Audio recording device
It is necessary to design a compact device for audio recording. The goal is a compact and thin device that attaches to the back panel of an iPhone using Magsafe but can also be used simply on a table or in any other place where recording is needed. Alternatives to such a device can be found on AliExpress.
The case will be made of aluminum in the final version, the prototype will be printed from plastic.
You are required to provide complete design of the device. The device must use the following components:
MCU 1: Sony Spresense (CXD5602GF)
MCU 2: ESP32-S3-PICO-1-N16R8
Flash memory: W25N08LWZEIG
Security: ATECC608A
Microphones: 4x Infineon IM69D130
IMU: MPU-6050
Board thickness 0.8 mm, 4 layers
Single-sided mounting. On the other side of the board, there will be only 2 microphones, Magsafe, and two batteries.
Traces to the microphones must be of equal length.
Microphones must be protected from interference from the board and vibrations.
Pogo-pin pads for microcontrollers must be provided on the board.
It is necessary to keep the thickness of the device as thin as possible.
The necessary details are not limited to the list above. Something else for charging, a USB-C port, and any other necessary components that you deem appropriate are also required. We can discuss microphone replacements.
Send your price for the development of such a device. If you can also design the case, that is a plus.
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40 days603 USD
258 40 days603 USD
Good day! We have reviewed your technical specifications — the task is clear and technically interesting. We have experience in developing embedded devices, multilayer PCBs, and compact electronics with high requirements for size and noise protection.
We are ready to carry out complete device design:
• Circuit design (considering MCU, memory, power supply, security)
• PCB design (4 layers, thickness 0.8 mm, optimization for minimum thickness)
• Routing considering:
— matched length traces to microphones
— EMI/EMC protection
… — minimization of noise and vibrations
• Integration:
— Sony Spresense + ESP32-S3
— Flash / ATECC608A
— 4x microphones (or we can agree on alternatives)
— IMU
• Power subsystem:
— charging (USB-C)
— battery management
— protection
• MagSafe integration
• Pogo-pin pads for debugging / programming
• Preparation for production (Gerber, BOM, assembly)
Additionally (we can do):
• Enclosure design (for 3D printing + final aluminum)
• Optimization for mass production
• Consultations on firmware architecture
We understand the criticality of:
• minimum thickness
• stable audio without noise
• correct placement of microphones
• thermal and electrical limitations
We will be able to accurately assess the cost and timelines after a brief technical discussion (there are a few points that affect the architecture).
We are ready to engage in the project and bring it to a working prototype.
Our website: https://benefit-it.net/
Sincerely, Benefit Studio
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35 days603 USD
231 35 days603 USD
Please advise: what target battery life do you expect and do you need data transfer via USB-C (mass storage/settings), or is charging alone sufficient? If you have a reference from AliExpress with the desired dimensions, please send it, as it will help to determine the thickness along with the case and batteries.
We have 4 years of experience in embedded systems (ESP32-S3, Raspberry Pi, Arduino) and projects with MEMS microphone arrays (PDM/I2S) with length matching, thin 4-layer PCBs of 0.8 mm, pogo pins, shielding/damping of vibrations, powering with 2xLi-ion, USB-C charging, and protection. We will prepare the schematic, stack-up, PCB, BOM, DFM, tests, and basic firmware for Flash recording. We can also design and print the prototype case.
We are ready to start this week — we will agree on the requirements, send a block diagram and timeline. Let us know a convenient time or share references.
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