MODERATOR, please merge his threads about this same thing. [Done. Moderation]
Asha, next time please continue your first thread about something instead of starting a new thread.
The article in your other thread showing the circuit of a noise generator shows the part numbers for 5 common zener diodes but not the one you cannot find.
The article says that a 12V zener diode produces 10 times more noise (+20dB) than lower voltage (5V) zener diodes.
Years ago I built a white/pink noise source from one IC. (From National I think.) Made with a long shift register and XOR gates in one small IC. It will take me hours to find the black box again.
Years ago I built a white/pink noise source from one IC. (From National I think.) Made with a long shift register and XOR gates in one small IC. It will take me hours to find the black box again.
A white noise generator produces random noise. Its high frequencies have more output power than low frequencies.
A pink noise generator is a white noise generator with the high frequencies reduced -3dB per octave. A pink noise generator produces the same amount of power in every octave band of frequencies and is used to measure the frequency response of speakers because using sine-waves produces echoes that interfere with the measurement.
Yeah I remember making one of those in the late 70's (maybe early 80's?) from a kit, it had a little DIP 8pin specialised IC in it, with a switch for white/pink noise. Ahh memories.
i remember using those.... i also remember if you listened carefully, you could hear the sequence repeat, because there was a click somewhere in the sequence.