High pass filter low pass. Dpf diesel particulate filter. Water carbon filters
High Pass Filter Low Pass
A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. An example of an analogue electronic band-pass filter is an RLC circuit (a resistor–inductor–capacitor circuit).
Of great vertical extent
greater than normal in degree or intensity or amount; "a high temperature"; "a high price"; "the high point of his career"; "high risks"; "has high hopes"; "the river is high"; "he has a high opinion of himself"
Far above ground, sea level, or another point of reference
(after a measurement and in questions) Measuring a specified distance from top to bottom
a lofty level or position or degree; "summer temperatures reached an all-time high"
at a great altitude; "he climbed high on the ladder"
Of less than average height from top to bottom or to the top from the ground
Located at or near the bottom of something
in a low position; near the ground; "the branches hung low"
Situated not far above the ground, the horizon, or sea level
less than normal in degree or intensity or amount; "low prices"; "the reservoir is low"
an air mass of lower pressure; often brings precipitation; "a low moved in over night bringing sleet and snow"
Public Alley
I have never been good at sleeping. It's just a skill set that I don't have. Lately though, this problem has gotten even worse. So, tonight I decided to walk the nearly 5 miles home from work in an attempt to wear myself out.
Well, this didn't really go as planned and instead of wearing me out, the long walk just made me catalog all these little places that I needed to go back out and photograph.
The lights in this alley were motion activated, but only stayed on for 5 seconds (tops) at a time. This was quite problematic when working with a 30 second exposure so the entire time I'm shooting this I had to jump up and down behind the camera to keep all the lights from going off.
A higher order low-pass filter
This filter will improve the signal received from our home-brew ADS-B antenna. Built on an Arduino Protoboard