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Circuit Legend


Wire
Wire - An efficient path for current.
Wire No Join
Wires with no join - The preferred method is the hump method as the other can be confused more easily.
Wire Join
Wires with join - Indicates a physical connection that allows current to pass through.
Power DC
Power DC - Unlimited supply of electrical energy with the current always flowing in one direction.
Power AC
Power AC - Unlimited supply of electrical energy with the current constantly changing direction.
Battery
Battery - Limited supply of electrical energy from or more cells.
Cell
Cell - Limited supply of electrical energy.
Ground
Ground - Connections to earth, 0 Volts or the real ground depending on the circuit.
Diode
Diode - Restricts current to flow in one direction only.
LED
LED - Converts electrical energy to light.
Photodiode
Photodiode - A photo(light) sensitive device that restricts current to flow in one direction only dependant on light levels.
Zener Diode
Zener Diode - A diode use to maintain fixed voltage across its terminals.
Resistor
Resistor - Used to restrict current flow.
Rheostat
Rheostat - Used to restrict current flow to varying degrees but with only two contacts.
Potentiometer
Potentiometer - Used to restrict current flow to varying degrees but with three contacts.
Preset Resistor
Preset Variable Resistor - Used to restrict current flow to varying degrees but to be set once and left.
Thermistor
Thermistor - Used to restrict current flow to varying degrees depending on temperature it is exposed to.
Light Dependent Resistor
Light Dependent Resistor - Used to restrict current flow to varying degrees depending on the amount of light it is exposed to.
Heater
Heater - Converts electrical energy into heat.
Fuse
Fuse - When current that exceeds the fuses ratings passes through it breaks the circuit. Used for safety
Lamp, Lighting
Lamp, Lighting - Converts electrical energy into light
Lamp, Indicator
Lamp, Indicator - Converts electrical energy into light for the purpose of a warning
Motor
Motor - Converts electrical energy into mechanical energy
Inductor (Coil, Solenoid)
Inductor (Coil, Solenoid) - A coil of wire that creates a magnetic field when current passes through it.
Oscilloscope
Oscilloscope - A meter that displays the shape of electrical signals over time.
Galvanometer
Galvanometer - A meter that displays the very small currents less than 1mA.
Voltmeter
Voltmeter - A meter that displays the voltage difference between two points.
Ohmmeter
Ohmmeter - A meter that displays the current flow between two points.
Ammeter
Ammeter - A meter that displays the resistance between two points.
And
And - A Logic circuit that takes two inputs, if the are both high then output is high, all other cases produce a low. (00=0 01=0 10=0 11=1)
Or
Or - A Logic circuit that takes two inputs, if either or both are high then output is high, all other cases produce a low. (00=0 01=1 10=1 11=1)
NAnd
NAnd - A Logic circuit that takes two inputs and produces the opposite results of AND. (00=1 01=1 10=1 11=0). An interesting note, your computer CPU is built entirely out of the gates.
Nor
Nor - A Logic circuit that takes two inputs and produces the opposite results of OR. (00=1 01=0 10=0 11=0).
Not
Not - A Logic circuit that takes one input, if it is high it output a low and if it is high it outputs a low. (0=1 1=0)
Xor
Xor - A Logic circuit that takes two inputs, if either but not both are high then output is high, all other cases produce a low. (00=0 01=1 10=1 11=0)
NXOr
NXOr - A Logic circuit that takes two inputs and produces the opposite results of XOR. (00=1 01=0 10=0 11=1)
Switch SPST
Switch (SPST) - A switch that allows current to flow only in the close position. Will retain the state once it is changed.
Switch 2 Way SPDT
Switch 2 Way (SPDT) - A switch that allows current to flow between two different paths. Will retain the state once it is changed.
Switch Push
Switch Push - A switch that allows current to flow only in the close position (only when pressed). Will return to the open state.
Switch Push To break
Switch Push to Break - A switch that allows current to flow only in the close position (only when not pressed). Will return to the closed state.
Switch Dual On/Off DPST
Switch Dual On/Off (DPST) - A switch that allows current to flow through from two wires only in closed position. Will retain the state once it is changed.
Switch Reversing DPDT
Switch Reversing (DPDT) - A switch that allows current to flow through from two wires each through two different paths. Will retain the state once it is changed.
Dial
Dial - A switch that allows current to flow to multiple destinations from one source. Will retain the state once it is changed.
Relay
Relay - A switch that is triggered buy an electric current that allows current to flow from one source to two different destinations. Will return to it's original state once the current flow stops. NO-Normally open. NC-Normally Closed COM-Common
Transistor NPN
Transistor NPN - Used as a switch or to amplify current (a small current switches the larger one on).
Transistor PNP
Transistor PNP - Used as a switch or to amplify current (a small current switches the larger one on).
Photo transistor
Photo transistor - Used to amplify current or as a switch, triggered by light.
Capacitor
Capacitor - Stores electrical charge.
Capacitor, Polarised
Capacitor, Polarised - Stores electrical charge but must be place the right way round.
Capacitor, Trimmer
Capacitor, Trimmer - Stores a variable electrical charge to be set once and left.
Capacitor, Variable
Capacitor, Variable - Stores a variable electrical charge to be adjusted constantly.
Piezo Transducer
Piezo Transducer - A transducer that converts electrical energy to sound energy.
Transformer
Transformer - Two sets of coiled wires separated by an iron core with no connection between the wires used to change AC voltages up and down.
Speaker
Speaker - A transducer that converts electrical energy to sound energy.
Earphone
Earphone - A transducer that converts electrical energy to sound energy.
Microphone
Microphone - A transducer that converts sound energy to electrical energy.
Amplifier
Amplifier - A summarized circuit of transistors with one input and one output that increases the input current.
Bell
Bell - A transducer that converts electrical energy to sound energy.
Buzzer
Buzzer - A transducer that converts electrical energy to sound energy.
Antenna
Antenna - Transmits or receives radio signals.
 
 

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