The audio circuitry from the Raspberry Pi 3. The low-pass filter’s 220R and 100nF now give it a cut-off of just over 7kHz, and the high-pass filter’s 100R and 47uF give it 33Hz.

The Raspberry Pi 3 Model B+ is a slight upgrade over the existing model, but the addition of dual-band Wi-Fi is going to make life easier for tinkerers.

The new model, called the Raspberry Pi 3 Model A+, uses the same quad-core 1.4GHz Broadcom processor as the high-end Model B+. It also has the same support for Bluetooth 4.2 as well as 2.4GHz and ...