Audio White Noise Generator Circuit

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Audio white noise generator circuit. It has medical implementation too. Use of white noise generator. In most audio applications even most that aren t test instrumentation what you generally want is pink noise that s like white noise that passes through a filter that decreases the amplitude 3 decibels per octave of bandwidth that gives you equal noise power in. Figure 1 pink noise generator circuit diagram basic filter the bc548 transistor is connected so its emitter base junction is reverse biased which creates a nice noisy zener diode.

White noise creates is a rushing sound which sounds something like air rushing by your ear s. White noise has a wide range of usage. Overview of the circuit the circuit that produces white noise is fairly simple in nature. The circuit uses all discrete parts that are both active and passive.

Simple white noise generator this two transistor white noise generator has a surprising feature about 30db more noise than the more traditional designs. 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. A flow chart of the circuit is shown in figure 1. It is a part of electronics engineering.

For lack of a better title i dubbed this one the mc4558 pink generator. The reverse biased emitter base junction of q1 provides the noise source which is fed into the base of q2. White noise is useful to obtain the impulse response of an electrical circuit. This circuit is the pink noise generator for audio testing by rod elliott i have reproduced the white noise amplifying stage and the pink noise filter stage that follows in ltspice shown at right.

This two transistor white noise generator has a surprising feature about 30db more noise than the more traditional designs. White noise has random frequency thus we can generate random numbers from white noise. The output sees 10 kω r s and a 50 nf c x to ground. For this white noise generator circuit some output capacitance that leads to peaking can be a design feature rather than a hazard.

The filter doesn t have enough break points to cover the audio band particularly accurately although it is better than you might imagine. And it s white noise. This capacitor c x will interact with the ltc2063 circuit resulting in some peaking in the frequency response. The reverse biased emitter base junction of q1 provides the noise source which is fed into the base of q2.

It consists of four stages or fragments noise generation signal amplification low pass filter and audio output stage.