Elenco Upgrade Kit SC500 to SC750 - Manual (Page 63)

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Project #642
OBJECTIVE: To demonstrate the operations of the NAND gate.
NAND Gate
Project #643
OBJECTIVE: To demonstrate the operations of the OR gate.
OR Gate
The NAND gate works the opposite of the AND as shown in the logic
chart.
In the circuit, the S1 & S2 switches represent inputs A & B, and the D7
display represents output Q.
The basic idea of an OR gate is: If A OR B is 1 (or both are 1), then
Q is 1.
In the circuit, the S1 & S2 switches represent inputs A & B, and the D7
display represents output Q.
A B Q D7
0 0 1 “H”
1 0 1 “H”
0 1 1 “H”
1 1 0 “L”
A B Q D7
0 0 0 “L”
1 0 1 “H”
0 1 1 “H”
1 1 1 “H”
A
B
Q
NAND Gate
A
B
Q
OR Gate