The small Christmas LED flasher circuit is small and easy and cheaper than this circuit. It suitable for beginner.
How it works
In Figure 1 is the Schematic diagram of this project. First the LED display section, there are IC1- CD4093 as main, inside IC have4 sets of the same integrated circuit. In circuit will be separated as IC1/1, IC1/2, IC1/3, IC1/4 each section of IC will works with more resistors and capacitors. To signal generator to make the LEDs flash.
-IC1/1 worked with C1, R1 and C2 to make the LED2 and LED3 flashes.
-IC1/2 worked with C3, R2 and C4 to make the LED4 and LED5 flashes.
-IC1/3 worked with C5, R3 and C6 to make the LED6 and LED7 flashes.
-IC1/4 worked with C7, R4 and C8 to make the LED8 and LED9 flashes.
The LED1 flashes for the timing of the IC.
The second, in sound section, we use melody generator IC2-UM66 is IC packages, inside will have audio recording music. Which we can choose the music for many songs as you likes as table 1. For the prototype, use number UM66T01L / S, which is a Christmas song fit.
The IC will has 3 lead, As follows:
– V+ is the power supply lead , has R9 to limit current
– the ground lead to negative battery.
– output lead to the piezo speaker to emit the music sound.
How to builds
This project we use PCB layout as Figure 2 and assemble all parts as Figure 3 the components layout
The parts you will need.
IC1: CD4093__schmitt trigger nand gate
IC2: UM66T___Melody generator
C1, C3, C5, C7: 0.1uF 50V___Ceramic capacitors
C2,C4,C6,C8,C9: 22uF 16V___Electrolytic capacitors
LED1-LED9: LED as you need
PZ1: Piezo speaker
B1: 1.5Vx4 battery = 6V supply.
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