Mic ETS2228 Instrukcja Użytkownika Pobierz pdf (Strona 17)

ETS2228 Maintenance Manual

Figure 6 TL494

The differential amplifier can work within the range from AC -0.2V to 0.2V. The time overflow

controller has a fixed offset to assure the stable output in case of the changed external input. The external

oscillating circuit can be set through Rt/Ct (The working frequency to be set is 100KHZ).

3 .Power supply anti-reverse-insertion circuit and external

interface

D305 and D301 fulfill the anti-reverse=insertion function of the external power supply. EXT_DC

signal: Whether or not the external power supply exists; V_BATT signal: Battery voltage;

VREG_PHONE signal: Voltage of the second-time power supply.

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Mic ETS2228 Instrukcja Użytkownika Strona 17