Elenco Circuit Maker Sound Plus 200 - Manual (Page 24)

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Project #32
Build the circuit shown. Notice that if you turn on the slide switch (S1)
OR press the press switch (S2) the LED (D1) lights up. There is no
partially lit state here, the diode is either totally on or totally off. While
this may seem very simple and boring, it represents an important
concept in electronics. Two switches like this may be used to turn on a
light in your house, or they might be two sensors at a railroad crossing
used to start the ding-ding sound and lower the gate. You could also
have more than two switches and the circuit would function the same
way.
This OR That
Project #33
Build the circuit shown. Notice that if you turn on the slide switch (S1)
AND press the press switch (S2) the LED (D1) lights up. Once again,
there is no partially lit state here, the LED is either totally on or totally
off. Two switches like this may be used to turn on the same light in your
house, the room switch and the master switch in the electrical box. You
could also have more than two switches and the circuit would function
the same way.
This AND That
Combinations of AND and OR circuits are used
to add and multiply numbers together in modern
computers. These circuits are made of tiny
transistors in massive integrated circuits.
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:04 PM Page 24