This circuit can be built with basic components like breadboard-, connecting wires, battery-9V, capacitor, LED 5mm, LED flasher, resistors like 1k, 10k & 4.7K. LED flasher circuit using 2N3904 transistor is shown below. LED Flasher Circuit with 2N3904 NPN Transistor Once the base current is detached then the transistor will be turned off, so this phase is known as the cut-off region & the VBE could be approximately 600 mV. Voltage from the base terminal to the emitter (VBE) is 6V.Continuous Collector current or IC is 200mA.Voltage from collector to the emitter (VCE) is 40V.This transistor is available in To-92 Package The features and specifications of the 2N3904 NPN transistor include the following. Pin3 (Collector): Current supplies throughout this terminal.Pin2 (Base): This pin controls the transistor biasing.Pin1 (Emitter): The flow of current will Drain out throughout this terminal.This transistor includes three terminals which are discussed below. The pin configuration of a 2N3904 NPN transistor is shown below. This 2N3904 NPN transistor is very popular, so it can be used like an amplifier and simple electronic switch so it can handle 200 mA of power & 100 MHz frequency when used it is used as an amplifier. This type of NPN transistor is mainly designed for medium voltage, low power applications and it operates at moderately high speeds. The 2N3904 is a common NPN BJT used in the applications of general-purpose switching or low-power amplifying applications.
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