Passive Component Circuit Symbols
- circuit symbols or circuit diagram symbols for passive components including capacitors, resistors, and inductors.
There are many different circuit symbols for passive components.
This page provides circuit symbols for passive components including resistors, capacitors, inductors and transformers.
As these circuit diagram symbols for some passive components, particularly resistors vary according to the geographical location where they were generated, those for US and European commonly used versions are given where possible.
The circuit symbols are based on those that appear to be most widely used.
Resistor circuit diagram symbols
The selection of resistor circuit diagram symbols:
|Variable resistor (Europe)|
|Variable resistor (US)|
|Light dependent resistor, LDR|
|Thermistor (temperature dependent resistor)|
Capacitor circuit diagram symbols
The selection of capacitor schematic symbols:
|Capacitor (Fixed non-polar)|
|Variable capacitor (Operator adjustable)|
|Variable capacitor (Preset)|
|Capacitor (Fixed polar Europe)|
|Capacitor (Fixed polar US)|
Inductor circuit diagram symbols
The selection of inductor schematic symbols:
|Inductor with ferrite core|
|Inductor with laminated / iron core|
| Inductor with tap on the coil
(Note: the position of the tap can be moved to indicate approximately where on the coil the tap is positioned).
Transformer circuit diagram symbols
The selection of transformer schematic symbols:
| Transformer with air core
(Note: turns on either side of the transformer may be alterd to indicate step up or step down).
|Transformer with ferrite core|
|Transformer with laminated or iron core|
|Transformer with centre tap|
| Transformer with adjustable core
(Typically used for tuning, e.g. as in IF transformers, etc).
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