[sdiy] Help with (lack of) noise circuit

[Ove Ridé]

Have you
1) amplified the signal?
2) AC coupled output if you're amplifiying it using an opamp? (There
will inherently be a DC offset over the transistor.)

After some quick googling, this schematic looks neat. Controlling
another transistor with the reverse biased transistor. This makes
sense since the reverse biased transistor is really a current source,
I think.

http://www.sentex.ca/~mec1995/tutorial/xtor/xtor6/6fig7.gif

On 22 December 2013 00:52, Tim Ressel <timr at circuitabbey.com> wrote:
> 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
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-- 
/Ove

Blog: <http://blog.gg8.se/>

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