Jigglypuff works in a noisy office, and wanted to avoid the complaints that their built-in laptop mic was garnering during Teams meetings.

Instead of juggling muting in the software itself, they converted a vintage Turner CB desk mic into a digital USB microphone using Teensy 4.0.

After an initial prototype proved unsatisfactory, Jigglypuff switched to the Teensy Audio Shield and a PUI AOM-5024 series electret condenser mic. Unfortunately, the Teensy Audio Shield would not fit inside the Turner, leading to the creation of a custom shield without unwanted features like the mSD slot and line in/out. The final device features push-to-talk with an LED if the mic is active, a pot for mic gain adjustment, a 125Hz high-pass filter, and the all-important ability to present itself as a microphone, not a full-duplex sound card (since it has no output capabilities). Pretty impressive for someone who claims “EE and software is not my primary background.” Learn more and follow the journey in the PJRC forum thread.