Noise generator without the need for additional power supply

This noise generator is designed to be connected to the microphone input of a computer and does not require additional power.

The disadvantage of the circuit is that it is sensitive to external interference. When I put it on the UPS, a signal from its transformer (50 Hz) began to prevail.

Circuits that rely on a strong noise source require higher supply voltage and higher current, so they cannot be powered from the microphone input in this way.

I used a germanium PNP transistor and a silicon NPN transistor, you may need to adjust the resistors if you use other transistors.

I'm not sure how much the output signal is affected by the mounting method (on a breadboard, not with solder on a PCB).

The noise generator can be used with randomness mixers like these and Doublerandom.

New version:

The noise source is made with the Ge BJT transistor ГТ2 307. The resistor is between the base and the emitter, this is not a mistake, it really works like this.

The signal on the channel 1 is different than the signal on channel 2 (it's amplified and the capacitor 15n is decreasing the low frequencies).