Nick Bryant (bryant@mpr.ca) wrote:
: I am now looking for a simple circuit which will generate a white
: noise signal, suitable for the AUX input of a spare amplifier I own.
: Does anyone have a _proven_ circuit they would care to share?
Yes, I have a _proven_ circuit.
An easy way to realize white noise
==================================
There is a very easy way to realize a white-noise-circuit.
Take a bipolar npn-transistor and a resistor. That's all.
The trick is, you must need the inverse basis-emitter-
breakdownvoltage (about 7V) as following circuit shows:
|-----------------------------------------o +15V
|
R1 = 470 k-Ohm
|
|------------------> U-noise = 5 - 20 mV
|
e \| To amplify U-noise take a highimpedance-opamp,
b |---- BC107 like a bi-fet-type is, as example LF356, TL071.
c /| |
|
|
|----------------------------------o GND
With other transistor-type it can be you must change the resistor
R1 between about 100k-Ohm and 1M-Ohm for best results.
So I hope I can help you. If you have more questions write to my
mailbox please
Thomas
=============================================================
| Tel + FAX: * * * |
| +41 01/632'6583 * * * |
| (2768) * * * E-Mail: |
| +41 01/256'0823 (FAX) * * * schaerer@isi.ee.ethz.ch |
| * * * ======================= |
| * * * |
| * * * |
| Thomas Schaerer |
| Organ.: Swiss Federal Institute of Technology Zurich, ETHZ |
| Depart.: Signal and Information Processing Laboratory ISI |
| Address: Sternwartstr. 7 CH-8092 Zurich, Switzerland |
=============================================================
Date:
Original Subject: