14
Although this circuit seems simple,
inverters or NOT gates are very
important in digital logic circuits.
Same or “NOT”
Build the circuit shown. Notice that when the press switch (S2) is
pressed, the LED (D1) goes off. This is an example of an inverter
circuit, or NOT gate. Whenever the input is high (switch is on), the
output is low (LED is off) and whenever the input is low (switch is off)
the output is high (LED is on). Disassemble the circuit when nished to
avoid draining your batteries.
Two-way Light Switch
Build the circuit on the left. Note that two of the 2-snaps are left
unconnected on one end because they will be used as switches in this
project. If you connect the free ends of each of these 2-snaps both to
the “high bar” or positions B in the gure or both to the “low bar” or
positions A in the gure, the LED (D1) lights up. But if you connect the
free end of one of the 2-snaps to the “high bar” and the free end of the
other 2-snap to the “low bar”, then the LED does not light up.
Project 91
Project 92
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