The following circuit will oscillate the two LEDs on and off. The pulse rate can be changed by adjusting VR1.
| Part Name | Jameco Part # | Quantity |
| 100µF Electrolytic Capacitor | 29963 | 1 |
| 100K Variable Resistor | 94730 | 1 |
| 1K Resistor (1/4W) | 29663 | 1 |
| 680 Resistor (1/4W) | 31499 | 2 |
| LED (Yellow) | 333606 | 1 |
| LED (Red) | 333526 | 1 |
| NE555 Bipolar Timer | 27422 | 1 |
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