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/diy/ - Do It Yourself

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>> No.2041854 [View]
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2041854

>>2041660
>200lm/W
That's like 30-35% of the maximum possible efficiency of any light source imaginable. And ~70% of the maximum possible efficiency for a blackbody-style spectrum, as opposed to a monochromic 555nm source.
Are you measuring it somehow, or just quoting the datasheet?

>>2041808
>parasitics
Every single component imaginable has parasitic capacitance and inductance. Usually it's pretty small at low frequencies and DC, but at higher frequencies it becomes an issue. A capacitor will have some inductance in the legs, an inductor will have some capacitance between the windings, and a resistor will have both. Transistors and diodes and such also have them. In general, the better a component is at doing what it's designed for (high capacitance, high inductance, high drain-source current, etc.) the higher its parasitic elements. As with all things, its a compromise.
I think the other thing is meant to be ESR, which is equivalent series resistance. A ceramic capacitor will have a very low ESR, meaning you can pull much higher instantaneous currents from it, compared to an electrolytic. Inductors naturally have ESR due to the resistance of their windings, this can be as low as a few ohms and as high as hundreds or maybe even thousands, in the case of transformers with lots of windings. Thicker inductor wire means less room for turns but less resistive losses, this is a straight 1:1 compromise meaning any given size and geometry of inductor+core will have a fixed magnetic field per watt regardless of what gauge of wire you wind it with. Assuming you don't change what metal you're winding it with.

>>2041844
I bought a Prusa knockoff 2nd hand. Shipping is a bitch. Don't do what I did unless you want a really cheap printer.
Meant to say >>3dpg (picrel) but we'll see if it posts properly this time.
I've been here for 5 years or so, haven't really contributed properly until the last 2 or 3.

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