Monostable Multivibrator

Monostable Multivibrator

Scientech DB28 Monostable Multivibrator is a compact, ready to use experiment board for Monostable Multivibrator. This board is useful for  students to study and understand the operation of 74121 NonRetriggerable Monoshot and 74123 Retriggerable Monoshot  Multivibrator and verify its truth table.


Model: Scientech DB28


Scientech Digital Electronics Experiment Boards are designed as a comprehensive Modular solution for beginners to explore the fundamentals of a variety of basic building blocks in Digital Electronics. The boards are very user friendly and support self learning through flexibility of making circuit connections. Logic diagrams on the boards provide easy understating of the concepts. Test points are provided to observe the waveforms/ signals and to measure voltages at different nodes. The boards can be used as standalone unit with external DC Power Supply and logic data switches, or can be used with Scientech Digital Labs; Scientech 2611/Scientech 2614. These labs have built in DC Power Supplies, Pulse Generator, Pulser Switches, Data Switches, Logic Probe, Digital Display, TTL/CMOS Mode Selector, and LED Display.


  • On board test points to observe signals
  • On board Logic diagram
  • Flexibility of making circuit connections
  • Light weight & compact
  • Online Product Tutorial

Scope of Learning

To draw the transfer characteristics of a TTL inverter of 74LSxx series and evaluate 

  • Study of the operation of IC 74LS121 as a NonRetriggerable Monostable Multivibrator and also verify the timing relationship
  • Study of the operation of IC 74LS123 as a Retriggerable Monostable Multivibrator and also verify the timing relationship


  • AD-01 DC Power Supply (±12V, ± 5V)
  • Simtel Digital Electronics Software


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