Data Sheet

375. Battery Power When Red
Connect points E and F with a 4-wire (4) in project #372. Turn on
the switch (62) and you will hear low volume space battle sounds with
the heart LED (69) and colorful LED (72) ashing. Turn off the switch
(62) and the sounds will go off. Project #38 discussed that Power is
calculated as V*I. In this circuit, when the colorful LED (72) is red the
power drawn from the battery module (91) is 4.5V*60mA = 0.27
Watt.
376. Battery Power when Green & Blue
Connect points G and H with a 4-wire (4) in project #372. Turn on the
switch (62) and you will hear low volume music with the heart LED (69)
and colorful LED (72) ashing. Turn off the switch (62) and the music
will go off. When the colorful LED (72) is green or blue, the power
drawn from the battery module (91) is 4.5V*10mA = 0.045 Watt.
Interesting to note that the batteries drain more quickly with red light
than with blue or green light.
377. AND Gate Revisited
Build the circuit shown on the left. Note that the heart LED (69) only
turns on when both the switch (62) and press switch (61) are on. This
was discussed as an AND Gate logic in project #64. Did you know that
you can buy Integrated Circuits (ICs) that implement AND-gate logic?
Below is a picture of the pinout for one example IC that provides four
AND-gates.
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