Elenco LIGHT - Manual (Page 75)

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Project 163 Blow Sound Changer
When you turn on the switch (S1), you hear a siren sound. Blow into
the microphone (X1) to change the sound.
RV is used as a fixed resistor (50k
Ω)
; so moving its control lever will
have no effect.
Short Light Project 165
Shorter
Light
Use the preceding
circuit but replace the
100k
Ω
resistor (R5)
with the smaller 5.1k Ω
resistor (R3). Now the
light doesn’t stay on as
long.
Project 164
Build the circuit, turn on the slide
switch (S1), and push the press
switch (S2). The white LED (D6)
is on for a while and then shuts
off. Turning S1 off and back on
will not get the light back on.
Push S2 to get the light back on.
Replace the white LED with the
color LED (D8) to change the
light style.
RV is used as a fixed resistor
(50k
Ω) ; so moving its control
lever will have no effect.
The light is on while the
100
µ
F capacitor (C4) is
charging, and shuts off when
the capacitor gets fully
charged. Pressing S2
discharges the capacitor. The
charge-up time is set by the
capacitor’s value and
resistors R5 and RV.