. Distortion will also be somewhat lower, in that followers have 100% local degenerative feedback.
The caveat is that, being a follower, it will require a fair amount of gain from stages upstream, whether they be preamps, active crossovers, or whatever. Like the original SOZ, it will be happiest with a balanced input.
Naturally, you can replace the 8 ohm resistors under the MOSFETs with current sources, which will make things even more efficient, but that's another post for another day.

Grey
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Old 31st October 2003, 03:24 AM   #50
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Well, that must be close to a record for simplicity....
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