Textbook - Vol. III - Semiconductors - Chapter 9 - Practical Analog Semiconductor Circuits
(a) Crystal radio. (b) Modulated RF at antenna. (c) Rectified RF at diode cathode, without C2 filter capacitor. (d) Demodualted audio to headphones. An antenna ground system, tank circuit, peak detector, and headphones are the the main components of a crystal radio. See Figure above (a). The antenna absorbs transimtted radio signals (b) which flow to ground via the other components. The combination of C1 and L1 comprise a resonant
Inductance, Reactance, and Admittance Calculator
This calculator gives the reactance and admittance of an inductor or the inductance given the reactance of an inductor
Antenna Downtilt and Coverage Calculator
This calculator will determine the correct antenna downtilt angle given the heights of the antennas and distance between them.
Electrical Noise and Interference
Worksheets - AC Electric Circuits
Define what noise means, in the electrical sense of the word. How does electrical noise compare and contrast with audible noise?
Free Space Path Loss Calculator
This calculator computes for the free space path loss between transmit and receive antennas.
Worksheets - Discrete Semiconductor Devices and Circuits
A modern method of electrical power control involves inserting a fast-operating switch in-line with an electrical load, to switch power on and off to it very rapidly over time. Usually, a solid-state device such as a transistor is used: This circuit has been greatly simplified from that of a real, pulse-control power circuit. Just the transistor is shown (and not the “pulse” circuit which is needed to command it to
Op Amp Applications - Active Filters
Ok we're continuing our discussion of operational amplifier applications and we're going to be looking at the subject of active filters. Active filters could be differentiated from what we would call a passive filter. A passive filter is a filter that is going to be a filter that is based on resistors, capacitors, inductors, and there will be … no … a passive filter doesn't have any voltage or any amplification whereas
Parallel Wire Inductance Calculator
This tool is designed to calculate the inductance of two parallel wires
Optical Data Communication
Textbook - Vol. IV - Digital - Chapter 14 - Digital Communication
A modern alternative to sending (binary) digital information via electric voltage signals is to use optical (light) signals. Electrical signals from digital circuits (high/low voltages) may be converted into discrete optical signals (light or no light) with LEDs or solid-state lasers. Likewise, light signals can be translated back into electrical form through the use of photodiodes or phototransistors for introduction into the inputs of gate circuits. Transmitting digital information
Tank Circuit Resonance Calculator
This calculator computes the resonant frequency of a tank circuit
Impedance Matching With Transformers
Worksheets - AC Electric Circuits
Suppose you were to take a 3 kW electric heater rated for 240 VAC and connect it to a 120 VAC power source. How much power would it dissipate when connected to a voltage source equal to half its rating?
Skin Depth Calculator
A tool designed to calculate skin depth based on the conductive material being used and the frequency of the signal.
Waveguide Calculator (Rectangular)
This tool calculates the cutoff frequency of a rectangular waveguide
Capacitance, Reactance, and Admittance Calculator
A calculator for solving the capacitance, reactance, and admittance of a capacitor.
Textbook - Vol. I - Direct Current (DC) - Chapter 14 - Magnetism and Electromagnetism
The discovery of the relationship between magnetism and electricity was, like so many other scientific discoveries, stumbled upon almost by accident. The Danish physicist Hans Christian Oersted was lecturing one day in 1820 on the possibility of electricity and magnetism being related to one another, and in the process demonstrated it conclusively by experiment in front of his whole class! By passing an electric current through a metal wire suspended above
Textbook - Vol. II - Alternating Current (AC) - Chapter 8 - Filters
There are applications where a particular band, or spread, or frequencies need to be filtered from a wider range of mixed signals. Filter circuits can be designed to accomplish this task by combining the properties of low-pass and high-pass into a single filter. The result is called a band-pass filter. Creating a bandpass filter from a low-pass and high-pass filter can be illustrated using block diagrams: (Figure below) System level
Wavelength (TEM) Calculator
This calculator determines the wavelength of a signal given the frequency and dielectric constant.
Band Theory of Solids
Textbook - Vol. III - Semiconductors - Chapter 2 - Solid-state Device Theory
Quantum physics describes the states of electrons in an atom according to the four-fold scheme of quantum numbers. The quantum numbers describe the allowable states electrons may assume in an atom. To use the analogy of an amphitheater, quantum numbers describe how many rows and seats are available. Individual electrons may be described by the combination of quantum numbers, like a spectator in an amphitheater assigned to a particular row
Reflection Attenuator Calculator
This tool is designed to calculate the value of resistance R1 in a reflection attenuator.
Simple Parallel (Tank Circuit) Resonance
Textbook - Vol. II - Alternating Current (AC) - Chapter 6 - Resonance
A condition of resonance will be experienced in a tank circuit (Figure below) when the reactances of the capacitor and inductor are equal to each other. Because inductive reactance increases with increasing frequency and capacitive reactance decreases with increasing frequency, there will only be one frequency where these two reactances will be equal. Simple parallel resonant circuit (tank circuit). In the above circuit, we have a 10 µF capacitor and a 100