-
-
Transistors are very important, and you may need to
test them to be sure they are workin
. You can’t tell if
one
s wor
ng
ust
y
oo
ng at
t,
ut t
s c
rcu
t
et
you test them. This circuit also checks whether
tr
n
i
tor i
PNP or
n NPN.
You’ll notice that this project has three lon
wires - on
for the emitter
one for the collector and one for th
base. The schematic shows the terminals marked
o
checkin
PNP transistors.
To use this experiment, connect the long wires to th
base, collector, and emitter o
the transistor you wan
to test. Turn the control
ully counter-clockwise. Then
press the key and turn the control clockwise. Th
transistor is a working PNP transistor i
you hear a
ound
rom the speaker. I
you hear no sound at all
change connections 4-124 and 119-138 to 4-119 an
124-138, and repeat the test. If you
et a sound from
t
e spea
er t
s t
me, t
e trans
stor
s a wor
ng
type. If you get no sound from the speaker using eithe
et of connections
the transistor is defective
You’ll
ind this a handy circuit
or testin
unmarked
transistors as you start to accumulate parts
or othe
electronic circuits
t
:
EXPERIMENT #127: TRAN
I
T
R TE
TER
Schematic
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