Before revision: Comparison of pictorial and schematic styles of circuit diagrams thumbnail|250px|Common schematic diagram symbols (US symbols) thumbnail| 250px |The circuit diagram for a four-bit TTL counter, a type of state machine A circuit diagram (wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit.
After revision: Comparison of pictorial and schematic styles of circuit diagrams thumbnail|2350px|Common schematic diagram symbols (US symbols) thumbnail| 250px |The circuit diagram for a four-bit TTL counter, a type of state machine A circuit diagram (wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit.