"In order to communicate effectively, humans developed languages, signs and writing; however, communicating over long distances has always been a slow process…"
"Some African tribes still use drums to send messages across the savanna."
"On May 24th, 1844, an American artist and inventor called Samuel Morse (1791-1872) sent the first telegraph message from the Supreme Court Chamber of the U.S. Capitol Building in Washington D.C. to a receiver in Baltimore, some 65 km away."
"Thomas Doolittle developed a new process to draw strong copper wire. Because of its better electrical conductivity over iron, copper wires became the standard in telephony."
This course is designed to help you learn about components, circuits, and the use of electronics. You can explore the contents in whatever order you wish.The emphasis is on providing information starting at the 'absolute beginners' level, but we hope eventually to provide material of use to anyone interested in electronics and its applications ...
This section of the Scots Guide deals with Analogue Electronics with a special emphasis on Audio-related topics. There are also some specialist pages on the properties of cables as these relate to audio.
The First Eleven - Basic electronics courses sometimes make it appear as if electronic engineers have an obsession with voltmeters, batteries, and oscilloscopes. That's because it's often convenient to talk about these when presenting a course at a university, college, or wherever. In reality, the physics and electronics of practical systems like Hi-Fi's, TV's, computers, etc, are much more interesting.
The main components used in electronics are of two general types: passive (e.g. resistors and capacitors) and active (e.g. transistors and integrated circuits). The main difference between active and passive components is that active ones require to be powered in some way to make them work. Active components can also be used to amplify signals.
by J. C. G. Lesurf University of St Andrews Astronomy Group, Scotland.
Subcategories include specific engineering disciplines, including Electrical Engineering, Computer Engineering, Mechanical Engineering, and Civil Engineering. Also, some books that are general to all disciplines are listed here.
A DAC converts an abstract finite-precision number (usually a fixed-point binary number) into a physical quantity (e.g., a voltage or a pressure). In particular, DACs are often used to convert finite-precision time series data to a continually varying physical signal.
Analog and Digital Conversion, Automatic Control Engineering, Automotive Systems. Basic Electrical Generation, Basic Electricity, Biography of Nikola Tesla.
Circuit Idea, Circuit Theory, Communication Systems, Control Systems. Digital Circuits, Digital Signal Processing, Electronics, Embedded Control Systems Design
Embedded Systems, Practical Electronics, Power Systems Analysis, Design, and Control Microprocessor Design, Engineering Tables, Semiconductors, SensorNetworks
The Security Guard duty monitor below, shown in eight circuits at Digital Circuits - 1 are examples of logic circuits, i have converted them from the DOS Orcad to Orcad 9 and corrected some errors a few years back.
These circuits can be used for looking at the logic blocks or to learn. This product was built and sold to some firms many years back. Now these designs are best done with a PIC or Atmel chip. Here is the user manual
This circuit was done with CMOS CD40xx type of ICs. A RAM was used to store the Day/Time LED Status.
It was to monitor the Alertness of the Security Guard. Periodically the Unit will Buzz and Flash and the Security Guard has to press a Big Button to indicate he is awake, alert, agile and around the Unit.
All Green means fine, few Red LEDs means the Guard was sleeping or gone away from some times. All Red means Security Guard is missing. :-)
This is a slow scanner as process is slow, that way many analog inputs can be multiplexed and sent into one analog input of a D/A. In near real time systems a faster mux could be used or mux totally avoided. This was made in some numbers, so the pcb is better than others.