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Metro 328 and car audio amplifier
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Metro 328 and car audio amplifier

by wagnerpj on Sun Sep 20, 2020 7:46 pm

I'm planning on creating some programmed PWM tones with Arduino using your Metro 328. I want to be able to amplify the tones through a high-power (line-level input) car amplifier. I need to make some noise...

Do you suggest getting one of your DAC boards or one of your audio shields? Is this necessary with the output capabilities of the Metro 328?

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Re: Metro 328 and car audio amplifier

by adafruit_support_bill on Mon Sep 21, 2020 5:45 am

The raw output of the Metro 328 is 5v. You could attenuate the signal down to line-level with a pot. But your waveforms will be limited to square-waves.

Using a DAC, you can write programs to synthesize other waveforms. https://www.adafruit.com/product/935

With the MusicMaker shield, in MIDI mode, you can generate tones using any of instrument voices built into the chip: https://www.adafruit.com/product/1788

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