Electronics > Beginners
DIY Function Generator
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perfect_disturbance:
OK So I want to try and build a function gen i see there's a couple different ways to go with advantages and disadvantages.

Some people are using dedicated function gen chips like a MAX038 or XR2206 these actually seem pretty straigtforward but both of those chips are no longer in production.
and the only one I could flnd with a listed price on mouser was 80 bucks (which seems unreasonable hi so I may be looking at the wrong part)

http://www.mouser.com/ProductDetail/Exar/XR2206-11-12EB/?qs=sGAEpiMZZMs%252bwIVMMV7AyT%252ba%252bM0aLAJO

The other consept seems to be using a microcontroller (I'd probably use an atmega328) to directly synthesize the signal.  to do this I would need some sort of dac I've seen some people getting by with r/2r networks like this

http://www.mouser.com/ProductDetail/Murata/RGSD8L102G/?qs=sGAEpiMZZMvrmc6UYKmaNYgyMGTqqrwcgSLMHCLOy9Y%3d

I thought I could also use a dac ic but I'm not sure what part would work well for that.  I'd like something I could wire directly to the microcontroller (preferably parallel) with out a lot of other components.

What do people think?
M0BSW:
Hope you get plenty of replies , because Im looking for a winter project , and this sounds really interesting.
Paul
madires:

--- Quote from: perfect_disturbance on September 27, 2012, 03:19:53 pm ---Some people are using dedicated function gen chips like a MAX038 or XR2206 these actually seem pretty straigtforward but both of those chips are no longer in production.
and the only one I could flnd with a listed price on mouser was 80 bucks (which seems unreasonable hi so I may be looking at the wrong part)

--- End quote ---

25 years ago all EE magazines were full of XR2206 circuits :-) Just checked Reichelt, XR 2206CP for EUR 5,20, on stock. Has anyone tested the cheap MCU based DDS signal generators from ebay?
kripton2035:
here is the open source AVR DDS signal generator V2.0
http://www.scienceprog.com/avr-dds-signal-generator-v20/
kripton2035:
max038 on ebay around $15 free shipping...
http://www.ebay.com/sch/i.html?_trksid=p3984.m570.l1313&_nkw=max038&_sacat=0

xr2206 less than $3 on ebay...free shipping too
http://www.ebay.com/sch/i.html?_nkw=xr2206&_sacat=0&_odkw=max038&_osacat=0
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