How to measure speed of a tennis ball...
During big tennis tournament there is a large score table reporting speed of a tennis ball.
What type of sensors or radars do they use?
Automatic control of a stage projector ...
My neighbor plays bass guitar in a band. He told me that they had a light effects system that included
a joystick to manually control projectors. There is an operator who's job is to focus the light spot on
a singer while she moves around the stage.
I have been thinking lately what would be the best way to automate that process. Any ideas?
Applying black paint to a heat sink: better or worse?..
Had a discussion recently with a coworker from manufacturing dpt: they apply black paint to increase
performance of a heat sink. I am not sure it's a good idea, because paint provides thermo insulation.
Better road grip with wider tires?..
Most people agree that a car with wider tires has better road grip, but the theory doesn't seem
to explain this? I remember from school that a force of friction depends on surface and weight and has
no relation to the area:
F = kN,
where k - friction coefficient depending on material, N - is a normal fource proportional to the
weight of a car.
What am I missing?
Measure multiple points...
I Would like to get experts opinion on the following problem.
I am taking voltage measurements at multiple points. The data is within 1v...2v range.
Will I get better accuracy if I use the same instrument for all measurements rather than taking
parallel measurements ?
Question to power supply experts...
I need to build a test bench for a chip. The chip has a block that when enabled draws 1.6A
from a supply during 5nS. The problem is that I need to put 20 chips on the test board. Any suggestions?
Granite ball in San Diego...
Last month I took a trip to San Diego, CA. I stopped at the coffee shop
downtown La Jolla.
There was a small fountain right in front
of that shop. Nothing unusual on the first sight.
The fountain is in the shape of a plate. There is a ball on that plate, and water comes from underneath
the ball. When I came closer I noticed that the ball seems to be floating on that plate.
I thought it must had been made from rubber...
I touched it - no, the ball as well as the plate were made from granite.
And again the ball was floating... I am an engineer myself.
My best guess would be that the water pressure keeps that granite ball floating.
Is it so, or is there another trick?
2 outlets in series?
Hi, can I connect two 110v outlets in series to double the voltage?
burnin board problem...
I run reliability tests in burnin chamber. My board is populated with over 20 semiconductor
parts switching at full rail. The switching generates over and under shoots which, I think, may affect the life time
of the parts. What is the best way to handle this? Also people use different terms, such as "ringing",
"overshoots", "spikes" - are we talking about the same effect?
Do you know how much you are worth on the market?
If you stayed with the same company
for a lengthy period of time, there is a big chance you are under-earning.