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The Tsunami is a powerful and flexible signal generator, analyzer, and experimenter's kit built on the Arduino platform.
The Tsunami is a powerful and flexible signal generator, analyzer, and experimenter's kit built on the Arduino platform.
The Tsunami is a powerful and flexible signal generator, analyzer, and experimenter's kit built on the Arduino platform.
316 backers pledged £15,024 to help bring this project to life.

Enclosure update, and Howto part 3: Using the tsunami to measure frequency response

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Good news! If you're backing at the Explorer tier, and you'd like an enclosure, your enclosure will be red. Show off to your friends and family the fact that you got a Tsunami before everyone else, while still protecting it as thoroughly as possible!

We can't be 100% certain yet that the enclosures will be ready at the same time as the explorer units; if they're not, we'll ship them out to you separately as soon as they are.

Using the Tsunami to measure frequency response

In parts 1 and 2, we discussed the Tsunami's basic signal generation and measurement capabilities. Today, we'll demonstrate how to combine these building blocks to do something more sophisticated: measure frequency response.

As a test subject, we'll be using my Objective2 headphone amplifier. We simply connect the Tsunami's signal generation output to the amplifier's input, and the amplifier's output to the signal generator's input.

After tweaking the volume knob a bit for a useful output voltage, we can load a simple sketch onto the Tsunami:

 After initializing the Tsunami, and configuring it with a useful output voltage for the application, we sweep through the frequency range from 55Hz to 200KHz. At each step, it pauses for 200 milliseconds, then reads the input voltage from the Tsunami's input and prints it out along with the current frequency.

Plotting this gives us a quick visual look at the amplifier's frequency response:

 As you can see, it's pretty good - the frequency response is almost perfectly flat all the way from 55Hz up to well beyond audio frequencies. My purchase of this headphone amplifier was clearly a good one - almost as good as your decision to back the Tsunami. ;)

In the next update, we'll look at some of the Tsunami's more sophisticated output features.

Kean, Alexander Becker, and 4 more people like this update.

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