Random generator

[arefatx]

Is this true random Generator? I guess someone can predict the output if they can read the algorithm inside the chip ;)

[ndro84]

hey man..!! do u hav the diagram? i'd like your random generator...

[Alu10000]

@ndro84

No, i haven't wrote the diagram of this circuit.

[madamerotten]

@ndro84 Google ART'S THEREMIN PAGE DIGITAL NOISE GENERATOR and you'll see a similar circuit.

[Greenselves]

it`s great!!

[rroge5]

this circuit is in no way , random!.

[thunderhorsedave]

The LFSR isnt truely random, if i was to construct 2 of these with the same polynomials they would give me exactly the same results.

There is a way i know of to make a true random number generator and that would be an LFSR that has been seeded by a noise source like an amplifed zener diode.

[sciencoking]

can you also change the probability of "on"-events?

[Alu10000]

No. Infact it is a "random" generator.

[stereoclark]

Please give us the entire sequence on video!

[Alu10000]

Are you kidding? The entire sequence counts over 4 billion of bits.

[stereoclark]

Sorry, it was just a bad joke

[Alu10000]

Oh, i hadn't understood. Sorry

[crobc1]

@Alu10000

4 billion entirely predictable counts! Apparently random is not the same as random. That is why this machine is called a "pseudo-random number generator."

[Alu10000]

@crobc1

You're right :-)

[rroge5]

i love this project

[edgesweets]

So to make this more random you need a dynamic way of wiring up the circuit. Any thoughts on how to do this?

[ivanatora]

How do you make the random 0/1 with LM555?

[Alu10000]

The 555 is the oscillator. It generates a square wave (the "clock") for the four SN74198. The 198's and the 86 generates the random sequence of zeros and ones, not the 555.

[Amazontoni]

I know 74198 is a shift register and 7486 is a couple of XOR gates, but I can't figure it out how can you make random number with these, since 555 oscilates at fixed frequency (unless you are using some tricky wiring schematics for 555 if that is the case?)

[Alu10000]

The shift registers and the xor gates are connected to make a "LFSR" (Linear feedback shift register): some outputs (LED) are connected to the xor gates and the result is connected to the input of the register. The 555 works like a simple oscillator, nothing else. The 555 generates the "clock" for the shift register. So the random sequence of zeros and one is the output of the shift register, not the output of the oscillator.

[edgesweets]

I'm interested in recreating this circuit. Could you post the wiring diagram? I've researched the LFSR but am curious how you wire the SN74198 to the SN7486 and the LEDs.

Also if you put two of these circuits side by side and applied power to both at the exact same time would the pattern be different? I keep reading about taps and LFSR's you basically have to set one of the gates to 1 to start the feedback?

[Alu10000]

The pattern will be different only if you change some wirings.

[edgesweets]

So on the SN7486 you set one or more of the gates to 1 then you'll get a different sequence?

Also will the every time you put power to the circuit do you get the same sequence?

[Alu10000]

The input of exor gates are connected to some output of the shift register and the output of the exor gates is connected to the input of the shift register.

And every time i put power to the circuit the circuit will get out the same pattern.

[twirlywirly55]

hi that is really good

i have the components to make something. i was going to make a circuit with 74LS74 dual D-type flip-flop chips , but dose anyone have an idea of what i could use the flip-flop chip for i also have a toroidal transformer and some rgb Leds

thanks

[Alu10000]

I used only SN74198, SN7486 and NE555, not SN7474.

[whoisondrugs]

That is absolutely beautiful work! Approximate cost? I'd like to use something like that with nixie tubes when I am out of poverty.

[Armony89]

davvero complesso..alla fine pero' l'effetto e' da paura XD

[Alu10000]

Ma no non è complesso. Si tratta solo di un registro a scorrimento a 32 bit (4 registri di 8 bit in cascata), quattro porte exor che generano la sequenza e una sorgente di clock (NE555).

[gavincurtis]

You know enough about electronics to prosper. You are so far ahead.

I can't remember if you are self educated or college. Either way... you will win.

I wish I had your energy. ;)

[Alu10000]

Thanks!

At first I was a self educated boy, then I went to school and I graduated in electronics. And now I go to university specializing in electronic engineering.

[cortexedge]

supeeeeeeer cool!!!

[fishstixman]

BLue LEDs cost so much...

[gewehrmeister3777]

~30-40USD for 1,000 on ebay.

[TheRealDevil]

AWESOME!!!!!!!!

[ifeelluckyy]

Hi

it's so good i have made a 6 bit divider from lfsr