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.
