Looked like an interesting book and within my budget. Thanks to both of you!
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John Curl
Is this the same John Curl as we know from amplifier designs ?
Hans
Is this the same John Curl as we know from amplifier designs ?
Hans
NO, not even close.
Stein
Is this the same John Curl as we know from amplifier designs ?
No, but JC did study ballet.
Two short sentences:
1. We don’t so much hear distortion levels as distortion mechanisms.
2. You need to understand the [distortion] mechanism before you can design a test that will quantify it sensibly.
True or false? Is in one true and the other false? Please explain...
1. We don’t so much hear distortion levels as distortion mechanisms.
2. You need to understand the [distortion] mechanism before you can design a test that will quantify it sensibly.
True or false? Is in one true and the other false? Please explain...
Concern
An inductor with significant resistance can overheat, and if a conjugate circuit directly across an amp fails the impedance may drop to near 1 ohm. You won't necessarily know or hear it until it's too late (smoke/fire)...
Your customers have asked about this..
I've attached a plot of potential dissipation for a 50W amp, and the low impedance that will arise if this 18mH(3.2ohm) inductor was to short after becoming hot.. (simple saturation of the core would also reduce the impedance).



An inductor with significant resistance can overheat, and if a conjugate circuit directly across an amp fails the impedance may drop to near 1 ohm. You won't necessarily know or hear it until it's too late (smoke/fire)...
Your customers have asked about this..
R2 is the only resistor marked with a minimum of 10watts. So I would assume that there is a lot of power going trough L4.
So now to the question. Is it beneficial to get a low ohm L4 coil?
Would there be any detriment in switching to the smaller Jantzen 4mh and 18mH inductors if I already have the Erse SuperQ inductors? Wanting to put the crossover below the speakers and will be tight on space.
I've attached a plot of potential dissipation for a 50W amp, and the low impedance that will arise if this 18mH(3.2ohm) inductor was to short after becoming hot.. (simple saturation of the core would also reduce the impedance).



Inductor heat calculations for conjugate (L4)
You replied
According to the Transformer And Inductor Design Handbook (Figure 6-4), the allowable dissipation is preferrably no more than 2W and up to 5W.
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You replied
Mass plays a role in the short term. Device dissipation depends on the ability of heat to escape, which is partly dependent on surface area.The copper will absorb a lot of energy as it has thermal mass which also means it will heat up much more slowly than the resistor.
The inductor will dissipate around 75% more than the resistor in this circuit. Even by your own estimate here it needs to be able to deal with 17.5W. It has a surface area of around 70cm2.1R8 10W Resistors
According to the Transformer And Inductor Design Handbook (Figure 6-4), the allowable dissipation is preferrably no more than 2W and up to 5W.
.....
Attachments
I did not know that I had 'customers' and hence I suspect a loaded question would follow.
I am not taking the bait.
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I am not taking the bait.
.
I'm confident the man got a clause written on a piece of paper stored in his back pocket saying "I'm not responsible for anything I have ever expressed in my whole life, in particular anything remotely related to audio."
ps. where does those quotes come from, hyperlink is missing.
ps. where does those quotes come from, hyperlink is missing.
Two short sentences:
1. We don’t so much hear distortion levels as distortion mechanisms.
2. You need to understand the [distortion] mechanism before you can design a test that will quantify it sensibly.
True or false? Is in one true and the other false? Please explain...
Pure trolling.
//
If not, I would have asked.
"We don’t so much smell fart levels as fart (digestion?) mechanisms."
"You need to understand the fart before you can design a test that will quantify it sensibly.
"Is in one...."
Awful handling of the queens language to boot.
Also very poor idea to design a tailored measurement system from what you think you are about to measure as it will probably skew your readings. All in that post is so corny that it must be trolling. It cant be a sincere addition to this fine forum. It just can not.
//
"We don’t so much smell fart levels as fart (digestion?) mechanisms."
"You need to understand the fart before you can design a test that will quantify it sensibly.
"Is in one...."
Awful handling of the queens language to boot.
Also very poor idea to design a tailored measurement system from what you think you are about to measure as it will probably skew your readings. All in that post is so corny that it must be trolling. It cant be a sincere addition to this fine forum. It just can not.
//
You don't understand the concept?
Do three wrongs plus the one I'm making right now make a right? Sure as heck read as someone kicking a hornets nest hoping to stir up more pontification.
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