User Guide

Technical DocumentationPHF–1
Page 8
Original 03/97
Audio Section
V202, R201 and R202 generates +5VA audio d.c. voltage. V202 is the micro-
phone voltage regulator. N200 is the mic. amplifier. N200 is the differential am-
plifier wich eliminates disturbancies generated in curly cable ground wire resis-
tor. N200 has same function in XEAR line. R235 and C231 are low pass filter
wich eliminates noise. N300 is speaker power amplifier. R302, R303 and C303
stabilicies the power amplifier in high frequencies.