Loudspeaker A transducer which converts electrical energy to sound.
Photodiode A light-sensitive diode.
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.
This type of variable capacitor is designed to be set when a circuit is made and then left without further adjustment.
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