Noise generator, "pink noise"

A good pink noise generator and a spectrum analyser are indispensable if you want to analyse the acoustic properties of a room (usually a living room). Moreover, you also need a microphone with a frequency characteristic that is as linear as possible (from 20Hz to 20kHz). If you have an equaliser, then the response can not only be checked but also corrected. The kit is easily adapted to produce "white noise".

Specifications
* pseudo random digital noise
* regulator sliding length: 33 bit
* clock frequency: adjustable between 30 and 100kHz
* pink noise filter: 3dB / octave (20Hz to 20kHz)
* output voltage: 150mVrms
* output impedance: 1Kohm
* power supply: 9 - 12VAC or 12 - 15VDC / 5mA
* PCB dimensions: 72 x 43mm / 2.8 x 1.7"