Macavity

A personal thing that occurs to me when I see a "slideshow" talk of DSOs etc.,
by an expert imager is to wonder about the *actual size* of these objects? ?

Can they be seen by casual observer? Can Amateur scopes SEE this thing?
I began my "Video Astronomy" talks with a discussion of *magnitudes*.  A
basic intro to the idea of Logarithmic scales... The visual magnitude limit.
The (rather positive) ability of technology to see things in the real world? ?

They might end up a tad disappointed in the long run, but that's science! ?

1 minute ago, Gina said:

Class D uses switching at a high frequency to avoid the voltage drop on the output MOSFETs
similar to how a switching power supply works. 

I finally understand now! (Long years of "wondering about such things" are now resolved)

16 hours ago, Gina said:

If I decide to try a chimney sub-woofer I think this Class D sub-woofer amplifier looks a good option. 

Recalling days when folks used to build (tuned) *fireplace* chimney Horns?!

I have to admit I have never understood how anything beyond "Class B"
(push-pull) can successfully reproduce a *whole* audio SINE wave, but... 

Have fun with the Organ Music! If you haven't already bought/considered 
it: Widor's Toccatta and Fugue in F  should "Blow the dust out" of things!