Low power, CHEAP pink noise generator circuit

How much are you paying ?

Graham

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

......... Phil

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.

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:-)

"D*****ad Bruere at Neopax"

......... Phil

"D*****ad Bruere at Neopax"

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

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

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

Graham

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.

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

You can use a single chip micro to generate pseudo-random white noise, like this one:

Add appropriate filter for Pink noise.

Dave :)

The ** SLOW MAN F****IT " strikes out again.

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

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

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

Whether sober or otherwise.

....... Phil

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.

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

In article , David L. Jones wrote: [....]

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

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

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

"Dirk Bruere at Neopax"

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 s*it too.

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

....... Phil

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!