Earphone A transducer which converts electrical energy to sound.
A variable capacitor is used in a radio tuner.
An OR gate can have two or more inputs. The output of an OR gate is true when at least one of its inputs is true.
Transistor NPN A transistor amplifies current and can be used with other components to make an amplifier or switching circuit. This symbol is for a bipolar junction transistor (BJT), the type you are most likely to use at first.
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