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What Are Pull-Up and Pull Down Resistors? | Francis Shanahan[.com]
"The pic on the right is the pull down resistor. Same thing but the 10k resistor is between the pin and ground, causing it to “pull down” whilst the switch is open. Once it’s closed the majority of the current flows through the pin vs going to ground hence the pin reads +5V."
Circuit Cellar - The Magazine for Computer Applications
I have a copy of the magazine with this understandable article on impedance matching if you'd like to borrow it (instead of paying $1.5)."Antenna Basics
by Robert Lacoste
Robert recently moved out of his comfort zone and stepped into the world of antenna
Introduction to Filters
"the gain goes to zero, asdoes the output. At w=1/RC, called the break frequency (or cutoff frequency, or 3dB frequency, or half-power frequency, or bandwidth), the magnitude of the gain is 1/sqrt(2)@0.71. In this case (and all first order RC circuits) hi
Impedance of different devices (derivations) - Wikipedia, the free encyclopedia
"or, more simply, through the help of Euler's formula, as Z_\mathrm{capacitor} = \frac{1}{j \omega C}"
Qucs project: Quite Universal Circuit Simulator
It has a current probe! :) "Qucs is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit. After that simulation has
Nabble - Gnucap - Dev - SPICE to gnucap transition
"So, there are certain hacks you just accept .. like the need to put in a voltage source where you want to measure current. That's a hack because spice only lets you view voltages, so you add a subcircuit that has an internal node whose voltage correspond
Open Source Fedora: life without gwave when using gspiceui
Put & after a command to have it run in background and not take over console.
gspiceui&
Antique Radio Classified--Restoration Topics: Capacitor Tips for the Beginner
"Capacitors act to pass AC while blocking DC. Capacitors are used to block, pass, filter and tune the various voltages and signals in your radio."
Comparing supercapacitors compared with batteries
"# Sometimes, capacitors are used to store charge for high-speed use. That's what a flash does. Big lasers use this technique as well to get very bright, instantaneous flashes. # Capacitors can also eliminate ripples. If a line carrying DC voltage has rip
Inductor Basics
"Inductors are used extensively in analog circuits and signal processing. Inductors in conjunction with capacitors and other components form tuned circuits which can emphasize or filter out specific signal frequencies."
Print Free Graph Paper
Use 1/10 inch engineering - Nathan Green. "Save yourself money and a trip to the store! Print graph paper free from your computer. This site is perfect for science and math homework, craft projects and other graph paper needs. All graph paper files are op
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