Low power, CHEAP pink noise generator circuit

[[email protected]]

I am looking for a low cost, small, and CHEAP pink noise generator for
a project I am working on. It would preferably run from less than 3V,
consume less than 10ma (preferably MUCH less), and be buildable from
off the shelf surface mount components. I will be making a PCB layout
for it so it will be assembled on a stable surface. Any suggestions?
Also, do you have to "tune" a pink noise generator to specify the
maximum frequency? I mean, white and pink noise generators deviate from
the ideal right? I.e. they dont go up to 1000Ghz right and they have
some kind of roll off?

 

[Pooh Bear]

I am looking for a low cost, small, and CHEAP pink noise generator for
a project I am working on. It would preferably run from less than 3V,
consume less than 10ma (preferably MUCH less), and be buildable from
off the shelf surface mount components. I will be making a PCB layout
for it so it will be assembled on a stable surface. Any suggestions?
Also, do you have to "tune" a pink noise generator to specify the
maximum frequency? I mean, white and pink noise generators deviate from
the ideal right? I.e. they dont go up to 1000Ghz right and they have
some kind of roll off?

How much are you paying ?

Graham

 

[Phil Allison]

<[email protected]

I am looking for a low cost, small, and CHEAP pink noise generator for
a project I am working on. It would preferably run from less than 3V,
consume less than 10ma (preferably MUCH less), and be buildable from
off the shelf surface mount components. I will be making a PCB layout
for it so it will be assembled on a stable surface. Any suggestions?
Also, do you have to "tune" a pink noise generator to specify the
maximum frequency? I mean, white and pink noise generators deviate from
the ideal right? I.e. they dont go up to 1000Ghz right and they have
some kind of roll off?

** There is no natural source of pink noise - it can be created
artificially by filtering white noise with a constant 3 dB octave slope
roll off filter.

Sounds like you have SFA idea what pink noise is or what to use it for.




.......... Phil

 

[artie]

I am looking for a low cost, small, and CHEAP pink noise generator for
a project I am working on. It would preferably run from less than 3V,
consume less than 10ma (preferably MUCH less), and be buildable from
off the shelf surface mount components. I will be making a PCB layout
for it so it will be assembled on a stable surface. Any suggestions?
Also, do you have to "tune" a pink noise generator to specify the
maximum frequency? I mean, white and pink noise generators deviate from
the ideal right? I.e. they dont go up to 1000Ghz right and they have
some kind of roll off?

Find a copy of the old (1976!) National Semiconductor Audio Handbook.
National made a (digital) noise generator chip (pure unobtainium these
days), and published a design with the output of that pseudorandom
sequence generator feeding 1/f filters to give pink shaping for the
audio band.

The digital part of this thing you can do small and cheap --
oscillator, flops, xor gates.

A very good reference for pseudo-random sequence generators is Xilinx
App Note 052 (XAPP052), which gives taps for maximal-length sequence
generators up to 168 bits long.

The R/C part will take up space.

 

[Dirk Bruere at Neopax]

<[email protected]




** There is no natural source of pink noise - it can be created
artificially by filtering white noise with a constant 3 dB octave slope
roll off filter.

Waterfalls have an approximate pink noise characteristic
Of course, there is no natural source of white noise - never seen a hissing
steam pipe emit gamma rays

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[Dirk Bruere at Neopax]

I am looking for a low cost, small, and CHEAP pink noise generator for
a project I am working on. It would preferably run from less than 3V,
consume less than 10ma (preferably MUCH less), and be buildable from
off the shelf surface mount components. I will be making a PCB layout
for it so it will be assembled on a stable surface. Any suggestions?
Also, do you have to "tune" a pink noise generator to specify the
maximum frequency? I mean, white and pink noise generators deviate from
the ideal right? I.e. they dont go up to 1000Ghz right and they have
some kind of roll off?

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

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[Phil Allison]

"Dickhead Bruere at Neopax"


** Pisssssssssssssssssssss off - autistic moron.






.......... Phil

 

[Phil Allison]

"Dickhead Bruere at Neopax"

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

** Now explain how to get that cct to work from 3 volts, draw a tiny
current and cost SFA to make.

Plus explain why it meets to OP's unexplained app.




............ Phil

 

[Pooh Bear]

Find a copy of the old (1976!) National Semiconductor Audio Handbook.
National made a (digital) noise generator chip (pure unobtainium these
days)

Good thing too. The pattern is *very* audible.

Graham

 

[[email protected]]

"Dickhead Bruere at Neopax"



** Now explain how to get that cct to work from 3 volts, draw a tiny
current and cost SFA to make.

Plus explain why it meets to OP's unexplained app.

The "less than three volts" is mostly easy enough, if you cn find the
right amplifiers - the original noise source won't hack it, but a
pseudo-random binary sequence generator is a digital device and there
are plenty of low-voltage digital circuits on the market.

Whether you can get it all to work with less than 10mA is another
question. The Xilinx (formerly Philips) CoolRunner programmable logic
chips run down to 1.8V and don't draw much current if you don't clock
them too fast, A sufficiently ingenious engineer might use a FIR filter
to do the -3dB per octave filtering via a shift register on the
programmable logic chip.

http://www.xilinx.com/products/cr2/product_sheet.pdf

Phil would seem to be rather better at analysis than synthesis.

