Elenco Snap Circuits Motion - Manual (Page 77)

Project 158 Loud Sirens
Build the circuit and turn on the slide switch (S1). You hear a siren.
Variants: You can 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 & D.
Project 159 Adjustable Volume
Sirens
The preceding circuit may be too loud, so modify it to match this one,
which uses the adjustable resistor (RV2) as a volume control. Turn on
the slide switch (S1) and adjust the volume using RV2.
Variants: You can 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 & D.
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