Elenco Snap Circuits Motion - Manual (Page 50)

Build the circuit as shown. Tap on the vibration switch (S4) or bang
on the table to make the red/yellow LED (D10) light. The adjustable
resistor (RV2) controls how long the LED stays on for.
If you reverse the orientation of the red/yellow bicolor LED (D10),
then it will produce yellow light instead of red light. You can also
replace the red/yellow LED with the color LED (D8, “+” towards the
pivot stand).
Project 83 Super Vibration Light
Build the circuit as shown. Tap on the vibration switch
(S4) or bang on the table to activate an alarm and
make the red/yellow LED (D10) light.
Variants:
● Change the sound by removing the 1-snap and 2-
snap wires that are at point A, or by moving them
to be across points B & C, or across points A & B.
● Replace the red/yellow LED with a 3-snap wire.
The sound is louder now.
● Reverse the orientation of the red/yellow bicolor
LED (D10); then it produces yellow light instead of
red light.
● Replace the red/yellow LED with the color LED
(D8, “+” on right).
● Replace the speaker (SP2) with a 3-snap wire or
the color LED (D8, “+” on top).
● Replace the 1mF capacitor (C7) with the 100mF
capacitor (C4). Now the alarm stays on for a long time.
Project 85 Vibration Alarms & Lights
Use the preceding circuit
(including any of its variants)
but connect the vibration
switch (S4) using the red &
black jumper wires, as shown.
Nothing happens if you hold S4
steady in your hand. Shaking
S4 activates alarms & lights.
Project 84
Fast
Vibration
Light
Use the preceding circuit but
replace the 100mF capacitor
(C4) with the smaller 1mF
capacitor (C7). The LED still
flashes brightly, but now turns
off quickly. Try removing C7
and see how the LED
brightness is affected.
-49-
This circuit is similar to project 11
(Vibration Light), but uses the 100mF
capacitor (C4) and NPN transistor (Q2) to
filter and amplify the effects of the vibration
switch (S4), to keep the red/yellow LED
(D10) on longer. Try removing C4 and see
how the LED brightness is affected.
Project 86
Shaky
Alarms &
Lights
The adjustable resistor (RV2)
is used here as a fixed resistor
(10kW value), so moving its
lever won’t do anything.
SCM-165_Manual_061114.qxp_Layout 1 7/7/14 11:29 AM Page 50