Function Generator

[dschoon]

Im looking for ideas to make a function generator that produces either a square, sine or triangle wave output along with being able to vary the frequency and amplitude. Any ideas or schematics would help. Thanks.

 

[David Bridgen]

The Exar function generator chip, XR2206, is worth a look. Very easy to use.

 

[plot]

Check out this project:
**broken link removed**

might give you some ideas if nothing else.

 

[David Bridgen]

It is difficult, if not impossible, to maintain low sine distortion with the ICL8038 at lower frequencies. I spent quite a bit of time trying to get better results and eventually gave up in disgust in favour of the XR2206.

I have no idea if Exar's "improved" version addresses this problem.

(I wonder why they bothered when they already had the XR2206?)

 

[will7]

I perchest a kit from dicksmith electrinics that produces a sine/square wave from 2 to 20KHz the only thing is that I cant seem to get the sign wave working it uses a twisted ring counter set up then a butterworth low-pass filter(an MF4CH-50 IC) and the twisted ring counter is made up of 5 4013 D flipflops. hope this helps.