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External microphone (low level machine signal acquisition) for mobile devices

This project received 3 bids from talented freelancers with an average bid price of $296 USD.

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Employer working
Project Budget
$250 - $750 USD
Total Bids
3
Project Description

We are in need of an external acoustic body-sound microphone for mobile devices (Android tablets and smartphones, iPhone, iPad) for acquisition of very low level acoustic mechanical signals. Currently we are using piezo buzzers for this purpose, connected to the mobile device via a cable with a standard [url removed, login to view] 4-pole RCA jack. These buzzers do the job on average, for better signal quality we are seeking for an improved solution.

This “acoustic sensor” should meet the following preferences:

- structure-borne (“body-sound”) sound acquisition
- preferably equipped with an inline pre-amplifier, power supply via battery or (better) the mobile device’s Headset/USB interface
- low power consumption
- low noise level
- low cost
- small footprint (20-30mm)
- ready-to-use assembly to fit via a [url removed, login to view] RCA jack to all common smartphones and tables with this kind of headset plug

We are expecting a complete solution package of design, material sourcing and ready-to-use assembly of a cost-per-piece base, initially we are awaiting a first run of 250-1000pcs, which can increase up to a few thousand or more pcs.

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