Tuomas designed a simple function generator controlled via USB. It’s capable of generating sine, square, and triangle waveforms up 3 MHz. The device uses the AD9833 SPI programmable waveform generator IC and a USB-enabled AVR to control it.
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.
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