User Manual

Turn on the slide switch (S1). Press buttons on the selector
(S8); the disco motor (DM) may spin slowly, and its LEDs may
light Then push the press switch (S2); the disco motor spins
faster and its LEDs are brighter.
Note that the 5-snap wire is under the disco motor
(DM), partially hidden. Place one of the disco covers
on the disco motor shaft. Turn on the slide switch
(S1), then push the any button on the selector (S8).
The disco motor spins and its LEDs light.
The buttons in the selector (S8) have more
electrical resistance than the button in the
press switch (S2), and the disco motor
needs a lot of power to operate, so the
selector buttons cannot make the disco
motor work as well as the S2 button can.
The selector needs help to control the disco
motor - see the next project for the solution.
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Project 145
Selector with
Disco Ball?
Project 146
Selector with Disco
Ball - NPN
The selector (S8) may not be able
to properly control the disco motor
directly, so this circuit uses the NPN
transistor (Q2) to help. A small
electric current flowing into the
transistor through the selector
controls a larger current flowing into
the transistor through the disco
motor.
Disco Cover
SUPPORT BAR
Disco Cover
SUPPORT BAR