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music · analog

An analog instrument voice, designed by AI

Analog builders want gain as a current, not a multiply in firmware. This board is a guitar-or-synth voice with no MCU: a high-Z instrument jack, a split-rail LM13700 VCA, a panel pot for volume, and a real headphone amp. Describe the voice; Ohmni wires the analog chain.

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A compiled board from the studio. Drag to look around.

What ends up on the board

  • USB-C power; analog voice on the 5 V rail, headphones on 3.3 V
  • 1 MΩ high-Z instrument preamp (TS jack)
  • Charge-pump negative rail so the VCA swings around ground
  • LM13700 VCA with a panel pot on the control voltage
  • DirectPath headphone amp (16–32 Ω, no output electrolytics)

How Ohmni designs it

  1. The analog chain is composed from light blocks — preamp, VCA, headphone amp — not a single synth-voice IC.
  2. Supply spans are checked (the LM13700 needs at least 4 V across the rails) and the layout is rule-checked before you see it.
  3. You download gerbers, a BOM, and a 3D preview, ready for your fab.

Design this board now

The prompt below goes straight into the studio. Edit it there, or use it as-is.

USB-C analog instrument: high-Z instrument preamp on the 5V rail, charge-pump negative rail, LM13700 VCA with a panel pot on the CV, and a 3.3V headphone amp. No microcontroller.
Free to use