Is there a way to make a super simple white noise generator on a 9volt supply?
I noticed as well that most of the schematics (which were mostly 12 volts) had a dual supply. Is there a way to avoid that and still get the random white noise (pseudo-random is fine too)?
I don't really want to muck with the +/-9v because I don't really understand it.
The lousy old LM324 has such a poor high frequency response that the two in series, each with a voltage gain of 50 in that circuit will cut high frequencies at the output above only 5kHz. Audio goes up to 20kHz so two octaves are missing.
I would use a much better TL072 dual opamp or TL074 quad opamp that have a bandwidth to 40kHz when the gain is 50. Two in series have a bandwidth to 20kHz.