Manual

-17-
In this experiment you are going to make a circuit
t
hat sounds like the mockingbird.
Follow the wiring sequence and observe the
drawings. Don’t forget to make all the proper
connections and have fun!
To finish the circuit below, slide the switch to the A
position to turn on the power. No sound will come
from the speakers yet. When you press the key you
will hear a sound quite like a bird singing from the
speaker. When you release the key, you will still be
able to hear the chirping sound but eventually it will
slow down and stop. The first transistor “Q1” is
dropped off from the battery when the key is
released. Transistor “Q2” still produces the bird
sound until the controlling current from transistor
“Q1” stops.
Try using a different value capacitor instead of the
10mF and the 100mF capacitors. These capacitors
control the amount of electricity reaching the
transistors. Listen for the difference. Make sure to
start keeping notes on your experiments.
Notes:
EXPERIMENT #6: TWEETING BIRD
Wiring Sequence:
o 1-29
o 2-30
o 3-106-110
o 4-41-131-138
o 5-44-109
o 40-114-91-75
o 42-85
o 43-105-86-77
o 119-45-115-113-92
o 76-137
o 78-116
o 120-132
Schematic
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