I have a little speaker with a pam8403 amplifier. I also have a teensy which is outputting audio through the audio shield.
When the teensy and the speaker are powered by different batteries, it works fine - the speaker plays the audio as expected.
However, when they're both connected to the same battery, the audio is very feeble and noisy.
I've read online before that a lot of people do use separate batteries for the speaker and the synthesiser - however, I've made a few synthesiser projects in the past - using the same teensy 4.1 and pam8403 amplifier. In the past, I've connected them both to the same battery and it's been fine - so my question is, what might I be doing differently here, and how can I wrangle it to use the same battery for both?
When the teensy and the speaker are powered by different batteries, it works fine - the speaker plays the audio as expected.
However, when they're both connected to the same battery, the audio is very feeble and noisy.
I've read online before that a lot of people do use separate batteries for the speaker and the synthesiser - however, I've made a few synthesiser projects in the past - using the same teensy 4.1 and pam8403 amplifier. In the past, I've connected them both to the same battery and it's been fine - so my question is, what might I be doing differently here, and how can I wrangle it to use the same battery for both?