Simple Dancing Lights (Flexible ASTABLE MULTIVIBRATOR)

This is a β€˜Simple Dancing Lights’ circuit that glows two pair of three LEDs each in an oscillatory mode. The oscillation rate of the circuit can be controlled in various ways. The circuit has 2 potentiometers and two pair of four capacitors that can set the oscillatory frequency – thus slowing down or fastening the lighting of the LEDs. Actually this project is designed for school students who have little knowledge of Multivibrators and want to learn about its functioning. This project can be used to trigger the relays to derive 220V loads (bulbs) in the season of festivals. It is a great school project for the students who wish to impress their teachers.

This little electronic project for kids looks very beautiful when switched on!

Astable Multivibrator

Astable Multivibrator


Flexible Astable Multivibrator is a FREE-RUNNING MULTIVIBRATOR. The LEDs remain ON or OFF at each voltage level for a definite period of time defined by the Potentiometers (Px & Py) and the Capacitors (Cx & Cy). The Astable Multivibrator here is said to oscillate.

This is a very flexible transistor based circuit of an Astable Multivibrator that produces a square wave output that derives LEDs from a pair of grounded emitter cross-coupled BC547 transistors. Both these transistors in my project are NPN and are biased for linear operation and are operated as Common Emitter Amplifiers with 100% positive feedback.

Flexible Astable Multivibrator

Flexible Astable Multivibrator

π—–π—Όπ—Ίπ—½π—Όπ—»π—²π—»π˜π˜€ π—₯π—²π—Ύπ˜‚π—Άπ—Ώπ—²π—±:

  • Transistors 2 x BC547
  • Resistors 2 x 330Ξ©
  • Resistors 2 x 1KΞ©
  • Potentiometers 2 x 47KΞ©
  • 3 x Yellow LEDs
  • 3 x White LEDs
  • Capacitors 2 x 47Β΅F
  • Capacitors 2 x 100Β΅F


  • One Small Plastic Box
  • 9V Battery
  • 9V Battery Connector
  • Small 2inchx 2inch PCB
  • 30cm wires
  • Soldering Iron, Soldering Wire, Wax

Cost of Project: INR 30/- (Including Battery)

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