44. Magnet-controlled Alarm and
LED
Build the circuit, move the magnet (7)
towards the reed switch (83), the alarm
(78) will start in a low volume while the LED
(69) turns on. If you move the magnet (7)
away, the alarm (78) and LED (69) will turn
off.
45. Switch-controlled Bi-
directional LED & Alarm
Series Connection
Build the circuit, press the switch (62), the
alarm (78) will sound, the bi-directional LED
(71) turns on red. Install the bi-directional
LED (71) in the reverse direction, then
press the switch (62), the bi-directional LED
(71) will turn on blue and the alarm will
sound very faintly.
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