Elenco Electronics 202 - Manual (Page 99)

-98-
Project #233
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 (L2) with the motor (M1,
positive “+” side up), be sure to put on the
fan. Turn on the slide switch (S1) 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 #236
Delayed
Bedside Fan
OBJECTIVE: To build a fan that
stays on for a while.
Project #235 Watch Light
OBJECTIVE: To build a lamp that
stays on for a while.
Turn on the slide switch (S1) and
press the press switch (S2). The
lamp (L2) 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 (B1).
Replace one battery holder (B1) with a 3-snap
and replace the lamp (L2) with the motor
(M1), be sure to put on the fan. Turn on the
slide switch (S1) 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).
Turn on the slide switch (S1) and
press the press switch (S2). The
lamp (L2) stays on for a few seconds
after you release the press switch.
You can change the delay time with
the adjustable resistor (RV).
Project #234
Adjustable Time
Delay Fan (II)
Adjustable
Time Delay
Lamp (II)
!
WARNING: Moving parts. Do not
touch the fan or motor during operation.
!
WARNING: Moving parts. Do not
touch the fan or motor during operation.