The following photo shows the completed dual LED flasher circuit. Finally connect the red positive lead of the 9V battery clip to the top horizontal breadboard rail. Connect the black negative lead of the 9V battery clip to the bottom horizontal breadboard rail. Power up the dual LED flasher circuit using a 9V battery. The completed circuit is shown in the image below. Use wire links to connect the base (middle pin) of each transistor to the negative lead of each opposite capacitor. Connect the negative lead of each capacitor to its corresponding 22k resistor.
Insert the capacitors with the positive lead of each capacitor on the collector of its corresponding transistor. Step 3: Insert the 22kΩ Resistors and Wire to Top Rail 4. Connect the top lead of each 22k resistor to the top rail of the breadboard using a wire link, as shown in the photo below. Connect the two 22k ResistorsĬonnect the two 22k resistors across the middle channel of the breadboard. Step 2: Insert LEDs and 470Ω Resistors 3. Get the two 22k ohm resistors and two wire links ready. Connect the cathode of each LED to its corresponding 470 ohm resistor. To do this, connect the anode of each LED to the top rail of the breadboard. Connect the other end of the resistor to a tie point on the other side of the breadboard middle insulating channel, as shown in the photo below.Ĭonnect an LED to each resistor as shown below. 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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