Manual

-18-
A
re you bothered by mice, do you not have a
mousetrap? You should try this next experiment to
help you instead—see if the sound of this cat can
k
eep the pests out of your life.
Just follow the drawing below and the wiring
sequence. To start the experiment switch the set to
B. Press down on the key and release it
immediately. You will hear the meow from the cat
coming from the speaker. If you adjust the control
knob while the cat’s meow is fading away, what
effect on the circuit operation does it have? Now set
the switch to A and try it once more. Now it sounds
as if the cat is begging for a dish of milk in a low,
long sounding tone.
To produce a variety of sounds try experimenting
with this circuit. Whatever you do just don’t change
the value of the 0.05mF capacitor to more than 10mF
or reduce the value of the 10kW resistor— or else
the transistor could get damaged.
N
otes:
EXPERIMENT #7: MEOWING CAT
Wiring Sequence:
o 1-29
o 2-30
o 3-41-109
o 4-72-82-132-114
o 5-106-110
o 27-40-105
o 115-113-42-119
o 71-138
o 81-28
o 116-131
o 120-137
Schematic
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