Electronic Symbol Drafting Guide
Contents. Standards for symbols The graphic symbols used for electrical components in circuit diagrams are covered by national and international standards, in particular:. 60617 (also known as BS 3939). Y32.2-1975 (also known as IEEE Std 315-1975 or CSA Z99-1975). Std 91/91a: graphic symbols for logic functions (used in digital electronics).
It is referenced in ANSI Y32.2/IEEE Std 315. Australian Standard AS 1102. (Withdrawn without replacement) Symbols usage is sometimes unique to engineering disciplines and national or local variations to international standards exist. For example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics. Gallery of common electronic symbols Symbols shown are typical examples, not a complete list.
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Traces.
Electrical Symbols & Electronic Symbols Electrical symbols and electronic circuit symbols are used for drawing schematic diagram. The symbols represent electrical and electronic components. Table of Electrical Symbols Symbol Component name Meaning Wire Symbols Conductor of electrical current Connected crossing Wires are not connected Switch Symbols and Relay Symbols Disconnects current when open Selects between two connections Pushbutton Switch (N.O) Momentary switch - normally open Pushbutton Switch (N.C) Momentary switch - normally closed DIP switch is used for onboard configuration Relay open / close connection by an electromagnet Close connection by jumper insertion on pins. Solder to close connection Ground Symbols Used for zero potential reference and electrical shock protection. Connected to the chassis of the circuit Resistor Symbols (IEEE) Resistor reduces the current flow. (IEC) (IEEE) Adjustable resistor - has 3 terminals. (IEC) (IEEE) Adjustable resistor - has 2 terminals.
(IEC) Trimmer Resistor Preset resistor Thermistor Thermal resistor - change resistance when temperature changes Photoresistor / Light dependent resistor (LDR) Photo-resistor - change resistance with light intensity change Capacitor Symbols Capacitor is used to store electric charge. It acts as short circuit with AC and open circuit with DC. Adjustable capacitance Inductor / Coil Symbols Coil / solenoid that generates magnetic field Includes iron Power Supply Symbols Generates constant voltage Generates constant current.
AC Voltage Source AC voltage source Electrical voltage is generated by mechanical rotation of the generator Generates constant voltage Generates constant voltage Generates voltage as a function of voltage or current of other circuit element. Generates current as a function of voltage or current of other circuit element. Meter Symbols Measures voltage.
Has very high resistance. Connected in parallel.
Measures electric current. Has near zero resistance. Six kingdom student activity guide answer key.
Connected serially. Measures resistance Measures electric power Lamp / Light Bulb Symbols / light bulb Generates light when current flows through Lamp / light bulb Lamp / light bulb Diode / LED Symbols Diode allows current flow in one direction only - left (anode) to right (cathode). Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage Schottky diode is a diode with low voltage drop Variable capacitance diode LED emits light when current flows through Photodiode allows current flow when exposed to light Transistor Symbols Allows current flow when high potential at base (middle) Allows current flow when low potential at base (middle) Made from 2 bipolar transistors. Has total gain of the product of each gain.
N-channel field effect transistor P-channel field effect transistor N-channel MOSFET transistor P-channel MOSFET transistor Misc. Symbols Electric motor Change AC voltage from high to low or low to high. Electric bell Rings when activated Produce buzzing sound The fuse disconnects when current above threshold. Used to protect circuit from high currents.
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Contains several wires. Usually for data / address. Optocoupler isolates connection to other board Converts electrical signal to sound waves Converts sound waves to electrical signal Amplify input signal Operates with hysteresis to reduce noise. Converts analog signal to digital numbers Converts digital numbers to analog signal Used to generate precise frequency clock signal Antenna Symbols Transmits & receives radio waves Two wires simple antenna Logic Gates Symbols ) Outputs 1 when input is 0 Outputs 1 when both inputs are 1. Outputs 0 when both inputs are 1.
(NOT + AND) Outputs 1 when any input is 1. Outputs 0 when any input is 1. (NOT + OR) Outputs 1 when inputs are different.
Electrical Drafting Symbols
(Exclusive OR) Stores one bit of data 2 to 1 Connects the output to selected input line. 4 to 1 1 to 4 Connects selected output to the input line. See also.