Tsunami
Tsunami is a signal generator built on the Arduino platform.
It is the brainchild of Nick Johnson at Arachnid Labs and has secured funding on Kickstarter for its commercial launch. It can be pre-ordered for $60.
The design is based on the Arduino Leonardo module and this combined with a direct digital synthesis (DDS) chip for generating analogue signals.
The board generates frequencies with a 2.5ppm accuracy. It can be used to generate signals – sine, triangle, and square waves – all the way from DC up to around 2MHz.
Output amplitude can be adjusted from 0 to 6V peak-to-peak, and DC offset by up to 2V either side of ground.
The Tsunami can also be used to measure signals> It does not use the Arduino’s ADC, but has its own high speed comparator, allowing it to measure frequency up to nearly 8MHz. A peak detector allows it to measure signal amplitude and there is a phase detector.
By connecting the output of the Tsunami to an analogue filter or an audio amplifier, and using the Tsunami’s input to measure what comes out, it is possible to measure how it responds at different frequencies. The phase detector detects the phase delay, which means you can construct bode plots.
The same basic technique can be used to measure unknown inductors, capacitors, or networks of them.
The DDS has built in support for phase and frequency modulation, and the Tsunami adds on support for amplitude modulation too.
The developer is creating a software library of projects such as building an audio synthesizer, to measure the response curve of an audio amplifier, make a digital theremin and read and write data tapes from classic computers (Commodore, Atari, etc).
“We’ve put a lot of effort into making the Tsunami as simple to use as possible, with an easy to use Arduino library that covers all the Tsunami’s functions. Generating a sine wave, for instance, is as simple as telling the Tsunami what frequency you want,” said the developers.
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