U4055B1 Overview
Description
The U4055B electronic speech circuit is a linear integrated circuit for use in telephone and other line fed terminal equipment. It replaces the common speech circuit with carbon microphone, hybrid transformer, sidetone equivalent and ear protection rectifiers.
Key Features
- Dynamic transducers with a minimum impedance of 100 W can be directly driven by these outputs
- applied to this stage
- DTMF IN The DTMF input has an internal resistor connected to ground
