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In Reply to: RE: Engineering, my man, is an iterative process. posted by clarkjohnsen on June 06, 2008 at 08:33:15
"Always tinker, always modify. Listening, seeing, trying, testing... these are the necessary, hands-on, eyes-on, ears-on steps towards a prototype or a product."
Why do all this if you've nailed everything on the first pass? Sure, first try successes in complex, high tech, devices are not hugely not common but you do believe it is possible don't you?
"You think a device is born whole, from imagination?"
Pretty much. It happens to me all the time for simpler designs. I don't see why this is unimaginable for simple designs.
"All the hot air to which I was referring, never managed to blow the smallest breeze across anyone's ears. It was just a gabble of useless talking. No engineering there!"
You may or may not be right. That remains to be seen.
Follow Ups:
...throw an engineer into convulsions.
(We do have a sense of humor...)
clark
Not a magic quantum device containing pixie dust. We have a description of what it does, Ohm's Law tells us it has to have a significantly lower impedance at RF frequencies than other equipment that's plugged in or it won't work, and high-pass filter slopes are defined mathematically by type and order, regardless of the actual hardware implementation. Nothing mysterious here that I can see, nor does PS Audio claim some new theory of physics is involved. I have this (apparently naive, to some) belief that that's kinda how engineering works.
and found that its encapsulated in RTV. I must have had a dyslexic moment as I remembered the NH in an inverted position, the caps are actually closer to the AC prongs than the coil. You got 4 caps, u47 at 305 volts and it seems that three are on one leg and the other on the other leg although the prongs are not polarized. The choke has a secondary winding upon the core. I can make out a transistor CEN 2N5060. Looks like there is another transistor and a diode and about 4 resisters, but mine is glued i pretty tightly.Stu
Thanks, stu - very helpful. Interesting that it's not polarized w/r/t hot & neutral on the AC line - meaning it's not a CM filter? Presumably the transistor is part of the RC circuit for the LED; the diodes maybe are the rectifier bridge we guessed would be in there to feed the output of the filter to the LED tank circuit. Coil = inductor for the HP filter? Or an HF transformer of some kind. Someone else who knows more than me surely will add more.
doesn't apply to buildings and bridges, does it?
Stu
If I understand your point I think it raises the question of what is the design intent and was it accomplished? If multi use is a design requirement then the final performance will be judged based on that. Your example of buildings and bridges highlights this. If for example a bridge was designed to pass a single truck and then fall down would be considered a success as long as the truck made it across undamaged one time. Sure the bridge is lying in a heap of rubble at the bottom of a canyon but it did it's job perfectly and therefore would be deemed an engineering success since it ultimately accomplished the job it was intended for.
The problem with buildings and bridges is the money necessary to build the perfect one goes up exponentially after a certain level of engineering competence has been achieved. They are concieved and designed as disposable objects replaceable or repairable as the need arises. Why put all your engineering talent into a single bridge when a whole city must be built? For example diamonds might be a little harder and last a little longer as a road surface than asphalt but who in their right mind would build roads out of diamonds. I believe we make choices about minimum and maximum acceptable cost/performance for everything we create nad often quality tradeoffs are made in favor of saving money. This to me doesn't mean we couldn't have designed something better....to me it means we have properly defined what value our finished design will have to us and have scaled the quality appropriately.
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