How Make an Oscillator (astable Multivibrator) and Pulse Width Regulator (monostable Multivibrator) With Logic Gates

by square1a in Circuits > Electronics

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How Make an Oscillator (astable Multivibrator) and Pulse Width Regulator (monostable Multivibrator) With Logic Gates

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This article provide the circuit diagram and a video demo of:

  1. astable multivibrator (Step 1 - 2)
  2. monostable multivibrator (Step 3 - 4)

Supplies

Information in the brackets indicate the exact supply that I used. You can use alternatives.

  1. 2X NOT gates (on 1X 74HCT04 IC chip)
  2. 1X OR gate (on 1X 74HCT32 IC chip)
  3. 1X capacitor (47 uF)
  4. 3X resistors (1MΩ, 710kΩ, 100kΩ)
  5. 1X LED
  6. Power supply for the logic gates (I just powered them from an I/O board)

Circuit Diagram (astable Multivibrator)

specific astable.PNG

The circuit diagram is the image above.

Testing Astable Multivibrator

Building an oscillator / clock (astable multivibrator) using logic gates on a bread board

Above is the video demo

Circuit Diagram (Monostable Multivibrator)

specfiic monostable.PNG

The circuit diagram is the image above.

Testing Monostable Multivibrator

Building a pulse length regulator (monostable multivibrator) using logic gates on a bread board

Above is the video demo

Bistable Multivibrator

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This article shows examples for monostable and astable multivibrator. This is a third type: Bistable, which is commonly referred to as a flipflop or SR latch (which is shown in the image above). There are plenty of information on flipflops on the web, so this article will not go into bistable multivibrators.


A type of bistable multivibrator is JK flipflops, on which I have an article about:

https://www.instructables.com/How-to-Build-a-Physical-JK-Flip-Flop-master-Slave-/