PASCO EM-8656 AC_DC ELECTRONICS LABORATORY - Manual (Page 92)

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AC/DC Electronics Laboratory 012-05892A
®
PART II: Sensor Calibration and Equipment Setup
• You do not need to calibrate the Voltage Sensor or Power Amplifier.
➀ Insert the 2N3904 transistor into the socket on the AC/DC Electronics Lab Board. The transistor
has a half-cylinder shape with one flat side. The socket has three holes labeled “E” (emitter), “B”
(base) and “C” (collector). When held so the flat side of the transistor faces you and the wire leads
point down, the left lead is the emitter, the middle lead is the base, and the right lead is the collector.
C = Collector
B = Base
E = Emitter
Socket
2N3904 transistor
Top view of transistor socket
➁ Connect the 22 k
Ω
resistor (red, red, orange) vertically between the component springs at the left
edge of the component area.
➂ Connect the 330
Ω
resistor (orange, orange, brown) horizontally between the component springs
to the left of top banana jack.
➃ Carefully bend the wire leads of the red light-emitting diode (LED) so it can be mounted between
component springs. Connect the LED between the component springs to the left of the 330
Ω
resistor. Arrange the LED so its cathode (short lead) is to the left (away from the resistor).
➄
Connect a wire lead from the component spring at the base terminal of the transistor to the
component spring at the top of the 22 k
Ω
resistor.
➅
Connect another wire lead from the component spring at the collector terminal of the transistor to
the component spring at the left end of the LED.
➆
Connect a red banana plug patch cord from the top banana jack to the positive (+) terminal of the
DC power supply.
➇
Connect a black banana plug patch cord from the negative (-) terminal of the DC power supply to
the component spring of the emitter terminal of the transistor.
red
black
22 k
Ω
+5 v
Power Amplifier
2N3904
e
b
c
330 Ω
LED
Channel A
red
black
npn Transistor as Digital Switch
➤ CAUTION: Connecting the
transistor incorrectly can destroy
the transistor.