Need help finding replacement for obselete IC chip

There's a data sheet at:

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

Try this too:

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

Ed wb6wsn

Really high voltage, that chip. A 5-V only device with similar specs could be easily produced with an 8-pin PIC.

Best regards, Spehro Pefhany

I read in sci.electronics.design that snipped-for-privacy@columbus.rr.com wrote (in ) about 'Need help finding replacement for obselete IC chip', on Sat, 8 Jan 2005:

You may not find a chip. There are many ways of generating noise. What bandwidth do you want?

This chip is nothing more than a 17-bit LFSR with an internal oscillator running at somewhere between 55 and 120 kHz. This is easily replicated with almost any of the small CPLDs available (you'd need an external clock). You could probably also program it into one of the 8-pin PIC devices if you need to keep the same size footprint.

You can get a data sheet here:

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.

chip.

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

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...)

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

Thanks for the info.

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

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

Here is a noise generator program for the ATtiny11 AVR:

It works very well.

Leon

Whoa! I thought that if it was on TV it HAD TO BE TRUE! Say it 'aint so.

-ScottL

I used a similar chip that was a bit more flexible, the AMI S2688. It had an external clock option so I could shift the noise spectrum to my needs. Device is also obsolete but was pin compatible with the 5837. I found 5 of them in the back room if there is any interest. Finding a data sheet could be a challenge though. Plug-in solutions are great but if I had to do it again, would do it in a PIC or AVR. Oppie