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1. Part of Made in India,
Design Innovation
Workshop,2015
A
Fresh
New
Experience
in
Project-­‐Making
and
Learning

2. PHYSICSINVESTIGATORY
PROJECTON
DARLINGTONPAIR

3. Do
you
know
how
a
high
current
gain
is
achieved
at
a
low
frequency
and
how
the
touch
and
light
sensors
work?
The
concept
of
Darlington
pair
will
make
you
understand
its
working.
In
a
touch
sensor,
there
are
two
electrodes
that
act
as
switches
and
when
they
are
open,
no
current
flows
through
the
circuit.
However,
if
you
put
your
fingers
across
the
two
electrodes,
your
body
closes
the
circuit.
Since
your
body
offers
a
very
high
resistance
to
the
circuit,
the
input
current
through
it
is
very
small.
We
install
a
Darlington
pair,
which
amplifies
this
current
twice
(usually
1,00,000
Rmes)
thereby
making
the
LED
glow
much
brighter.
In
this
project,
a
Darlington
pair
circuit
is
made
using
two
transistors
(Q1
and
Q2),
two
resistors,
an
LED
and
a
few
connecRng
wires.
Q1
and
Q2
are
connected
in
such
a
way
that
the
current
amplified
by
Q1
is
further
amplified
by
Q2
i.e.,
the
collectors
of
both
the
transistors
are
connected
to
each
other
and
the
emiVer
of
Q1
is
connected
to
the
base
of
Q2.
It
was
observed
that
the
LED
glows
brighter
in
dual-­‐stage
amplificaRon
as
compared
to
single-­‐stage
amplificaRon.
Eventually,
base
current
and
collector
current
analysis
was
done
which
was
followed
by
the
verificaRon
of
the
amplificaRon
factor.

4. Have
a
look
at
our
Project
Kit!
CoolJunk
is
India's
fastest
growing
DIY
(do-­‐it-­‐yourself)
kits
company
focused
on
project-­‐based
learning
in
science,
engineering
and
technology.
Having
20,000
users
in
India,
US,
Singapore,
Middle
East
and
New
Zealand,
the
CoolJunk
kits
are
known
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quality,
innovaRon
and
high
producRon
value.
CoolJunk
has
been
featured
in
naRonal
and
internaRonal
journals
including
Wallstreet,
Yourstory,
Hindu
Business
Line,
NextBigWhat
and
was
tagged
as
the
coolest
Indian
start-­‐up
in
IAN
Bootcamp-­‐2011.
For
more
projects
visit
our
website:
CoolJunk
Tools
and
Components
in
one
box.
Step
by
step
visual
instrucRons
Detailed
experiment
theory
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