Elenco 130-in-1 Electronics Playground - Manual (Page 85)

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In this experiment you will make a push/pull, square
wave oscillator. This oscillator is known a push/pull
because it uses two transistors that are connected
to each other. They take turns maneuvering so that
while one transistor is “pushing,” the other is “pulling.
This type of oscillator is called a square wave
oscillator because the electrical waveform of the
signal has a square shape.
Slide the switch to position A to turn on the power
after wiring the circuit. We will be using square wave
signals in later projects therefore, note the sound
from the speaker.
Notes:
EXPERIMENT #67: PUSHING & PULLING OSCILLATOR
Wiring Sequence:
1-29
2-30
3-83-101-41
4-131
5-81-102-44
40-82
45-42-119
43-84
120-132
Schematic