Need help finding replacement for obselete IC chip

I am working on a circuit that calls for a MM5837N noise generating IC chip.
This is an obselete chip and I need to find a chip that can take its place.

Any help in locating an alternate chip would be great.

 

[John Woodgate]

I read in sci.electronics.design that elehman1@columbus.rr.com wrote (in
<QtJDd.65783$mA3.13229@fe2.columbus.rr.com&gt about 'Need help finding
replacement for obselete IC chip', on Sat, 8 Jan 2005:

I am working on a circuit that calls for a MM5837N noise generating IC chip.
This is an obselete chip and I need to find a chip that can take its place.

Any help in locating an alternate chip would be great.


You may not find a chip. There are many ways of generating noise. What

bandwidth do you want?
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

[Wim Ton]

I am working on a circuit that calls for a MM5837N noise generating IC
chip.
This is an obselete chip and I need to find a chip that can take its
place.

According to google, it still seems available form various sources.

An alternative may be to use an 8 pin uC like the ATTiny11 or a similar PIC.
The only change is that you have to insert it the wrong way round and patch
the Gnd to pin 8 (the MM5837N has an unusual pinout)

Wim

 

[Ed Price]

<elehman1@columbus.rr.com> wrote in message
news:QtJDd.65783$mA3.13229@fe2.columbus.rr.com...

I am working on a circuit that calls for a MM5837N noise generating IC
chip.
This is an obselete chip and I need to find a chip that can take its
place.

Any help in locating an alternate chip would be great.

http://www.usbid.com show a supplier with 495 in stock.

There's a data sheet at:

http://www.alldatasheet.co.kr/datasheet-pdf/pdf_kor/NSC/MM5837N.html

And this engine shows two vendors in China with about 500 pieces:

http://www.hqew.com/en/buyer/inventory/search.asp?keyword=MM5837N&sltType=IC&imageField.x=34&imageField.y=12

Try this too:

http://www.candisc.com/ranger/stock18.htm

Inland Empire, in Southern California, where I have bought some rare items a
few months ago, has about 100 pieces:

http://www.lookic.com/parts/?parts=MM5837N&B1=Request+a+Quote


Ed
wb6wsn

 

[Mike Meakin]

Now, there is a coincidence I was thinking about this very chip a couple of
days ago after seeing the reviews for the new film "White Noise". Many years
ago I built up a a white noise generator for some experiments with 'Raudive
Voices' -see

http://www.mdani.demon.co.uk/stunt/jun97s1.htm for details on EVP

These chips produce such signals albeit purely electonic and yes with
concentration (and imagination) you CAN 'hear' voices ! Sadly the pseudo
random cycle repaeats every couple of seconds with the National parts which
is a little distracting.

As for a practical solution a PIC would be absolutely ideal and I am sure
that a quick Google will even find some code. I could even be persuaded to
write a code snippet myself if that fails !

Another method to generate white noise is is to use amplified 'noise' from
Zener diodes or reverse biased transistor junctions ?

White Noise is also used for sleep inducers (sometimes, somewhat topically
as 'crashing waves' or surf) and I believe that sustained very high power
white noise is used as a torture during interrogation !

For audio applications it needs to be turned into 'pink noise' !!!

I am somewhat sceptical about the more paranormal explanations - just
remember the brain has evolved as a 'recognition machine' and seeks to make
sense of the senses so sort of explains some 'ghost' type phenomena as well.

Mike Meakin





<elehman1@columbus.rr.com> wrote in message
news:QtJDd.65783$mA3.13229@fe2.columbus.rr.com...

I am working on a circuit that calls for a MM5837N noise generating IC
chip.
This is an obselete chip and I need to find a chip that can take its
place.

Any help in locating an alternate chip would be great.

 

[mc]

<larwe@larwe.com> wrote in message
news:1105206612.624678.287130@c13g2000cwb.googlegroups.com...

I am somewhat sceptical about the more paranormal explanations - just

One day, I want to make a TV series based on some pseudoscientific
principle. I want to have a 15-second introduction in which I state
explicitly:

There is no such thing as [buzzword].
We invented it for this TV show.
Now it's on TV, crackpots will appear claiming that it's a real
phenomenon.
Please remember that they're crackpots.
Of course this won't stop the crackpots.

Touche'. In another field, I pity the ancient/medieval historians who are
now having to deal with people who WILL NOT believe that "The Da Vinci Code"
is fiction!

(To a limited extent I am one of them. Originally trained in historical
linguistics, I know Latin, Greek, and Hebrew, and I get questions about such
things. Now I have people coming up to me and saying Constantine rewrote
the New Testament - it has to be so, because Da Vinci Code says so. To
which I reply, what about all those papyrus manuscript fragments from before
Constantine's time? They're not in The Da Vinci Code so they must not be
real...)

 

[Hal Murray]

I have often idly wondered how the designer comes up with the taps for
this service.

Mathematicians collect them.

There is a small table in Art of Electronics. Xilinx has a much
bigger table in one of their app-notes. Google for LFSR.

--
The suespammers.org mail server is located in California. So are all my
other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited
commercial e-mail to my suespammers.org address or any of my other addresses.
These are my opinions, not necessarily my employer's. I hate spam.

 

[Clive Tobin]

Found it! It is table 3 of
http://direct.xilinx.com/bvdocs/appnotes/xapp052.pdf covering all
combinations from 3 to 168 stages.

Thanks. Not that I'll ever know how they derive it, or need to use it
again...

 

[Richard Crowley]

<elehman1@columbus.rr.com> wrote ...

I am working on a circuit that calls for a MM5837N noise generating IC
chip.
This is an obselete chip and I need to find a chip that can take its
place.

Any help in locating an alternate chip would be great.

Is there something so special that you MUST use an obsolete (and
likely ridiculously expensive) chip for such a generic function?