Scientech DB31 Decoder/Demultiplexer is a compact, ready to use experiment board for Decoder and Demultiplexer. This board is useful for students to study and understand the operation of 1 to 8 and 1 to 16 Decoder and 8 to 1Demultiplexer and verify its truth table.


Model: Scientech DB31


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 verify the operation of 74LS138 as a 1 to 8 Decoder
  • To verify the operation of 74LS138 as an 8 to 1 Demultiplexer
  • The study of the cascaded connection of two 1 to 8 Decoder to make a 1 to16 Decoder


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


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