Signal Generators

Introduction to Signal Generators The function of a signal generator is to produce time a dependent signal with some special characteristics of frequency, amplitude and shape. Sometimes these features are controlled externally throughout control signals.  The voltage-controlled oscillator or VCO is a clear example. To ensure that the signal generator acheives its function, some kind of feedback devices are used. These devices have features that […]

Microwave Oven History

Microwave Oven History

Microwave Oven History The microwave oven was discovered in 1947  by Percy Spencer. Mr. Percy  Spencer, an engineer of the Raytheon Company, was carrying in his jacket pocket a bar of chocolate, which gave origin to one of the most used inventions in everyday life. How the microwave oven was discovered? Mr. Spencer conducted researches with […]

Voltage, Current and Power Gain on an Amplifier

Voltage, Current and Power Gain on an Amplifier Voltage Gain (Δv) The voltage gain is obtained by dividing the output by the input voltage. Δv = Vout / Vin. For example: If an amplifier has an input signal of 0.1 Vpp (peak-peak volts) and has an output signal of 10 Vpp, the voltage gain is: Δv = 10 Vpp / 0.1 Vpp […]

Decibel - Power, Voltage and Current gains

Decibel – Power, Voltage and Current gains

Decibel The decibel expresses a ratio of quantities and not a quantity by itself. it does not express an exact quantity. The decibel expresses how many times more or how many times less, a quantity in relation to another quantity is. It is an expression that is not linear but logarithmic. It is a relative measurement unit. At audio frequencies […]

Electric Current Definition

Electric Current Definition

Electric Current Definition The electric current is a current of electrons that crosses a material. Some conductive materials have free electrons that easily pass from an atom to another. These free electrons, if they move in the same direction as they jump from one atom to another one, become an electric current. To achieve this movement of electrons, […]

Electric Conductors (wire - cables)

Electric Conductors (wire – cables)

Electric Conductors: General characteristics The electric conductors are metal threads (copper or aluminum) that are used to conduct electric current. Electric conductors are used in: – Electric facilities (housing, industry, trade, etc.) – Car electric instalations, and.. – Construction of inductors The most commonly used types of conductors are: wires, cables, conductors with protective cover. Wires Wires are electric conductors made of a single metal thread and […]