[sdiy] Help with (lack of) noise circuit

[Tim Ressel]

Funny how the simplest circuits can kick your butt. I'm trying to do the classic transistor noise generator, with no luck. I started with a 2N3904 with the emitter to +12 with a 100K resistor and the base to ground. I've tried resistors from 500 ohms to 1 meg, voltages up to 24 volts, and different transistors (PN2222, PN2484). No joy. What am I doing wrong?

Thanks!


Tim Ressel
Circuit Abbey
503-750-9331
timr at circuitabbey.com