 

[David L. Jones]

I am looking for a low cost, small, and CHEAP pink noise generator for
a project I am working on. It would preferably run from less than 3V,
consume less than 10ma (preferably MUCH less), and be buildable from
off the shelf surface mount components. I will be making a PCB layout
for it so it will be assembled on a stable surface. Any suggestions?
Also, do you have to "tune" a pink noise generator to specify the
maximum frequency? I mean, white and pink noise generators deviate from
the ideal right? I.e. they dont go up to 1000Ghz right and they have
some kind of roll off?

You can use a single chip micro to generate pseudo-random white noise,
like this one:
http://www.web-ee.com/Schematics/TinyWhiteNoise/TinyWhite.htm

Add appropriate filter for Pink noise.

Dave

 

[Phil Allison]

<[email protected]>

The ** SLOW MAN FUCKWIT " strikes out again.

The "less than three volts" is mostly easy enough, if you cn find the
right amplifiers -

** Err - not the circuit as published or as quoted by the Dickhead wog
fuckwit !!

the original noise source won't hack it,

** So not the circuit as published or as quoted by the Dickhead wog
fuckwit

but a
pseudo-random binary sequence generator is a digital device and there
are plenty of low-voltage digital circuits on the market.

** Post one - you lying fuckhead.

Whether you can get it all to work with less than 10mA is another
question.

** Err - no it is not "another question " at all - you lying autistic
****.

It was one of the OP's **basic requirements** .

But since the OP is a ALSO a lying fuckwit TROLL he has not specifeid his
need.

Truth is - the PITA troll would not know "pink noise" from a fucking "pink
elephant".

Whether sober or otherwise.




........ Phil

 

[[email protected]]

<[email protected]>



** Err - no it is not "another question " at all - you lying autistic
****.

It was one of the OP's **basic requirements** .

And my post then went on to suggest a low-curent consumption
programmable logic device that might well do the job while consuming
less than 10mA, a point which Phil Allison doesn't seem to find himself
willing to criticise, which suggests that he is as incompetent in
electronics as he is in psychology and anatomy.

<snipped the rest of the rant, such as it was>

 

[Phil Allison]

<[email protected] = a CRIMINAL IDIOT

The ** SLOW MAN FUCKWIT " strikes out AGAIN !!

The "less than three volts" is mostly easy enough, if you cn find the
right amplifiers -

** Err - not the circuit as published or *as quoted* by the Dickhead wog
fuckwit !!

the original noise source won't hack it,

** So not the circuit as published or as quoted by the Dickhead wog
fuckwit

but a
pseudo-random binary sequence generator is a digital device and there
are plenty of low-voltage digital circuits on the market.

** Post one - you lying FUCKHEAD !!

Whether you can get it all to work with less than 10mA is another
question.

** Err - no it is not "another question " at all - you lying autistic
****.

It was one of the OP's **basic requirements** .

But since the OP is a ALSO a lying fuckwit TROLL he has not specifeid his
need.

Truth is - the PITA troll would not know "pink noise" from a fucking "pink
elephant".

Whether sober or otherwise.




........ Phil

 

[Spehro Pefhany]

Good thing too. The pattern is *very* audible.

Graham

It sure doesn't take many bits to make the pattern so long it is not
audible. Just about any little micro with a reasonably fast clock and
a bit of programming will be okay for most audio purposes.


Best regards,
Spehro Pefhany

 

[Ken Smith]

You can use a single chip micro to generate pseudo-random white noise,
like this one:
http://www.web-ee.com/Schematics/TinyWhiteNoise/TinyWhite.htm

Add appropriate filter for Pink noise.

If the micro has a DAC, you can do most of the filtering in software and
then add one high frequency stage externally.

 

[Dirk Bruere at Neopax]

<[email protected]>

The ** SLOW MAN FUCKWIT " strikes out again.







** Err - not the circuit as published or as quoted by the Dickhead wog
fuckwit !!






** So not the circuit as published or as quoted by the Dickhead wog
fuckwit






** Post one - you lying fuckhead.







** Err - no it is not "another question " at all - you lying autistic
****.

It was one of the OP's **basic requirements** .

But since the OP is a ALSO a lying fuckwit TROLL he has not specifeid his
need.

Truth is - the PITA troll would not know "pink noise" from a fucking "pink
elephant".

Whether sober or otherwise.

You really are a sad psycho.
Is there a pic of you on the net we can all get a look at?

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[Dirk Bruere at Neopax]

"Dickhead Bruere at Neopax"


** Pisssssssssssssssssssss off - autistic moron.






......... Phil

C'mon Phil - where's your pic - what have you got to hide you sad loon?

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[Phil Allison]

"Dirk Bruere at Neopax"


** Hey - Dirkhead Troll,

You have already clearly demonstrated to one and all your childish naivety
and incompetence in all maters technical.

Now you go one better and demonstrate you are net stalking pile of sub human
shit too.

Predictable behaviour for a narcissistic, autistic, trolling cretin on
usenet.





........ Phil

 

[artie]

It sure doesn't take many bits to make the pattern so long it is not
audible. Just about any little micro with a reasonably fast clock and
a bit of programming will be okay for most audio purposes.


Best regards,
Spehro Pefhany

The (relatively) short pattern of the Nat part is the reason for the
reference to XAP052 -- take an 8-pin PIC and implement a 160-bit long
LFSR. Clock it out as fast as you can, you won't hear that one repeat!