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.
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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