This is the deal I got a nice outdated XR-2206

I'm starting like this Circuit. Anything you see I need to do to make it better.


Next problem I want use a 12 volt wall wart like this.

 

Hate that i'm talking to myself LOL what a deal you'd think after 9 year's Owell.

 

Is your output referenced to the artificial ground? If so then you won't be able to supply much power into your load -- not even a milliamp.

 

I forgot to mention that for a high quality output you need a fast op-amp that can drive a 100 ohm load.

 

The XR-2206 is kind of a crappy function generator. There is a good deal of distortion over 20 kHz. in the sine wave. The triangle has rounded and bumpy corners, and lastly the square wave has numerous artifacts, espacially at higher frequencies. I built one of these a long time ago (ca. 1978) and seldom used because it was just a piece of crap.

If you really need one, you should buy one or rent one.

 

I figured I'd play with it but after looking don't think it's going to be that much fun.

 

I'd like to suggest that a more modern project would be a DDS (Direct Digital Synthesis) module with an RPi interface. That would definitely get the juices going.

 

AD9834CRU something like that

 

Hi be80be, I found this schematic some time ago. Not sure who author is. I was interested enough that I purchased an XR2206 but have yet to test circuit.

Seeing your post makes me want to at least breadboard circuit to see how well it might work. I will post results when I have something to see.

I do have oscilloscope to check waveforms.

 

I have the parts and a scope I just wanted to start with the best circuit.
The only thing I don't have is a split supply. Was trying to come up with a work around for that I tested what I posted just don't think it will output
The power needed

 

I got a kit for Christmas using that chip, it's not that great, I have to admit.

Does make a nice sine wave at low frequencies tho...

 

AD9834CRU something like that

YES!! YES!! YES!,

I suspect my 10 MHz Siglent función generador is built around one of these.

My experience: the stumbling block is not other than the output filter.

Wait and you will see comments telling it is easy to design. But not for me.

I would like to write the code to program it. Really.

 

There's a short series of videos (by 'Scullcom Hobby Elecronics') on Youtube about his project to build a function generator using the XR-2206, an arduino nano and a 7 segment display. I copied his design almost to the letter, including the enclosure he used (except that I added a Function Counter which he never did get round to adding as originally planned) and it does work quite well, particularly in the audio ranges. I can only get to about 150kHz before the signal becomes quite distorted. My unit does also tend to 'drift' a bit after a while but I don't know if that is a feature of the chip or as a result of my construction . Anyone interested in playing with this chip may also like to have a look at the Exar XR-2206 Function Generator Databook which can be found in pdf format here . A picture of my completed version of Mr Scully's project is attached.

 

Well I tried it out not that fastest in the world but it can make some waves LOL

 

@ Standisher There was no pdf in your link you can post pdf here.

 

Hi @be80be , The link to the online pdf is in my post #13. The pdf is 7.5Mb , so I don't want to try to post it on the forum. You can download it from site. Click here.

 

Standisher Thank you

 

This is the deal I got a nice outdated XR-2206

I'm starting like this Circuit. Anything you see I need to do to make it better.

View attachment 144689
Next problem I want use a 12 volt wall wart like this.

View attachment 144694

Excellent! I JUST happened to find one of those chips last week in my ancient parts bin! I understand the chip is no longer in production, but plenty of NOS sources.

It's a wonderful chip.....I don't know WHY so many manufacturers discontinue absolute winners like this.

Nice job. I'm building a local oscillator for a low frequency receiver with this.