Intro: Dual LED Flasher
Here is a simple circuit that flashes 2 LEDs alternately. It only uses a few basic components, so why don't you try it!
Step 1: Gather the Parts Needed.
- 2N3904 transistors x2
- 10µf caps x2
- Red LEDs x2
- 470Ω resistors x2
- 100kΩ resistors x2
- Assorted jumpers
- A breadboard
- 9V battery
- 9V battery clip
Step 2: The Schematic Diagram.
Follow the schematic diagram for this circuit.
Step 3: Insert the Transistors and Resistors.
Insert the 2 transistors in your breadboard like the one on the picture. Then, connect the emitters of the 2 transistors to the ground(negative) rail.
Connect the 2 100kΩ resistors to the bases of the transistors and the other end to a free rail.
Connect the 470Ω resistors to the collectors of the transistors and the other end to a free rail.
Step 4: Insert the Caps.
Insert the 2 capacitors as shown in the picture. Put the negative side of the caps on a free rail on the breadboard.
Step 5: Jumpers and LEDs...
Place jumpers as shown and noted in the pictures.
Connect jumpers from the positive rail of breadboard to the 100kΩ resistors.
Step 6: Connect the Battery.
Connect the battery to its respective rails and see if it blinks.
Congratulations, you have made your project!