DaveE's latest activity
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DaveE replied to the thread Obnoxious advertisements here.Thank you!!! How about something like a Platinum badge that's subscription based to remind people (like me) to send more money. It... -
DaveE reacted to Cthugha's post in the thread Undergrad Different Definitions of The Quality Factor with
Like.
That is a false friend because it looks mathematically correct, but is interestingly not related to the physics at hand here. Usually... -
DaveE replied to the thread Undergrad Different Definitions of The Quality Factor.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}...
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Today I learned of the Laguna Garzon Bridge. https://en.wikipedia.org/wiki/Laguna_Garzón_Bridge. I thought it was so senseless it had...
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DaveE reacted to berkeman's post in the thread I'm trying to intuit how pull-up and pull-down resistors work with Like.
There are a couple reasons for using the "single pole / single throw" SPST switch and resistor versus a "single pole / double throw"...
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DaveE reacted to DaveC426913's post in the thread Why do we spend so little time learning grammar in college? with Like.
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...
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DaveE reacted to Averagesupernova's post in the thread High School Analog power supply output question with Like.
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...
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DaveE replied to the thread High School Analog power supply output question.But then what regulates the resistor current? If the voltage applied changes, so does the current. Just semantics, I guess. It works...
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DaveE reacted to Baluncore's post in the thread High School Analog power supply output question with
Skeptical.
I drew the diagram that way, as it fitted the written description. That forms a current regulator, as the resistor current is multiplied... -
DaveE replied to the thread Krytrons... again! :0).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...
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Krytrons are exceptionally fast switches. They were originally used as the TR switch in radar systems, where one antenna is used for...
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DaveE reacted to berkeman's post in the thread High School Analog power supply output question with Like.
This thread is now on a short leash.
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DaveE replied to the thread High School Analog power supply output question.I doubt you can build a reliable power supply without documentation like schematics. I've also done several of this sort of design and...
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DaveE reacted to Baluncore's post in the thread High School Analog power supply output question with Like.
I have been working with linear supplies for more than 50 years. I know what I am doing. Post your circuit diagram and I will show you...
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DaveE reacted to berkeman's post in the thread NASA Currently trying to build a rocket to launch into space with Like.
Welcome to PF. Your Profile shows that you are in the UK, so I did a Google search on amateur rocketry clubs in the UK and got lots of...
