Recent content by DaveE

Great! What happened to the tree then?

Imagine that you are measuring the wave height at some arbitrary position on the x-axis. As the waves move towards you, which wave peak arrives first? Also note that the x=0 location is arbitrary. That wave has no beginning, it comes from x → -∞ and goes to x → +∞

Typo in line 4. That wave is moving at the speed of light.

Don't assume that EEs know much about this subject. It's a broad field and most don't ever deal with power distribution. Even if they know some of the theory, it's the actual practice that matters. Grounding can be a complex subject and different jurisdictions may have different approaches. The...

Other engineer's designs aren't always the best. They may have been ignorant, or more likely they had constraints that aren't applicable in your case. It makes sense to investigate a bit, but at some point you need to choose for yourself. I've done pieces of designs that looked kind of stupid...

I guess you could try summing the currents from the parallel pzts into a low input impedance amp. But pzts are high impedance devices, I don't think you'll get much current signal to work with.

I wonder why you care about a combination. Yes, one amp can work. But, as others have said, 3 are better. They aren't that fancy, just op-amps really. You'll have minimal extra cost/size and more flexibility to optimize things.

It should work if you wire them in series. I wouldn't worry too much about impedance matching since your sound waves will (I think) be low frequency compared to your wiring lengths. Use a high input impedance amplifier.

google, dude. My first search result... https://en.wikipedia.org/wiki/History_of_AC_power_plugs_and_sockets

Multiphoton imaging is a well established tool. Here's a review for GI docs, for example. https://pmc.ncbi.nlm.nih.gov/articles/PMC3218135/ If you can use this to reach higher excited states I'm sure you could ionize an atom too. But I don't see why you would want to. Just use a shorter...

Yes. Also, people (like me) often are assuming linearity, which isn't always true.

Yes, sometimes. We need to be a bit nimble to select basis and reference frames to make simple calculations as well as further understanding. The common theme is that some basis are easy to understand and some are easy to calculate. Caveat emptor. I would add that my previous reference to the...

There are lots of materials you might run across that naturally have non-orthogonal basis to describe anisotropic behavior like strength or optical properties. Crystals (Quartz, Calcite, etc.) very often have a crystal structure that isn't orthogonal. The mathematical solutions to many real...

This appears quite often in engineering. We use eigenvalues and eigenvectors to model dynamic systems to make the analysis easier do and understand. Read a little bit about what these are (you'll study them for real later, I think). These vectors are usually not orthogonal, but the way we want...

Since it's a town house, you might try asking your neighbors if they have one too and what it does.