The output of a NAND gate is true unless all its inputs are true.Īn OR gate can have two or more inputs. The 'o' on the output means 'not' showing that it is a Not AND gate. The output of an AND gate is true when all its inputs are true.Ī NAND gate can have two or more inputs. A NOT gate is also called an inverter.Īn AND gate can have two or more inputs. The output of a NOT gate is the inverse (opposite) of its input, so the output is true when the input is false. There are two sets of symbols: traditional and IEC (International Electrotechnical Commission).Ī NOT gate can only have one input. Logic gates process signals which represent true (1, high, +Vs, on) or false (0, low, 0V, off).įor more information please see the Logic Gates page.
Presets are cheaper than normal variable resistors so they are often used in projects to reduce the cost. It is designed to be set when the circuit is made and then left without further adjustment. This type of variable resistor (a preset) is operated with a small screwdriver or similar tool. It can be used like this as a transducer converting position (angle of the control spindle) to an electrical signal. This type of variable resistor with 3 contacts (a potentiometer) is usually used to control voltage. Examples include: adjusting lamp brightness, adjusting motor speed, and adjusting the rate of flow of charge into a capacitor in a timing circuit. This type of variable resistor with 2 contacts (a rheostat) is usually used to control current. A resistor is used with a capacitor in a timing circuit. NO = Normally Open, COM = Common, NC = Normally Closed.Ī resistor restricts the flow of current, for example to limit the current passing through an LED. Some DPDT switches have a central off position.Īn electrically operated switch, for example a 9V battery circuit connected to the coil can switch a 230V AC mains circuit. This switch can be wired up as a reversing switch for a motor. Some SPDT switches have a central off position and are described as 'on-off-on'.Ī dual on-off switch which is often used to switch mains electricity because it can isolate both the live and neutral connections. This type of push switch is normally closed (on), it is open (off) only when the button is pressed.Īn on-off switch allows current to flow only when it is in the closed (on) position.Ī 2-way changeover switch directs the flow of current to one of two routes according to its position. This is the switch used to operate a doorbell. It is also known as ground.Ī push switch allows current to flow only when the button is pressed. For many electronic circuits this is the 0V (zero volts) of the power supply, but for mains electricity and some radio circuits it really means the earth. There is no electrical connection between the coils.Ī connection to earth. Energy is transferred between the coils by the magnetic field in the core. Transformers are used to step up (increase) and step down (decrease) AC voltages. Two coils of wire linked by an iron core. A battery is more than one cell.ĭC = Direct Current, always flowing in one direction.ĪC = Alternating Current, continually changing direction.Ī safety device which will 'blow' (melt) if the current flowing through it exceeds a specified value. Snaps to annotation geometries, drawing layout items and drawing frames.A single cell is often wrongly called a battery, but strictly a battery is two or more cells joined together. Snaps to grid lines, reference lines, and the edges of existing objects.ĭimensions and mark lines, drawing layout items and drawing frames Snaps to the nearest points on objects, e.g. Snaps to the line extensions of nearby objects, and reference and geometry lines of drawing objects. Snaps to points on objects that form a perpendicular alignment with another object. Snaps to intersections of lines, polyline segments, arcs, and circles. Snaps to midpoints of lines, polyline segments, and arcs. In a drawing, when you want to snap to the center point of a circle that has been created by using a polygon cut in the model, set the advanced option XS_ADD_SNAPPING_SYMBOL_TO_CIRCLES to TRUE. Snaps to end points of lines, polyline segments, and arcs.
Snaps to points and grid line intersections.
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