This 5-color LED flasher circuit might be constructed utilizing the favored 555 timer and 4017 decade counter ICs. It doesn’t require any costly parts like a microcontroller.
The timer IC is used as an astable multivibrator to generate a clock pulse, which is fed to the clock enter of the 4017. Outputs of the 4017 are related to bases of 5 transistors to drive 20 LEDs of various colours, every with its current-limiting resistor.
The 4017 advances to the subsequent output each time it receives a clock pulse, inflicting the LEDs to activate and off in sequence. The pace of the flashing might be adjusted by altering the values of the resistors and capacitors within the 555 timer circuit. The writer’s prototype is proven in Fig. 1.
The circuit diagram of the 5-color flasher is proven in Fig. 2. The circuit contains a 12V battery (or 12V adaptor), timer IC 555 (IC1), decade counter IC 4017 (IC2), 5 BC548 transistors (T1 by T5), 5 units of 5mm purple, inexperienced, blue, white, and yellow LEDs every, and some different parts.
In case you have constructed 555 timer-related tasks, you’d be aware of the IC. The timer IC’s pin 4 (reset) and pin 8 (Vcc) are related to the voltage provide, which might be wherever between 9V and 12V.
On this circuit, a 10k resistor (R1) is related between Vcc and discharge pin 7 of IC1. A 1k resistor (R2) is related between pin 7 and the junction of pin 2 (set off) and pin 6 (threshold).
A 10µF capacitor is related between pin 6 and the bottom pin of the 555 timer, whose floor pin 1 (GND) is related to the circuit’s floor. A 100nF capacitor is related between pin 5 (CV) of the timer and the bottom. The IC’s out pin 3 is related to clock pin 14 of IC4017 (IC2).
Pin 16 of the last decade counter IC2 is related to the availability. Its pins 8 (VSS), 13 (CKEN), and pin 15 (Reset) are related to the bottom. The opposite pins of IC 4017 are outputs used to drive the LEDs for flashing.