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8
About Your Snap Circuits
®
LIGHT Parts
TRANSISTORS
The phototransistor (Q4) is a transistor that
uses light to control electric current.
Phototransistor (Q4)
ELECTRONIC MODULES
(+)
NC
OUT
(–)
CTL
Connections:
(+) - power from batteries
(–) - power return to batteries
OUT - output connection
CTL - strobe speed control
NC - not used
See project 31 for example of
proper connections.
Connections:
R - red color control
G - green color control
B - blue color control
(+) - power from batteries
INP - circuit input
FB - feedback connection
(–) - power return to batteries
IN - audio input jack
OUT - audio output jack
See projects 5, 6, 12, and 83 for
examples of proper connections.
The
color organ (U22) contains resistors, capacitors,
transistors, a tri-color LED, and integrated circuits. The
LED in it can change colors by direct control, or in synch
with an audio input signal. A schematic for it is available
at www.elenco.com/faqs/
B
(+)
FB
INP(–)
G
R
OUT
IN
The
strobe IC (U23) contains resistors, capacitors, and
transistors that are needed to make a strobe light circuit.
A schematic for it is available at www.elenco.com/faqs/
Infrared module (U24)
OTHER PARTS
Prismatic film separates light into
different colors. The red, green, & blue
lters lter out colors.
The disc holder and discs produce amazing effects when
used with the Strobe Effects circuit (project 31).
The Infrared module (U24) is a miniaturized
infrared receiver circuit for remote control.
The PNP & NPN transistors (Q1 & Q2) are
components that use a small electric current
to control a large current, and are used in
switching, amplier, and buffering applications.
They are easy to miniaturize, and are the main
building blocks of integrated circuits including
the microprocessor and memory circuits in
computers.
PNP & NPN Transistors (Q1 & Q2)
The LED attachments can be used with
any of the LEDs (red, white, color, and
the color organ) to enhance the light
effects.
The fiber optic cable carries light
between two places. The light can be
encoded to transmit information. The
clear and black holders are used to
attach it to circuits.
Fiber Optic Tree
Light
Tower
Egg
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