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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
ORGATEUSINGTRANSISTORS

3. What
happens
when
in
an
industrial
plant,
one
or
more
parameters
exceed
the
safe
value?
In
this
case,
the
OR
gate
comes
to
the
aid
and
can
be
used
to
detect
any
parameter
value
(that
of
pressure
or
temperature)
going
above
the
threshold.
Consequently,
the
output
of
the
OR
gate
sends
a
command
signal
for
the
system
to
take
required
acMon.
A
2-­‐input
OR
gate
has
two
inputs
(A
and
B)
and
only
one
output
(Q).
In
this
project,
you
will
make
an
OR
gate
logic
circuit
using
two
transistors
(Q1
and
Q2),
four
resistors,
an
LED
and
a
few
connecMng
wires.
The
emiTer
of
Q1
is
connected
to
the
emiTer
of
Q2.
Similarly,
the
collectors
of
the
two
transistors
are
connected
to
each
other.
Two
wires
are
connected
to
the
leV
leg
of
the
base
resistors.
Each
connecMng
wire
represents
the
input.
This
input
could
be
either
1
or
0,
where
1
stands
for
Vcc
(posiMve/high
voltage)
and
0
stands
for
ground
(negaMve/low
voltage).
To
provide
the
respecMve
inputs,
the
truth
table
of
OR
gate
is
followed.
Input
A
Input
B Output
Q
0 0 0
0 1 1
1 0 1
1 1 1
On
providing
the
inputs,
if
the
LED
glows
this
means
output
Q
=
1
or
high.
If
the
LED
does
not
glow,
the
output
Q
=
0
or
low.
AVer
verifying
the
experimental
outputs
in
four
different
cases
of
the
inputs,
we
do
the
‘path
of
current’
analysis
and
reason
out
why
the
LED
glows
in
each
case.

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
for
quality,
innovaMon
and
high
producMon
value.
CoolJunk
has
been
featured
in
naMonal
and
internaMonal
journals
including
Wallstreet,
Yourstory,
Hindu
Business
Line,
NextBigWhat
and
was
tagged
as
the
coolest
Indian
start-­‐up
in
IAN
Bootcamp-­‐2011.
You
may
also
refer
to
the
video:
OR
GATE
For
more
projects
visit
our
website:
CoolJunk
Tools
and
Components
in
one
box.
Step
by
step
visual
instrucMons
Detailed
experiment
theory
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us
on: