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Noise Generator

Noise Generator
The noise generator proposed here operates according to the digital principle, in contrast with the more classical noise generator, which usually employs the noise voltage of a base/emitter junction to generate the signal. The big difference between the method used here and the classical analogue design is that we are not generating a real noise voltage but a collection of discrete frequencies.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R2 = 56k?
R3 = 2k?2
R4 = 3k?3
P1 = 5k? preset
Capacitors:
C1,C3,C4,C5 = 100nF
C2 = 820pF
C6 = 3nF9
Semiconductors:
T1,T2 = BC547
T3 = BC557
IC1 = 74HCT14
IC2,IC3 = 74HCT164
IC4 = 4077
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