Elenco Projects 102-305 - Manual (Page 74)

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Project #302
OBJECTIVE: To build a lamp that
stays on for a while.
OBJECTIVE: To build a fan that
stays on for a while.
Replace the lamp (L1) with the motor (M1,
positive (+) side up), be sure to put on the
fan. Turn on the switch and press the press
switch (S2). The fan stays on for a while after
you release the press switch. This could
have a longer delay and be near your bed, to
turn off after you fall asleep.
Project #305
Delayed
Bedside Fan
OBJECTIVE: To build a fan that
stays on for a while.
Project #304 Watch Light
OBJECTIVE: To build a lamp that
stays on for a while.
Turn on the switch and press the
press switch (S2). The lamp stays on
for a few seconds after you release
the press switch.
A miniature version of a circuit like
this might be in your wristwatch -
when you press a light button on the
watch to read the time in the dark, a
light comes on but automatically
turns off after a few seconds to avoid
draining the battery.
Replace the lamp (L1) with the motor (M1),
be sure to put on the fan. Turn on the switch
and press the press switch (S2). The fan
stays on for a while after you release the
press switch. You can change the delay time
with the adjustable resistor (RV).
Be sure to use the 2.5V lamp (L1) for
this circuit. Turn on the switch and
press the press switch (S2). The
lamp stays on for a few seconds after
you release the press switch. You
can change the delay time with the
adjustable resistor (RV).
Project #303
Adjustable Time
Delay Fan (II)
Adjustable
Time Delay
Lamp (II)
!
WARNING: Moving parts. Do not
touch the fan or motor during
operation. Do not lean over the motor.
!
WARNING: Moving parts. Do not
touch the fan or motor during
operation. Do not lean over the motor.