Circuits

Circuit guides

Each guide explains one circuit, what to watch for, and opens it in the app so you can poke the inputs.

01Arithmetic

EasyHalf AdderAdds two 1-bit inputs A and B using an XOR gate for Sum and an AND gate for Carry. MediumFull AdderAdds three 1-bit inputs (A, B, and Carry-In Cin) using two cascaded XOR stages and carry-lookahead AND/OR gates. Hard4-Bit ALUComputes 4-bit A + B, A - B, A AND B, or A OR B selected by a 2-bit Opcode feeding a 4-to-1 Multiplexer.

02Plexers

Medium2-to-1 MultiplexerRoutes one of 2^S data inputs to the output based on the Select line: Y = (~S · D0) + (S · D1).

03Sequential

MediumJ-K Flip-FlopStores one bit and changes it only on a rising clock edge: J sets, K resets, and J = K = 1 toggles.

04Combinational

Medium3-Input Majority Voter (K-Map Minimal SOP)Outputs 1 when at least two of (A, B, C) are 1. Minimized via Karnaugh Map to Y = A·B + B·C + A·C. EasyBus Contention / Short-Circuit DiagnosticDemonstrates how connecting two opposing gate outputs directly onto one wire causes a red Error (E) state that the AI Signal Prover can diagnose.

05Displays

Medium4-Bit Counter & Hex Digit DisplayDrives a 7-segment Hex Digit Display from a 4-bit Synchronous Counter and Clock source.