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Noise / White / Pink
Noise Generation Circuits Last Updated on:
Saturday, October 24, 2009 08:14 AM
Circuits Designed by Dave Johnson, P.E. :
AUDIO FREQUENCY DIGITAL NOISE GENERATOR
When you need to test an audio circuit with broadband noise, this circuit works
great. It uses just three inexpensive C-MOS ICs that generate a series of output
pulses whose widths vary randomly. I included a level control pot.
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
Audio Frequency Digital Noise Generator - When you need to test an audio circuit
with broadband noise, this circuit works great. It uses just three inexpensive C-MOS
ICs that generate a series of output pulses whose widths vary randomly. I included a
level control pot. ….(designed by David A. Johnson)
Audio noise generator drives earphones or small speaker - This is a circuit that
generates white noise, rolled-off to drive earphones or a small speaker. White noise
creates is a "rushing" sound, which sounds something like air rushing by your ear(s).
White noise would be flat with frequency, and since this circuit rolls off within the
audio range, I refer to it as "rolled-off" noise. White (or rolled-off) noise....
(circuit added 6/07)
Make Noise with a Pic - 08/07/03 EDN-Design Ideas: Building a stable noise
generator for audio-frequency purposes requires only a few components. The circuit in
Figure 1 relies on linear-feedback shift registers and some simple software. An
eight-pin Microchip (www.microchip.com)PIC12C508 controller (IC2)with a short program
generates pseudorandom noise at its output pin, GP0.....(design idea added 10/03)
Noise generator - Sometimes there is a need for a noise generator: this will work
well in the audio range and, without the 680pF capacitor, will extend in the radio
frequency range up to 20-30MHz. Voltage output may vary from 1Vpp to several volts
depending….(added 9/07)
Single IC forms pseudorandom noise source - 03/21/02 EDN-Design Ideas: Trying to
find a single IC noise source can be frustrating. National Semiconductor once made
such a noise source for audio applications, but it's now hard to find. This situation
leaves the designer with several choices, most of which involve using several ICs. You
can take the.....(design idea added 1/05)
White noise generator has no flicker noise component - 03/20/08 EDN-Design Ideas:
A white-noise generator with no flicker noise proves useful for testing circuits with
an extended low frequency response.....(design idea added 09/08)
