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Fundamentals of Electric Circuits - Port City International University
Fundamentals of Electric Circuits - Port City International University

EH Small Stone Phaser Issue J
EH Small Stone Phaser Issue J

wiring diagrams and tech notes
wiring diagrams and tech notes

POCSAG RADIO PAGER LX2 plus / LX2 advanced LX4
POCSAG RADIO PAGER LX2 plus / LX2 advanced LX4

Question Bank on Networks - Prof. Ch. Ganapathy Reddy
Question Bank on Networks - Prof. Ch. Ganapathy Reddy

Catalog Section KILOVAC High Voltage Relays
Catalog Section KILOVAC High Voltage Relays

SCHAUM`S OUTLINE OF THEORY AND PROBLEMS of BASIC
SCHAUM`S OUTLINE OF THEORY AND PROBLEMS of BASIC

ENGINEERING CIRCUIT ANALYSIS
ENGINEERING CIRCUIT ANALYSIS

B. TADS Population Outage Definitions
B. TADS Population Outage Definitions

EMI Suppression with Ferrites
EMI Suppression with Ferrites

Lessons in AC Circuits
Lessons in AC Circuits

... produce voltages alternating in polarity, reversing positive and negative over time. Either as a voltage switching polarity or as a current switching direction back and forth, this “kind” of electricity is known as Alternating Current (AC): Figure 1.1 Whereas the familiar battery symbol is used as a ...
Book 2 AC
Book 2 AC

Circuit Protection Devices
Circuit Protection Devices

Stray insensitive switched capacitor composite operational amplifiers
Stray insensitive switched capacitor composite operational amplifiers

Chapter 14 Capacitance (E)
Chapter 14 Capacitance (E)

... Physics beyond 2000 Chapter 14 Capacitance ...
Circuit Analysis Demystified - one step easy a wonderful site
Circuit Analysis Demystified - one step easy a wonderful site

... components. This means that each component has two connection points or terminals that can be used to connect it with other components in the circuit. Each type of component will have its own symbol. This is illustrated in Fig. 1-1, where we indicate the terminals with two rounded ends or dots and u ...
Circuit Analysis Demystified
Circuit Analysis Demystified

ADVAC Model 03 Medium Voltage Vacuum Power Circuit
ADVAC Model 03 Medium Voltage Vacuum Power Circuit

... 1. Align breaker and ramp, dolly or lift truck with circuit breaker compartment 2. Pull handles (10) to center (this withdraws Cell Interlock Tabs (11) allowing breaker to be inserted) 3. Push breaker into breaker compartment with handles. Interlocks may restrict insertion. (Ref. Interlocks) 4. Alig ...
Electronic Circuits for the Hobbyist, by VA3AVR
Electronic Circuits for the Hobbyist, by VA3AVR

OVERVIEW IGNITION INSPECTION DISTRIBUTOR ALIGNMENT
OVERVIEW IGNITION INSPECTION DISTRIBUTOR ALIGNMENT

2 The Junction Diode 3
2 The Junction Diode 3

... where K is a constant, T is the absolute temperature, VG is the semiconductor bandgap voltage, and VT is the thermal voltage. The constant K is directly proportional to the cross-sectional area of the junction. Because the diode current is proportional to IS , it follows that the current is also pro ...
SF6 Circuit breaker up to 17.5 kV
SF6 Circuit breaker up to 17.5 kV

Lessons In Electric Circuits, Volume VI -- Experiments
Lessons In Electric Circuits, Volume VI -- Experiments

R.. Series Contactors R1400, R1700, R2100
R.. Series Contactors R1400, R1700, R2100

... R.. series contactors, and variants described in this catalogue, are used for controlling motors, and generally for controlling power circuits, up to 500/1000 V a.c. or 600/1000/1500 V d.c. The R.. series contactors can be used, and adapted, for many industrial applications with high performances an ...
Iza_MSthesis - Electrical and Computer Engineering
Iza_MSthesis - Electrical and Computer Engineering

1 2 3 4 5 ... 81 >

Crystal radio



A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of copper wire for adjustment, a capacitor, a crystal detector, and earphones. They are distinct from ordinary radios as they are passive receivers, while other radios use a separate source of electric power such as a battery or the mains power to amplify the weak radio signal so as to make it louder. Thus, crystal sets produce rather weak sound and must be listened to with sensitive earphones, and can only receive stations within a limited range.The rectifying property of crystals was discovered in 1874 by Karl Ferdinand Braun, and crystal detectors were developed and applied to radio receivers in 1904 by Jagadish Chandra Bose, G. W. Pickard and others.Crystal radios were the first widely used type of radio receiver, and the main type used during the wireless telegraphy era. Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment medium around 1920.After about 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes (Audions), and became obsolete for commercial use. They, however, continued to be built by hobbyists, youth groups, and the Boy Scouts as a way of learning about the technology of radio. Today they are still sold as educational devices, and there are groups of enthusiasts devoted to their construction who hold competitions comparing the performance of their home-built designs.Crystal radios receive amplitude modulated (AM) signals, and can be designed to receive almost any radio frequency band, but most receive the AM broadcast band. A few receive shortwave bands, but strong signals are required. The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.
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