DSA00131467.pdf
by Cermetek Microelectronics

Partial File Text Application Note #129: 911 Emergency Interrupt Circuit for CH1786 Modem Modules INTRODUCTION Application Note # 129 describes an external circuit that can be used with the CH1786 modem module to
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1 line 2 phone switch 1N914 CH1786 H11AA2 IN4148 LH1500 telephone ring generator circuit TLC555IDR