One tool that I’ve been missing at my lab at home is function generator. They tend to be a bit expensive, so I haven’t bought one. I thought this might be a good opportunity to try and make one myself. I found a pretty common DDS (direct digital synthesis) chip, called AD9833. Then just strap a USB-enabled AVR micro there and maybe some analog electronics.
![USB Function Generator Based on AD9833 USB Function Generator Based on AD9833](http://3.bp.blogspot.com/-uPFJB9Sbf-g/UHxvseCYmsI/AAAAAAAAG7Q/T6u-vjUnQkQ/s1600/fgen-pic.jpg)
This board doesn’t do any of the special analog magic to allow for variable amplitude or offset for the signal. The output is fixed to 0-4v. I’m planning to make another completely analog board for adjusting amplitude and offset. [Link]
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