Elenco Circuit Maker Skill Builder 125 - Manual (Page 42)

Project #79 Same or “NOT”
Although this circuit seems simple,
inverters or NOT gates are very
important in digital logic circuits.
Project #78 Alien Alarm
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Build the circuit shown on the left and turn on the slide switch (S1).
Press and hold the press switch (S2) to make the lamp (L1) brighter.
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 finished to
avoid draining your batteries.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 42