white noise controlled random number generator - Electronic Circuits Projects Diagrams Free

MSC · 2nd May 2007, 01:21 AM

hey guys,
we have come up with a basic circuit with a BC-548 and LM-358N to generate white noise for a random number generating circuit connected to a x-bit number display that counts upto a certain random number and cuts-off unitil its reset again. we are trying to employ a counter to do this function. the problem we are facing is, we cant figure out, how we relate, and interface and convert this random noise spikes that are generated, into this counter.

Any suggestions n thoughts would be greatly appreciated.

eng1 · 2nd May 2007, 12:52 PM

Is that a microcontroller-based counter? Lots of microcontrollers have built-in A/D converters, that allow you to convert the analog noise voltage to a digital value for your counter.

See also: related thread;
white noise generator on the PICList.

ericgibbs · 2nd May 2007, 01:14 PM

hi,
For reference a Zener diode can be used as noise generator, 'pink' or 'white'.

EDIT:
http://en.wikipedia.org/wiki/Colors_of_noise

**Nigel Goodwin** · 2nd May 2007, 01:38 PM

Quote:

Originally Posted by ericgibbs

hi,
For reference a Zener diode can be used as noise generator, 'pink' or 'white'.

Presumably the BC548 mentioned is connected as a zener diode to create the noise?, it's the common method - it's actually white noise, pink noise is produced by filtering the white noise.

Optikon · 2nd May 2007, 01:58 PM

Quote:

Originally Posted by MSC

hey guys,
we have come up with a basic circuit with a BC-548 and LM-358N to generate white noise for a random number generating circuit connected to a x-bit number display that counts upto a certain random number and cuts-off unitil its reset again. we are trying to employ a counter to do this function. the problem we are facing is, we cant figure out, how we relate, and interface and convert this random noise spikes that are generated, into this counter.

Any suggestions n thoughts would be greatly appreciated.

what about using a threshold detector and count the time between when a given threshold is exceeded. These times will be random and related to the noise.

gramo · 2nd May 2007, 02:13 PM

Quote:

Originally Posted by Nigel Goodwin

Presumably the BC548 mentioned is connected as a zener diode to create the noise?, it's the common method - it's actually white noise, pink noise is produced by filtering the white noise.

How do you mean? Have you got a circuit floating around somewhere?

**Nigel Goodwin** · 2nd May 2007, 02:30 PM

Quote:

Originally Posted by gramo

How do you mean? Have you got a circuit floating around somewhere?

Try here http://sound.westhost.com/project11.htm

gramo · 2nd May 2007, 03:20 PM

Geez, I think I will just stick to Number = Random

**Nigel Goodwin** · 2nd May 2007, 03:22 PM

Quote:

Originally Posted by gramo

Geez, I think I will just stick to Number = Random

Except it isn't

gramo · 2nd May 2007, 03:26 PM

lol, its random enough my my uses, and a quick analogue sample at the start on something (eg, a low cost RC circuit) gives a lot of starting places in the random table

Keep it simple stupid, that's my motto, unless things get ugly

**Nigel Goodwin** · 2nd May 2007, 03:27 PM

Quote:

Originally Posted by gramo

lol, its random enough my my uses, and a quick analogue sample at the start on something (eg, a low cost RC circuit) gives a lot of starting places in the random table

I've no problem with the random number sequence, it's just that you need a random number to seed it with!

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2nd May 2007, 01:21 AM	(permalink)
MSC	white noise controlled random number generator hey guys, we have come up with a basic circuit with a BC-548 and LM-358N to generate white noise for a random number generating circuit connected to a x-bit number display that counts upto a certain random number and cuts-off unitil its reset again. we are trying to employ a counter to do this function. the problem we are facing is, we cant figure out, how we relate, and interface and convert this random noise spikes that are generated, into this counter. Any suggestions n thoughts would be greatly appreciated.

2nd May 2007, 12:52 PM	(permalink)
eng1	Is that a microcontroller-based counter? Lots of microcontrollers have built-in A/D converters, that allow you to convert the analog noise voltage to a digital value for your counter. See also: related thread; white noise generator on the PICList.

2nd May 2007, 01:14 PM	(permalink)
ericgibbs	hi, For reference a Zener diode can be used as noise generator, 'pink' or 'white'. EDIT: http://en.wikipedia.org/wiki/Colors_of_noise __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 2nd May 2007 at 02:06 PM.

2nd May 2007, 03:20 PM	(permalink)
gramo	Geez, I think I will just stick to Number = Random __________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net

2nd May 2007, 03:26 PM	(permalink)
gramo	lol, its random enough my my uses, and a quick analogue sample at the start on something (eg, a low cost RC circuit) gives a lot of starting places in the random table Keep it simple stupid, that's my motto, unless things get ugly __________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net