Triangular wave to sine wave

Thread Starter

cade007

Joined Apr 14, 2006
14
Is it possible to generate a sinewave from a triangular wave? I need some sort of sinewave generator and all of the chips I have found which generate a sine wave are no longer being sold. Any help would be great!
 

beenthere

Joined Apr 20, 2004
15,819
Hi,

You're probably unable to find the old ICL8038. Go to Mouser Electronics and get an NTE864 (I think the part # is 522-NTE864). It's the same circuit.
 

Thread Starter

cade007

Joined Apr 14, 2006
14
Originally posted by beenthere@Apr 18 2006, 12:46 AM
Hi,

You're probably unable to find the old ICL8038. Go to Mouser Electronics and get an NTE864 (I think the part # is 522-NTE864). It's the same circuit.
[post=16275]Quoted post[/post]​

I did see the ICL8038 and another one similar made by maxim, but I couldn't find anywhere that sold the chip. The NTE864 is exactly what I need! Thanks!
 

rdg151

Joined Apr 17, 2008
1
I need to generate a 500 Hz sine wave. It would be nice if I could adjust it from 1 to 1000 Hz. I bought an NTE864 yesterday. I've been playing with all the resistor and capacitor values I can think of and I still can't get anything but a 60 hz triangle wave. Can somebody please help me out here? Thanks.
 

SgtWookie

Joined Jul 17, 2007
22,210

beenthere

Joined Apr 20, 2004
15,819
Of course, and the sine wave would be a lot higher quality than the 8038's. The National Semiconductor op amp collection has one in it.
 

Wendy

Joined Mar 24, 2008
22,138
An op amp integrator will turn a triangle wave into a very close appoximation of a sine wave. It will not be pure, but you would have trouble telling the difference with the naked eye. Here is a variation I've shown several times in other posts.



In this thread SgtWookie was kind enough to do a SPICE simulation, I'll show the thread and the specific post. The thing I like about Sarges simulation is it shows the sine wave.

http://forum.allaboutcircuits.com/showthread.php?t=10755

http://forum.allaboutcircuits.com/showpost.php?p=64466&postcount=13
 

SgtWookie

Joined Jul 17, 2007
22,210
maybe a wienbridge op amp circuit could do the trick?
Yep, that would do it.

However, if he's already purchased and has in hand NTE's clone of the ICL8038, that doesn't help him a whole lot.

Using that function generator IC to simply generate a 500Hz sinewave is really quite a waste though, I'll have to agree.
 
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