Pass Son of Zen w/current sources (etc.) - Page 5

Netlist · 29th October 2003, 08:18 PM

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

Bricolo · 29th October 2003, 08:34 PM

Grey, maybe the graphic files are limited in size AND resolution
but there's nothing said about it

vic2 · 29th October 2003, 09:45 PM

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

Bricolo · 29th October 2003, 11:09 PM

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

AudioFreak · 29th October 2003, 11:24 PM

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.

vic2 · 30th October 2003, 12:22 AM

Bricolo,

That's what i figured. It makes sense.

Vic

GRollins · 31st October 2003, 01:34 AM

Okay, let's try this again...
Just something to kinda stimulate discussion.

moe29 · 31st October 2003, 02:41 AM

this follower is going to need to hear a sermon

GRollins · 31st October 2003, 02:54 AM

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

Variac · 31st October 2003, 03:24 AM

Well, that must be close to a record for simplicity....

29th October 2003, 11:24 PM	#45
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	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. __________________ - Dan

31st October 2003, 03:24 AM	#50
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	Well, that must be close to a record for simplicity.... __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

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29th October 2003, 08:34 PM	#42
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Grey, maybe the graphic files are limited in size AND resolution but there's nothing said about it

29th October 2003, 09:45 PM	#43
vic2 diyAudio Member Join Date: Mar 2003 Location: Michigan	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

29th October 2003, 11:09 PM	#44
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	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

30th October 2003, 12:22 AM	#46
vic2 diyAudio Member Join Date: Mar 2003 Location: Michigan	Bricolo, That's what i figured. It makes sense. Vic

31st October 2003, 02:41 AM	#48
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	this follower is going to need to hear a sermon

31st October 2003, 02:54 AM	#49
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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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