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Download Schematic-Symbols-Page-1.Pdf SCHEMATIC COMPONENT LINE / PACKAGE SYMBOL / COMPONENT DEFINITION OR APPLICATION TYPE / SUB-TYPE DRAWING REF DES A device used in electrical circuits to maintain a constant relation between current flow and voltage. Resistors are used to step up or lower the voltage at Resistor different points in a circuit and to transform a current signal into a voltage signal or vice versa, among other uses. The electrical behavior of a resistor obeys Ohm's law for a constant resistance; however, some resistors are sensitive to heat, light, or other variables. Variable resistors, or rheostats, have a resistance that may be varied across a Variable certain range, usually by means of a mechanical device that alters the position of one terminal of the resistor along a strip of resistant material. The Resistor length of the intervening material determines the resistance. Mechanical variable resistors are also called potentiometers, and are used in the volume knobs of audio equipment and in many other devices. a device with three terminals, two of which are connected to a resistance wire and the third to a brush moving along the wire, so that a variable Potentiometer potential can be tapped off: used in electronic circuits, esp as a volume control Sometimes shortened to pot Potentiometer. Manually adjustable, variable, electrical resistor. It has a resistance element that is attached to the circuit by three contacts, or terminals. The ends of the resistance element are attached to two input voltage conductors of the Trimmer Pot circuit, and the third contact, attached to the output of the circuit, is usually a movable terminal that slides across the resistance element, effectively dividing it into two resistors. An electrical device consisting of two conducting plates separated by an ### nF electrical insulator (the dielectric), designed to hold an electric charge. Capacitor Charge builds up when a voltage is applied across the plates, creating an electric field between them. Current can flow through a capacitor only as the voltage across it is changing, not when it is constant. Capacitors are used in power supplies, amplifiers, signal processors, oscillators, and logic gates. ### nF An electrolytic, tantalum or Aluminum, capacitor in which the dielectric film Polarized is formed adjacent to only one metal electrode; the impedance to the flow of current is then greater in one direction than in the other. Capacitor A capacitor whose capacitance can be varied continuously by moving one set ### nF of metal plates with respect to another. The physics principle being the Variable capacitance varies with both the surface area of the plates and how far they Capacitor are from each other. Trimmer capacitors are used mainly to effect the alignment of resonant oscillatory circuits. As a rule, the capacitance of a trimmer capacitor is set Trimmer during the circuit test process. After such setting, the movable parts of the Capacitor trimmer capacitor are locked in place and remain in their fixed positions while the device is operating. A trimmer capacitor is generally a simplified parallel-plate variable capacitor with one stator plate and one rotor plate. An inductor is a passive electrical component that can store energy in a magnetic field created by the electric current passing through it. An inductor Fixed is measured by its inductance, in units of henries. Typically, an inductor is a Inductor conducting wire shaped as a coil; the loops help to create a strong magnetic field. Due to the time-varying magnetic field inside the coil, a voltage is induced that opposes the change in current that created it. A variable inductor can be constructed by making one of the terminals of the device a sliding spring contact that can move along the surface of the coil, Variable increasing or decreasing the number of turns of the coil included in the Inductor circuit. An alternative construction method is to use a moveable magnetic core, which can be slid in or out of the coil. Moving the core farther into the coil increases the permeability, increasing the inductance. A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. A Transformer varying current in the first or primary winding creates a varying magnetic flux in the transformer's core and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF), or "voltage", in the secondary winding. SCHEMATIC COMPONENT LINE / PACKAGE SYMBOL / COMPONENT DEFINITION OR APPLICATION TYPE / SUB-TYPE DRAWING REF DES An electrical device with two active terminals, an anode and a cathode, through which current passes more easily in one direction (from anode to Diode cathode) than in the reverse direction. Diodes have many uses, including conversion of AC power to DC power, and the decoding of audio-frequency signals from radio signals. A Schottky diode is a special type of diode with a very low forward-voltage drop. When current flows through a diode there is a small voltage drop across Schokkey the diode terminals. A normal silicon diode has a voltage drop between 0.6– Diode 1.7 volts, while a Schottky diode voltage drop is between approximately 0.15– 0.45 volts. This lower voltage drop can provide higher switching speed and better system efficiency. Zener diodes are widely used as voltage references and as shunt regulators to ## V regulate the voltage across small circuits. When connected in parallel with a Zener Diode variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. From that point on, the relatively low impedance of the diode keeps the voltage across the diode at that value. A tunnel diode or Esaki diode is a type of semiconductor diode which is capable of very fast operation, well into the microwave frequency region, by Tunnel using quantum mechanical effects. Diode Diode for alternating current', is a diode that conducts current only after its breakdown voltage has been reached momentarily. When this occurs, diode Diac enters the region of negative dynamic resistance, leading to a decrease in the voltage drop across the diode and, usually, a sharp increase in current through the diode. The diode remains "in conduction" until the current through it drops below a value characteristic for the device, called the holding current. From Triode for Alternating Current, is a electronic component which can conduct current in either direction when it is triggered (turned on), and is Triac formally called a bidirectional triode thyristor or bilateral triode thyristor. It is approximately equivalent to two complementary unilateral thyristors joined in antiparallel (paralleled but with the polarity reversed) and with their gates connected together. a varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode which has a variable capacitance that is Varactor a function of the voltage impressed on its terminals. Diode A PIN diode is a diode with a wide, lightly doped 'near' intrinsic semiconductor region between a p-type semiconductor and an n-type semiconductor region. It is typically heavily doped because they are used for ohmic contacts.The wide Pin Diode intrinsic region makes the PIN diode an inferior rectifier (one typical function of a diode), but it makes the PIN diode suitable for attenuators, fast switches, photo detectors, and high voltage power electronics applications. When a light-emitting diode is forward biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the Light Emitting form of photons. This effect is called electroluminescence and the color of the Diode light (corresponding to the energy of the photon) is determined by the energy gap of the semiconductor. An LED is often small in area (less than 1 mm2), and integrated optical components may be used to shape its radiation pattern. A photodiode is a type of photo detector capable of converting light into either current or voltage, depending upon the mode of operation. Photodiodes are Photodiode similar to regular semiconductor diodes except that they may be either exposed (to detect vacuum UV or X-rays) or packaged with a window or optical fiber connection to allow light to reach the sensitive part of the device. A diode bridge is an arrangement of four (or more) diodes in a bridge configuration that provides the same polarity of output for either polarity of Diode Bridge AC AC input. When used in its most common application, for conversion of an alternating current (AC) input into direct current a (DC) output, it is known as a bridge rectifier. SCHEMATIC COMPONENT LINE / PACKAGE SYMBOL / COMPONENT DEFINITION OR APPLICATION TYPE / SUB-TYPE DRAWING REF DES A transient voltage suppression (TVS) diode is an electronic component used to protect sensitive electronics from voltage spikes induced on connected wires. Transorb It is also commonly referred to as a transorb. A transient voltage suppression diode may be either unidirectional or bidirectional. A Gunn diode, also known as a transferred electron device (TED), is a form of diode used in high-frequency electronics. In the Gunn diode, three regions Gunn exist: two of them are heavily N-doped on each terminal, with a thin layer of Diode lightly doped material in between. When a voltage is applied to the device, the electrical gradient will be largest across the thin middle layer. A silicon-controlled rectifier (or semiconductor-controlled rectifier) is a four- Silicon layer solid state device that controls current. In the normal "off" state, the G device restricts current to the leakage current. When the gate-to-cathode Controlled A K voltage exceeds a certain threshold, the device turns "on" and conducts Rectifier current.
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