Astable multivibrator using 555. Circuit and explanation.

Package includes :

  • PCB
  • 555 timer IC
  • 10 Micro Farad capacitor
  • 0.01 Micro Farad capacitor
  • 10K resistor
  • 1K resistor
  • 1M POT
  • LED

Assemble the circuit as shown below. Leave POT1 and R2 unconnected. POT1 is parallel to R1 and POT2 is parallel to R2. Only one from each set need to be connected.

Circuit diagram of astable multivibrator using 555 timer is given below.

Detailed explanation of the circuit, calculation and timing diagram is given here. It is better to provide the voltage supply from a stabilized voltage source. Purchase the following two DIY modules to create a 555 based astable multivibrator from a stabilized voltage source.

Power supply for the 555 based astable multivibrator DIY board is given from the output side of 7805 based voltage regulator. Connections are done as shown in the following diagram. Red line indicate the positive terminal and black line indicates the negative terminal.

After completing the circuit, vary the potentiometer to change the ON time and OFF time of output waveform. Speed of LED blinking will vary with the value of potentiometer. Now, connect the output terminals of astable multivibrator DIY board to Digital Storage Oscilloscope to see the output in real time.

Watch the following video to get the complete demonstration.

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