Manual

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21. Toy Lights
Build the circuit, press the switch (62), then hold
the press switch (61), the bi-directional LED (71)
will turn on blue. Release the press switch (61),
then install the bi-directional LED (71) in the reverse
direction, hold the press switch (61) the bi-directional
LED (71) will turn on red. Circuits like this are used
in lots of battery operated toys where there is a
main ON-OFF switch, but also other buttons on the
toy that can turn on lights when you press them and
the main switch is ON.
22. Ship-to-Ship Morse Code
Build the circuit, press the switch (62), then hold
the press switch (61), you will hear the alarm (78).
Release the press switch (61), the alarm (78) will
stop. This can be used as a Morse code typing
simulator. Morse code uses various sequences of long
and short on-off tones, lights or clicks to represent
letters, numbers, and text. Since World War II, the
process for sending messages using signal lamps
has barely changed. It requires someone trained in
Morse code to operate the lamp’s shutter by hand,
receiving, decoding, and replying to messages.
Red Light
Blue Light