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User's Manual

ManualsBrandsTelit Communications ManualsElectronicsQuad-Band GSM/GPRS module - Type: GE863
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Telit GE863-QUAD / GE863-PY
Hardware User guide
1vv0300715, Rev. ISSUE#0, - 21/02/06
Reproduction forbidden without Telit Communication written authorization – All Right reserved – Right of modification reserved page 32 of 71
NOTE: The microphone sensitivity changes with the value of R2 and R3. Usually the microphones
are characterized with 2kΩ biasing resistance, so try to keep the sum of R2 and R3 around 2kΩ.
Refer to your microphone manufacturer for the mic. characteristics.