Audio Noise Generator Schematic

Posted on Feb 6, 2014

This simple circuit generates both white and pin noise. Transistor Q1 is used as a zener diode. The normal base-emitter junction is reverse-biased and goes into zener breakdown at about 7 to 8 volts. The zener noise current from Q G flows into the base of Q2 such that an output of about 150 millivolts of white noise is available. To convert the wh

Audio Noise Generator Schematic
Click here to download the full size of the above Circuit.

ite noise to pink, a filter is required which provides a 3 dB cut per octave as the frequency increases Since such a filter attenuates the noise considerably an amplifier is used to restore the output level. Transistor Q3 is this amplifier and the pink noise filter is connected as a feedback network, between collector and base in order to obtain the required characteristic by controlling the gain-versus-frequency of the transistor. The output of transistor Q3 is thus the pink noise required and is fed to the relevant output socket.

Leave Comment

characters left:

New Circuits



Popular Circuits

120Ac Shimmering Light Circuit
Metal Detector Circuit Schematic using Beat Frequency Oscillator (BFO)
home-made light-operated camera trigger
car sound generator schematic
Guitar pre-amplifier using uA 741
Unijunction Transistor Tutorials
Mk1 Schematics
TrikiBoard 8052