Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and AnswersTopic Posted by: Reliability & Maintainability Forum (firstname.lastname@example.org )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Original Message:Posted by: Peter Kirchhofer (email@example.com )
Date posted: Fri Sep 21 8:31:59 US/Eastern 2001
Subject: Microphonic Effect of SMD Ceramic Capacitors
Problem: An FM demodulator printed circuit board produces an output signal, when the board is vibration tested on a shaker or if it is hit with any hard plastic tool. Mechanically decoupling the relevant capacitors fixes the problem, but this is an expensive solution. Question: Does anybody know about the related dielectric characteristics (e.g. capacity change vs pressure) for different capacitor dielectrica ?