Are you talking about a true random number generator or a pseudo random number generator, they are two entirely different things.
Bob
Doesn't have to be "true" random (Is there such a thing? ... no, just "very good random" I don't want that, I want pretty lights that look random lol.) just an extremely basic random "number" generator, let's say... 50/50 (on/off)... can it be done and display it in some way (LEDs?) without any kind of IC.
I know I could easily build one with an IC, I just want to build a small veroboard example with NO ic, that has a red and green light, with no discernible pattern, 50/50 is ideal, but, anywhere near that (40/60, 30/70) is acceptable.
EG: a red led and a green led, 50/50... pseudo random is fine, as long as there isn't a predefined set (Although I doubt a defined set would be possible without an IC anyway, and if it is... a very long set would do too.. say a predefined set of reds/greens 500 long [but again.. I can't see that without an IC being involved]).
If you only need a low number you can use an astable multivibrator or transistor chaser circuit that you can interrupt.
For more than that you would need more complex counters (ICs) or a way to quantise a thermal noise source.
Low number... 1 and 0... do you have an example?
Edit: Raven, thermodynamics kinda sucks, although I've been reading about oddities in various experiments which seem to at least in part, defy the second law...
Edit2: It's an interesting one, it's to win a (non monetary) bet, I will post results if successful, including a shot of the build and a gutted engineer....
Edit3: something like this:
http://www.qrp.pops.net/LEDs.asp (Sequentially Off LED Pulser) 3 leds, somehow keeping the power on (so it runs) and showing ONE led when a button is pressed..... lol I don't know, I'm clutching at straws...