Manual

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25. Three-person Rocket Launch
Build the circuit to the left. In this circuit, pretend the
LED (69) is a rocket. To launch the rocket the switch
(62) must be ON, AND the press switch (61) must
be ON, AND the reed switch (83) must be turned
ON with the magnet (7). Systems like this are used
to prevent accidental rocket launching by having the
switches placed far enough apart that it requires
three people to turn them on simultaneously.
26. Triple Input ‘AND’ Gate
Build the circuit on the left, turn the switch (62)
ON, press and hold the press switch (61) to turn
it ON, and move the magnet (7) towards the reed
switch (83). Only when all three switches (INPUTS)
are ON (True) will the lamp (OUTPUT) be ON (True).
Electronic AND Gates can have two or more inputs
but the function is still the same. All inputs must be
True (ON) for the output to be True (ON).