TM 11-5805-384-30
1-8. BLOCK DIAGRAM PRESENTATION. (CONT)
SEND AMPLIFIER CIRCUIT
The send amplifier is a transistorized amplifier which amplifies voice signals from the microphone element and signals generated by the
telephone set. This circuit also matches output impedance to the switching facility.
RING ACKNOWLEDGE TONE DETECTOR CIRCUIT
The ring acknowledge tone detector circuit is made up of five subcircuits. The five circuits and their functions are explained below:
570 Hz Amplifier
The 570 Hz amplifier amplifies the 570 Hz ring and acknowledge signals. The amplifier also controls the on-hook impedance of the
Telephone Set.
Threshold Control Circuit
This circuit produces a dc output from the 570 Hz amplifier output signal which controls the threshold of 570 Hz limiter circuit and
bandwidth circuit.
1-5
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