Manual

-122-
W
hite noise is a noise that has a wide frequency
range. One kind of white noise is the static noise
you hear when you tune your FM radio to an area
w
ith no station. When you play electronic musical
instruments, you can use white noise, a normally
useless noise, as a sound source.
When you complete building this circuit, set the
switch to position A to turn on the power. Look at the
schematic. You will use the noise that is generated
when you apply a reverse voltage to the base and
the emitter of transistor Q1.
IC 1 acts as an oscillator. The output of this
oscillator is rectified by diodes D1 and D2, and flows
to Q1. IC 2 amplifies the noise so that you can hear
it through the earphone. In this circuit, the control is
used as a 50k
W fixed resistor.
N
otes:
EXPERIMENT #102: WHITE NOISE MAKER
Wiring Sequence:
o 26-64-90
o 28-13-EARPHONE
o 121-114-112-46-47-70-96-84-85-14-EARPHONE
o 93-48-101
o 94-111-127
o 82-88-63-132-126
o 76-89-65
o 113-66-81-83
o 77-91-67-110
o 68-95-92
o 69-80-87-86
o 78-79
o 109-128-125
o 119-124
o 122-131
o 102-75
Schematic
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