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Audio Shield for Teensy 4.x Projects with Playback, Input, Mixing, and Effects
The Teensy 4 Audio Shield (Rev D) makes it much easier to build audio projects around a Teensy 4.x board. It adds stereo audio input and output, headphone drive, a microSD slot, and a proven path into the PJRC audio tools.
If you want to build samplers, synths, streamers, effects units, FFT analyzers, recorders, or sound-reactive devices, this shield gives you a cleaner starting point than building the analog audio path yourself.
Important: This is an add-on board. It does not include the host Teensy board or the long headers needed for every mounting style.
Why you'll love it
- 16-bit, 44.1 kHz audio path: A strong fit for music and embedded audio projects
- SGTL5000 codec onboard: Handles conversion and headphone drive
- microSD slot included: Useful for samples, WAV files, and recordings
- PJRC audio tools support: Speeds up routing, effects, and synthesis development
- Made for Teensy 4.x layouts: A cleaner fit for modern Teensy audio builds
Comparison table
| Product | Works with | Category | Main edge |
|---|---|---|---|
| Audio Adapter Board for Teensy 3.0 - 3.2, 3.5 and 3.6 | Teensy 3.2 / 3.5 / 3.6 | Teensy 3.x audio add-on | Line in, mic in, line out, headphone out |
| Teensy 4 Audio Shield (Rev D) | Teensy 4.0 / 4.1 | Teensy 4.x audio shield | Shield-style stereo I/O with microSD support |
| Teensy 4.0 | Teensy 4 Audio Shield (Rev D) | Teensy 4.x host board | Compact 600 MHz host for audio DSP and playback |
| Teensy 4.1 Development Board | Teensy 4 Audio Shield (Rev D) | Teensy 4.x host board | More I/O and expansion for bigger audio systems |
What you can build
Use it for streamers, samplers, audio visualizers, sound effect boxes, modular-style synth experiments, voice projects, and custom audio control hardware.
Starter bundles
A typical build pairs this shield with Teensy 4.0 or Teensy 4.1, plus a microSD card, audio cables, and optional controls like potentiometers and encoders.
Recommended add-ons
Helpful add-ons include a compatible Teensy board, a 25K potentiometer for volume, microphones, speakers or headphones, and storage for audio files.
Technical specifications
| Product | Teensy 4 Audio Shield (Rev D) |
|---|---|
| Audio Codec | SGTL5000 with headphone amp |
| Audio Quality | 16-bit, 44.1 kHz |
| Audio Outputs | Stereo headphone and line-level output |
| Audio Inputs | Stereo line input / supported audio capture use |
| Storage | microSD card slot |
| Extra Features | 4-channel software mixer support via PJRC tools |
| Best Host Boards | Teensy 4.0 and Teensy 4.1 |
| Headers | Board-to-board headers not included |
| Best Use | Audio playback, effects, synthesis, and analysis |
Pinout & power notes
The shield is designed around Teensy audio workflows using I2S audio and the PJRC software stack. It is best paired with Teensy 4.x when you want a direct path to serious audio projects.
Official resources
Official audio adapter and shield page · Rev D audio shield resource page · Teensy Audio Library · Teensyduino setup
If you are planning effects chains, synthesis, or stream routing, the PJRC audio library is the most useful outside reference.
What’s in the box
1 × Teensy 4 Audio Shield (Rev D)
Frequently Asked Questions
Does this include the Teensy board? No. The host Teensy board is sold separately.
Which board should I pair with it? Teensy 4.0 and Teensy 4.1 are the best direct matches.
Can it play audio from a microSD card? Yes. The onboard microSD slot is useful for stored audio files.
Are long header pins included? No. Headers are not included so you can choose your preferred mounting method.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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