June 2024
Intermediate to advanced
280 pages
11h 5m
English
Content preview from Make: Radio
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117Experiment 6: Audio Transmission via Pico
the noise enters the signal in the analog-to-digital converter and is related
to the high-frequency PWM signal the Pico creates. With the transistor in
place, the Pico has to handle and output less current, which leads to less
interference.
This is a common problem in circuits mixing digital and analog sections.
Noise from digital switching enters the analog signals. I tried different
modifications to reduce the noise. Adding capacitors between ground
and the different positive voltages, while generally a good idea, gave little
improvement. What did help was to use a separate ground pin on the Pico ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.