Here’s a no-PCB Arduino that doesn’t obscure the DIP footprint of the AVR chip. It’s built on an ATmega88 chip, and includes a programming header, reset button, a couple of filtering caps ...

But you would if you’re a hacker stuck with a radio built in 2005 ... and an audio amplifier based on the LM386. A single button on the Arduino helps cycle through a range of preset frequencies ...

Despite sounding rather basic, the sample programs built into the Arduino IDE can help you with ... libraries by tapping the Manage Libraries button within the Tools tab.