Micro Speaker for Electronic Stethoscope

ISL replicated a very particular 90ohm speaker, about the size of a dime, that had gone end-of-life.

90 ohm Mini Speaker Electronic Stethoscope

Overview

ISL was approached by a current customer that had a specific 90ohm speaker go end-of-life. This particular micro speaker was a crucial component in their electronic stethoscopes. If the customer was forced to use a different speaker, they would have inured very high product redesign costs.

Challenge

Since this particular speaker was already being used in a current product, ISL had to develop an identical speaker to fit the current form factor, as well as meet the same performance criteria. We analyzed the existing product’s mechanical, acoustical and electrical specifications. Each Stethoscope is individually tested and tuned as part of the final outgoing QC. As a result of the specific tuning process, we had to ensure a low deviation for all of the speakers.

Solution

By utilizing ISL’s continuous source manufacturing service, our customer was able to continue using their existing design. Here is a synopsis of the Continuous Source Manufacturing process pertaining to this project:

  • ISL replicated the form fit and function of the existing components that make up the device.
  • We tooled needed parts at nominal expense to the customer.
  • Designed and ran a pilot-build for the customer’s qualification.
  • Our successful pilot-build led to the customer’s acceptance of the new speaker design.

Conclusion

Through continuous source manufacturing, ISL replicated an end of life 90 ohm speaker with the exact form, fit, and function the customer's electronic stethoscopes required, avoiding a costly product redesign. A successful pilot build confirmed that the new speaker met the same tight acoustical and mechanical tolerances used during final stethoscope tuning, giving the customer full confidence in the replacement part. Tooling was completed at nominal expense, keeping the transition affordable while preserving product performance. This project highlights how ISL keeps legacy designs alive and reliable long after original components become obsolete.

Components designed to your specifications

At ISL Products, we streamline the transition from initial design to final production. Provide us with your component specifications, performance targets, and any environmental constraints. We will analyze your requirements and provide a detailed quote and technical roadmap to help you hit your production deadlines without compromising on quality.

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  • Direct collaboration to optimize your component’s design and manufacturability.
  • Tailored performance to meet your exact mechanical and environmental needs.
  • Seamless transition from initial prototyping to high-volume production runs.
  • Precision-tested components to ensure long-term reliability and performance.