1-8. BLOCK DIAGRAM PRESENTATION. (CONT)
DETECTOR OUTPUT CIRCUIT (CONT)
Energize the 1633 Hz tone oscillator during ring sequence.
Energize the send amplifier during release sequence.
Energize the control transistor Q1 during the ring or acknowledge sequence.
The timer circuit is made up of three subcircuits. The three circuits and their functions are described below:
Release Timer Circuit
The release timer circuit is controlled by the hookswitch and is designed to produce a low voltage output when the handset is placed in