hifi said:
I was going to report you to the moderator but I'm feeling kind today...
well I don't know about you, but I'm listening to Elgar thru my crappy PC speakers which I collected from the corridor after someone decided to get rid of them and I'm telling you, they sound a-mazing ! (for the price) I'm not joking: for natural instruments and voices they're killers.
I've been trying to find out what brand the 3" paper cone drivers inside are without success. The stereo chip amp inside looks bog-standard and the power supply - well, let's not even discuss that. If you pester me enough, I'll open them up and have a look at the chip for you. In fact the only thing I think is bad about them is the placky box which rings. The make is "Typhoon" "sound system" btw. With a bit of luck you might find a pic on the web (not in their site.)
GregGC said:
Call me a cynic but I'm sure the people who are employed to design the chip case have thought about that. Otherwise the chip would "explode/crack" from it's own heat. Besides, if you're worried, use a low torque setting like Peter does and add another silicone insulated pad in between...
stelios said:
I know manufacturers use it and I'm not saying it's not going to work. Sure it provides more even preasure distribution over the chip. I just think that the implementation have to be very careful (not that Peter isn't) and maybe there is a bit more hidden stuff behind a picture. Like you suggested, double insulating pad or speciffics about the torque used or bracket material or ....
Re: material choice
Konnichiwa,
Of course. Dimensions matter as much. I will only mention here again that occult studies and occult numberology can give amazing insights.
Did you know that the movements of ALL Planets can be represented as notes on the primitive tonal scale? They don't make notes in the well tempered scale.
Music of the crystal spheres? Occult numberology and audio? Study of the Metals and origins?
You bet. Sounds like the seven hermetic arts to me.
Sayonara
Konnichiwa,
stelios said:
Of course. Dimensions matter as much. I will only mention here again that occult studies and occult numberology can give amazing insights.
Did you know that the movements of ALL Planets can be represented as notes on the primitive tonal scale? They don't make notes in the well tempered scale.
Music of the crystal spheres? Occult numberology and audio? Study of the Metals and origins?
You bet. Sounds like the seven hermetic arts to me.
Sayonara
I ment 220 ohm on +input,just to put some resistance on input.
Peter said he used 244ohm Vishay there.
220kohm - why???
I figured that my problem is some kind of microphonic/RFI/grounding oscillations.When I move my hands around the input RCA's and star ground point the noise modulates.
Bartek
zygibajt said:
If you are reffering to IGC 10k/220k with input cap, the closer to 220k the resistor from +In to GND the lower the output DC offset will be. The concept is described here :http://www.diyaudio.com/forums/showthread.php?postid=259680#post259680 though it refers to NIGC.
Greg
No Greg, here you are way off.
The method of mounting Peter uses here is also used by many manufacturers (like Naim) and is the better mounting method in most cases. The chip is bended less (very importand with broad ones like the LM) than mounted with a screw, the overall contact to the surface is better. The plastic case does not "expand" that much, not even in case of burning through. It is although necessary that the mounting force is substituted evenly on the surface, it is done normally by using non-bending blocks and a torque wrench.
Klaus
The method of mounting Peter uses here is also used by many manufacturers (like Naim) and is the better mounting method in most cases. The chip is bended less (very importand with broad ones like the LM) than mounted with a screw, the overall contact to the surface is better. The plastic case does not "expand" that much, not even in case of burning through. It is although necessary that the mounting force is substituted evenly on the surface, it is done normally by using non-bending blocks and a torque wrench.
Klaus
Re: Re: material choice
Can you tell me what notes do Neptune and Pluto do ? Cause their orbits intersect. And what note do Ceres, Vesta, and millions of other minor planets do ? Must be rather cacofonic.
How do you pick a note for a highly eccentric orbit like Mars' or Pluto's ? Or for a planet whose perihelion constantly shifts, like Mercury ?
Sound like lots of c#@p to me.
Glad guys like you are not designing my gas supply. Or brakes in my car.
Kuei Yang Wang said:
Can you tell me what notes do Neptune and Pluto do ? Cause their orbits intersect. And what note do Ceres, Vesta, and millions of other minor planets do ? Must be rather cacofonic.
How do you pick a note for a highly eccentric orbit like Mars' or Pluto's ? Or for a planet whose perihelion constantly shifts, like Mercury ?
Sound like lots of c#@p to me.
Glad guys like you are not designing my gas supply. Or brakes in my car.
GregGC said:
actually, as the thing heats up there'll be less compression 'cuz the metal bolts (longer lengths needed in this sort of arrangement) expands more.
So spring washers (nice beryllium copper ones are cheaply available) are useful, not to ease pressure, but to maintain it over the heat cycles.
you sure? as heat source, the chip is going to be warmer than the bolts off to the side. not much, but enough to compensate for the expansion difference perhaps? and what about the increasing thickness of the plates taking up some of the increasing length of the bolts? (or is that in the southern hemisphere?)
seriously, i'm not much worried about this and am just following along with an interesting quibble. i suspect that the chip is only in danger if the bolts are cranked down too tight; if stressed near fracture, the heating and cooling cycles will likely finish it off in a manner more akin to fatigue than one-time overpressure.
i do like the idea of a sprung system for high end amps though. maybe that can be taken care of more directly by careful selection of bolt and plate material & dimensions alone. plus keeping in mind you want springs that will keep sufficient tension throughout the temperature range.
(yes... i'm just going to tighten my own bolts down till they feel right. but if we must quibble, let's have a good run with it.)
That's how Rowland does it.
It would never occur to me that a chip could break because of it mounted this way. I once tried to break the chip myself, to see how the connections run inside. Believe me, it's not an easy task
Even if it expands, I would first see the bolt heads making dimples in a copper bar, the bar bending, the pad compressing, the thread giving out, before the chip breaks. This is a flexible assembly and it can't damage the chip.
An externally hosted image should be here but it was not working when we last tested it.
It would never occur to me that a chip could break because of it mounted this way. I once tried to break the chip myself, to see how the connections run inside. Believe me, it's not an easy task
Even if it expands, I would first see the bolt heads making dimples in a copper bar, the bar bending, the pad compressing, the thread giving out, before the chip breaks. This is a flexible assembly and it can't damage the chip.
blurb:
"A range of beryllium copper crinkle washers in both metric sizes. These washers have good corrosion resistance, are non-magnetic, and have high resistance to permanent set under compression. They have a number of uses including use as vibration-proof locking washers that will not mark or damage panel surfaces."
"A range of beryllium copper crinkle washers in both metric sizes. These washers have good corrosion resistance, are non-magnetic, and have high resistance to permanent set under compression. They have a number of uses including use as vibration-proof locking washers that will not mark or damage panel surfaces."
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