Connect the LEDs and 470Ω ResistorsĬonnect one end of a 470 ohm resistor to the collector of each transistor. Step 1: Insert the Transistors and Wire the Emitters 2. Get the two LEDs and the two 470 ohm resistors ready. Use wire links to connect the emitter of each transistor to the bottom breadboard rail. These can be PN2222, KSP2222, plastic 2N2222 or similar transistors. To start building the dual LED flasher circuit, first insert the two transistors into the breadboard with the flat face pointing down as shown in the photo below. Insert the Transistors into the Breadboard Two LED Flasher Circuit Diagram Build the Dual LED Flasher Circuitįollow the instructions below to build the dual LED flasher circuit on an electronic breadboard. As can be seen in the circuit, it uses two NPN transistors, two LEDs, four resistors and two capacitors. The dual LED flasher circuit diagram, or two LED flasher circuit diagram is shown below. The required parts for the two transistor LED flasher circuit are shown below: Two LED Flasher Circuit Components Dual LED Flasher Circuit Diagram Try using 47uF or 33uF capacitors to speed up the rate at which the LEDs flashĢN2222, BC107, BC108 or BC109 transistors can be used in the circuit, but have a different case to the KSP2222 / 2N2222Īs an Amazon Associate I earn from qualifying purchases: In addition to an electronic breadboard, wire links, a 9V battery and a battery clip, you will need: QtyĤ70 ohm resistors (yellow - violet - brown) PrerequisitesĬomplete tutorial two - Transistor Timer before attempting this tutorial. The video below shows what the dual LED flasher circuit does.
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