Duobay
Work

Real boards from our bench.

Layouts from past work by our Shenzhen engineering team, and reference designs you can start from. Client names are withheld. Every item is labeled for what it is.

Top-layer PCB layout of the matching wireless recorder receiver boardPCB layout
Engineering records

Boards we have laid out and brought up

Figures come from each product's specification. Detailed files and test data are shared on a call after a mutual NDA, where the client permits.

Bottom-layer PCB layout of a compact wireless recorder transmitter with a BGA SoC and flash memoryPCB layout

Wireless recorder, transmitter

Clip-on transmitter that streams to a receiver and records 48 kHz / 24-bit audio to 8 GB onboard as a backup.

  • Audio & voice hardware
Top-layer PCB layout of the matching wireless recorder receiver boardPCB layout

Wireless recorder, receiver

Matched receiver for two transmitters, with mono, stereo and safety-track modes.

  • Audio & voice hardware
Top-layer PCB layout of a round multi-microphone array boardPCB layout

Mic-array board

Round multi-microphone board for far-field voice pickup in desk and meeting devices.

  • Audio & voice hardware
Top-layer PCB layout of the receiver board of a long, narrow recording cardPCB layout

Strip recording card

Matched transmitter and receiver boards for a slim, stick-format recorder.

  • AI recording wearables

Platforms the team has built on

  • Bluetooth audio. Qualcomm QCC30xx and QCC51xx modules and dongles: LDAC, aptX family, LC3, LE Audio and Auracast. JieLi audio SoCs for headsets.
  • Wearables. Smart ring and smart watch PCBA and firmware on low-power Bluetooth LE, including Ambiq Apollo and Nordic.
  • On-device voice. A voice terminal on Espressif ESP32-P4 with an ESP32-C5 radio, controlling another system by natural language.
Engineering platforms →

Client projects

We publish a client project only with written permission, and never name a client without it. On a call we can walk through relevant unpublished work under NDA.

About our mutual NDA →
Reference designs

Start from a design that already works

Internal designs Duobay built for itself, not for a client. Starting from one can shorten Gates 1 and 2. You own every file made for your version.

Concept render of a clip-on lavalier transmitter with a magnetic clip and a recording lightConcept render
Internal reference design

Voice-capture badge

Two microphones, push-to-record, a visible recording light and encrypted upload to your cloud.

View design →
Concept render of a rugged 4G asset tracker with mounting tabs and screwsConcept render
Internal reference design

LTE & GNSS tracker

Cat-1bis or LTE-M battery tracker that reports to your own MQTT broker, with two BOM variants.

View design →
How to read this page

What each label means

  • PCB layout. A real layout from past work by our team. Shown without the client's name or product branding.
  • Concept render. A generated image of a product form. It shows what a device could look like, not a product we shipped.
  • Internal reference design. Duobay paid for it and built it. No client was involved, so it is not proof of a customer outcome.

Have a dev kit and a deadline?

Tell us what the device must do. An engineer replies within 2 business days with questions, not a sales deck.

Talk to an engineerMutual NDA
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