Tutorials & guides

Worked tutorials and guides for wiring, simulating and debugging circuits in LogicBench. Each tutorial includes the theory, the numbers worked out, what you should see, and what to check if it doesn’t work.

Tutorials

Jun 15, 2026 · 7 min read

How to Simulate a 555 Timer in Astable Mode (with the Maths Worked Out)

Wire a 555 astable oscillator with 10 kΩ, 47 kΩ and 10 µF, work out its frequency and duty cycle by hand, then check it in the simulation. Pin map, circuit file and the mistakes that stop it oscillating.

Jun 18, 2026 · 8 min read

How to Build a Half Adder and Full Adder with 74-Series Gates

Derive the half adder and full adder from their truth tables, build them from 7486, 7408 and 7432 gates and verify all eight input combinations. Includes a half adder circuit file you can open in LogicBench.

Jun 19, 2026 · 6 min read

How to Simulate the Arduino Blink Sketch, Including the LED Resistor Maths

Wire an LED to an Arduino Uno in LogicBench, work out the resistor, run the Blink sketch with Serial output and see what changes when you edit the delays, reverse the LED or leave the resistor out.

Oct 27, 2026 · 8 min read

Basic Logic Gates Lab: Verify AND, OR and NOT with the 7408, 7432 and 7404

Verify the truth tables of AND, OR and NOT gates with the 7408, 7432 and 7404 ICs. Pin diagram, wiring steps and a circuit you can open in a simulator.

Oct 27, 2026 · 8 min read

Half Adder Using AND, OR and NOT Gates: Circuit, Truth Table and Wiring

Build a half adder without an XOR chip: SUM = AB' + A'B from 7404, 7408 and 7432 ICs. Circuit diagram, truth table, pin connections and a circuit file.

Oct 27, 2026 · 7 min read

3-Input AND Gate and 3-Input XOR Gate Using 2-Input Gates (7408, 7404, 7486)

Make a 3-input AND gate with green and red indicators, and a 3-input XOR gate (a parity checker), from 2-input 7408 and 7486 gates. Truth table and wiring.

Oct 27, 2026 · 8 min read

Full Adder Circuit with 7486, 7408 and 7432: Truth Table and Pin-by-Pin Wiring

Build a full adder from two XOR gates, two AND gates and an OR gate (7486, 7408, 7432). Truth table, Boolean equations, circuit diagram and pin-by-pin wiring.

Oct 27, 2026 · 10 min read

K-Map Simplification Example: Simplify Two 3-Variable Functions and Build the Circuit

Simplify F = Σm(2,3,7) and G = Σm(4,5,7) on Karnaugh maps, count the gates saved, build both circuits with 7404, 7408 and 7432 and check the truth table.

Oct 27, 2026 · 10 min read

2-Bit Magnitude Comparator: Truth Table, Equations and Logic Circuit

Compare two 2-bit numbers with =, < and > outputs. Textbook Boolean equations, 16-row truth table, gate-level circuit with pin numbers and a circuit file.

Oct 27, 2026 · 12 min read

1101 Sequence Detector Using D Flip-Flops: State Diagram, State Table and Circuit

Design an overlapping 1101 sequence detector (Mealy) with two D flip-flops: state diagram, state table, equations, 7474 wiring, timing diagram and test streams.

Guides