The Simple White Noise Generator Circuit is a DIY project that produces sound like radio hiss or static; so we use this circuit for sound effects, privacy noise, and testing audio equipment.”
Noise come from electronic parts, so we can use resistor or reverse transistor for noise, also capacitor remove too high or too low sound.
Circuit Working:
Parts List:
| Components | Values | Quantity |
|---|---|---|
| Resistors | 6.8k 1/4 watt | 1 |
| 68k 1/4 watt | 1 | |
| Capacitors | 4.7μF 50V | 1 |
| Semiconductors | Transistor BC547 | 1 |
| Zener diode 10V | 1 |
To begin with, this circuit generates white noise using a BC547 transistor, also a 10V Zener diode in reverse breakdown produces the noise and connects to the transistor base.
Furthermore, Zener is main part for making noise and diode must be in correct direction and also two resistors control current and 4.7uF capacitor remove bad high or low sound and shape noise.
Also, we need high voltage to about 24V for strong noise so we can build this circuit on PCB then just copy diagram and connect parts to right pads.
Formulas:
We can make simple white noise circuit using transistor noise and here is easy formula for noise voltage:
en = √(4kB * T * R * f)
where:
- kB is Boltzmann constant with 1.38 × 10⁻²³ J/K
- T is temperature in Kelvin
- R is resistance
- f is bandwidth in hertz
White noise have flat sound over big frequency range and we must test different parts and values to get good white noise.
Moreover, easy circuit use resistors, Zener diode and BC547 transistor which has it has own noise, so try different resistor values to get best noise for our use.
How To Build:
To build a Simple White Noise Generator Circuit follow the below mentioned steps:
- First, gather all parts like BC547 transistor, 10V Zener diode, resistors R1 and R2 and capacitor C1.
- Next, connect collector of Q1 to +24V through resistor R1, connect base of Q1 to 10V Zener diode and then connect emitter of Q1 to ground.
- After that, connect resistor R2 between collector and Zener diode and then connect capacitor C1 from Zener diode to ground.
- Finally, take noise output from point between R1 and collector of Q1.
Safety:
- Circuit uses high voltage 24V to 26V not like small 9V ones, so if anyone is new to electronics then ask help before working with high voltage.
Conclusion:
To conclude, Simple White Noise Generator Circuits use Zener diode and BC547 transistor, also it make static sound by boosting and shaping noise from parts.
If we need high voltage from 24V to 26V to work well, then build on PCB for clean design and be careful with high voltage.