page_title: 2N3904
hierarchical_section_title: 2N3904
caption_attribution_description: English: A joule thief constructed on a breadboard.
context_page_description: The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. It is designed for low current and power, medium voltage, and can operate at moderately high speeds.
context_section_description: The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications.  It is designed for low current and power, medium voltage, and can operate at moderately high speeds.
caption: A 2N3904 in a TO-92 package on a breadboard (lower left)
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