LCD-LED DisplayLights and Display Board Circuits

Dancing light Schematic Circuit Diagram

Presented here is a straightforward dancing light circuit utilizing the NE555 (IC1) and CD4017 (IC2). IC1 is configured as an astable multivibrator, providing the necessary clock pulses for CD4017. With each clock pulse received at the clock input (pin 14) of IC CD4017, the outputs Q0 to Q9 (as indicated in the CD4017 pin diagram) sequentially go high one by one. The LEDs connected to these pins illuminate in a corresponding manner, creating a captivating dancing effect. The speed at which the LEDs dance is contingent upon the frequency of the clock pulses generated by IC1.

Circuit diagram with Parts list

Dancing light Schematic Circuit Diagram

This circuit’s operation is based on the charging and discharging of capacitors C1 and C2. A current flows from the positive terminal of the battery through resistor R1, passing through the first set of LEDs (D1-D3) and reaching the collector of transistor T1. R1 serves the crucial role of limiting the current flowing through the LEDs to protect them. During this process, capacitor C2 begins charging due to the current flowing through R1.

To discharge capacitor C2, transistor T2, along with resistor R4, is engaged. T2 is activated by receiving a base current. As T2 conducts, it allows a current to flow through T1, causing the second set of LEDs (D4-D6) to illuminate. Subsequently, capacitor C2 starts recharging, initiating the cycle once more.

Notes.

  • Assemble the circuit on a good quality PCB or common board.
  • The ICs must be mounted on holders.
  • The speed of the dancing LEDs can be adjusted by varying POT R2.
  • The capacitor C1 must be rated at 15V.
  • Using different color LEDs could produce a better visual effect.

CD 4017 Pin configuration

Dancing light Schematic Circuit Diagram 2

The NE555, SA555, and SE555 monolithic timing circuits are robust controllers renowned for their stability, effectively generating precise time delays or oscillations. In the time delay mode, precise timing is achieved through the utilization of an external resistor and capacitor. When configured as an oscillator for dependable operation, the free-running frequency and duty cycle are both meticulously regulated using two external resistors and a single capacitor.

This circuit can be triggered and reset in response to falling waveforms, and its output structure has the capability to source or sink up to 200 mA of current.

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