DaveE's latest activity

It would be quite unusual for a laser to be converging away from the exit. Normally the beam waist will be near the aperture, and in...

Sorry, I don't have great study advice. But, these basic math subjects (Trig, Calculus) aren't just hurdles to overcome to get an EE...

Yes, most likely. Maybe two if you want 1D collimation.

Mono Lake to Bishop, CA, 65 miles, has lots of geology. A short N-S tour here. https://en.wikipedia.org/wiki/Mono_Lake map and guide...

Thank you!!! How about something like a Platinum badge that's subscription based to remind people (like me) to send more money. It...

That is a false friend because it looks mathematically correct, but is interestingly not related to the physics at hand here. Usually...

If you're an EE then it's definitely the 2nd version. The canonical quadratic form would be ##{(\frac{s}{\omega_o})}^2 +\frac{1}{Q}...

Today I learned of the Laguna Garzon Bridge. https://en.wikipedia.org/wiki/Laguna_Garzón_Bridge. I thought it was so senseless it had...

There are a couple reasons for using the "single pole / single throw" SPST switch and resistor versus a "single pole / double throw"...

Isn't that what grade school is for? Why waste time in uni on the basics? Isn't that what application interviews and entrance exams are...

Hmmm. So a bit of quick math without a schematic. Suppose you want to supply 5 volts out at 30 amps. That's within the spec right? That...

But then what regulates the resistor current? If the voltage applied changes, so does the current. Just semantics, I guess. It works...

I drew the diagram that way, as it fitted the written description. That forms a current regulator, as the resistor current is multiplied...

Very fast rise time switches with (sort of) high power. Most have a β emitter to "pre-ionize" the gas. It's a spark gap, but not a...

Krytrons are exceptionally fast switches. They were originally used as the TR switch in radar systems, where one antenna is used for...