User's Manual

CL865-DUAL Hardware User Guide
1vv0301104 Rev.1 – 2014-03-07
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 45 of 70
Mod. 0805 2011-07 Rev.2
10.1.1. MIC Connection
If a “balanced way” is anyway desired, much more care has to be taken to VMIC noise and
ground noise.
TIP: Since the J-FET transistor inside the microphone acts as RF-detector-amplifier, ask
vendor for a microphone with anti-EMI capacitor (usually a 33pF or a 10pF capacitor placed
across the output terminals inside the case).