User Manual

Project 122
Water-
Human-Drawn
Machine Gun
Use any of the projects 119-121 circuits, but add
a connection between the points marked B & C
using a 1-snap and a 2-snap. Now it sounds like
a machine gun.
Project 123
Water-Human-
Drawn Fire
Engine
Use any of the projects 119-121 circuits, but
remove the connection between B & C, and add
a connection between A & B. Now it sounds like
a fire engine.
Project 124
Water-Human-
Drawn
European Siren
Use any of the projects 119-121 circuits, but
remove the connection between A & B, and add
a connection between A & D. Now it sounds like
a European siren.
Turn on the slide switch (S1).
The yellow LED (D10) and
some LEDs on the disco
motor (DM) light. The disco
motor shaft will not spin.
YELLOW
Project 126
Red & More
Use the preceding circuit, but reverse the yellow
LED (D10) or replace it with the red LED (D1),
“+” on the right.
Use the project 125 circuit, but replace the
yellow LED (D10) with the green LED (D2), “+”
is on the right.
-49-
Project 127
Green & More
Project 125 Yellow & More
The green LED (D2) takes more voltage to turn
on than yellow or red, leaving less voltage for
the LEDs on the disco motor, making them
dimmer.
Electric current flows from the batteries, through the yellow
LED, divides among the LEDs on the disco motor, then
flows through the slide switch and back to the batteries.
On the disco motor, the red LED is brightest because it
needs less voltage to turn on than the green & blue LEDs.
The blue LED is dimmest (or off) because it needs more
voltage to turn on than red or green.