Audio Looper Schematic Design

flux

Done.
Changes made:
  • Replaced the five tall PTV09A pots with short Bourns 3386P vertical 10 kΩ trimmers:
    • RV1, VR1, VR2, VR3, VR4
  • Reconnected each trimmer correctly:
    • Pin 1 → GND
    • Pin 2 → Teensy ADC signal
    • Pin 3 → 3V3
  • Placed the trimmers in a lower control row with more clearance from ENC1.
  • Rotated/repositioned J2/J3 so their socket openings face outward through the left board edge, with the jack bodies inside the board.
Verification:
  • Trimmer schematic nets are restored correctly.
  • Focused checks for J2, J3, and the trimmers show no matching open issues.
Routing around the moved/replaced parts will need cleanup before the next full PCB validation.
chrubble

chrubble

The audio jacks are STILL the wrong way round. The Teensy is also the wrong way round. The Teensy USB port should be at the edge of the board.

flux

I’ll correct the physical edge orientation now: flip the audio jacks to the opposite direction and move/rotate the Teensy so its USB connector sits at a board edge, then run focused checks.

flux

Updated the placement again:
  • J2/J3 audio jacks were moved to the right board edge and flipped from the previous orientation so the openings should now face outward from the board.
  • U1 Teensy 4.1 was moved/rotated so its USB port is at the top board edge for cable access.
  • Focused checks for J2, J3, and U1 show no open review issues tied to those parts.
Because J2/J3 and U1 moved, the existing routing in those areas is now stale and will need cleanup/rerouting before final validation.
Clean up routing
Verify jack orientation
Run full review
Check manufacturability
Explain stale routing
  • Generic Inductor
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Teensy 4-Track Audio Looper

Teensy 4-Track Audio Looper thumbnail
Compact Teensy 4.1-based 4-track audio looper with SGTL5000 audio shield, stereo line I/O, microSD storage, pots, buttons, LEDs, and rotary encoder control surface.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$14.80–$21.31

Digi-Key

$56.24

HQonline

$8.16

LCSC

$19.26–$22.47

Mouser

$67.39

TME

$6.30

Verical

$66.46–$103.52

Controls