Christmas Decoration Project

This project flashes 18 LEDs at three different rates and you can use these to create a Christmas decoration of your choice. The circuit is kept simple (and cheap!) by using the 4060B IC which is a counter and oscillator (clock) in one package. The circuit requires a 9V supply, such as a PP3 battery. It will not work with lower voltages and a higher voltage will destroy the LEDs.

The preset variable resistor can be used to adjust the oscillator frequency and this determines the flash rate of the LEDs. The IC limits the current to and from its outputs so the LEDs can be safely connected without resistors in series to limit the current. The stripboard part of the circuit is easy to build but the wiring for the LEDs needs care so detailed instructions are provided below.

Download this schematic diagram.

Parts Required

• resistors: 10k, 470k
• preset: 47k (this could be 100k if necessary)
• capacitor: 0.1µF
• 4060B IC
• 16-pin DIL socket for IC
• LEDs × 18, 5mm diameter, any mix of colours: red, orange, amber, yellow or green
• on/off switch
• battery clip for 9V PP3
• stripboard 13 rows × 18 holes

Download list datasheet semiconductor parts. (PDF Format)

1. CD4060B