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The following table provides the commonly used electrical wiring schematic symbols for Semi Conductors including diodes, capacitors and transistors.
Diode
Diode Reverse Conducting
Diode Reverse Blocking
Zener Diode
Transistor
(PNP)
Transistor (NPN)
Light Emitting Diode (LED)
Capacitor
Bidirectional Triode Thyristor (Triac)
Diac