Miscellaneous Symbols

Symbol Component Name Description
Lamp / light bulb Generates light when current flows through
Lamp / light bulb Generates light when current flows through
Lamp / light bulb Generates light when current flows through
Motor Electric motor
Transformer Change AC voltage from high to low or low to high.
Electric bell Rings when activated
Buzzer Produce buzzing sound
Fuse The fuse disconnects when current above threshold. Used to protect circuit from high currents.
Fuse The fuse disconnects when current above threshold. Used to protect circuit from high currents.
Bus Contains several wires. Usually for data / address.
Bus Contains several wires. Usually for data / address.
Bus Contains several wires. Usually for data / address.
Optocoupler / Opto-isolator Optocoupler isolates connection to other board
Loudspeaker
Microphone Converts sound waves to electrical signal
Operational Amplifier Amplify input signal
Schmitt Trigger Operates with hysteresis to reduce noise.
Analog-to-digital converter (ADC) Converts analog signal to digital numbers
Digital-to-Analog converter (DAC) Converts digital numbers to analog signal
Crystal Oscillator Used to generate precise frequency clock signal