Telephone Speech Circuit

Description The U4030B is an electronic speech circuit for standard and feature telephones. It replaces the hybrid transformer, earphone and microphone interface and the supply voltage generation for external components, e.g. dialer or microcomputers. Using the U4030B in telephone circuit designs

Telephone Speech Circuit

Description The U4030B is an electronic speech circuit for standard and feature telephones. It replaces the hybrid transformer, earphone and microphone interface and the supply voltage generation for external components, e.g. dialer or microcomputers. Using the U4030B in telephone circuit designs

电话语音电路

ISA 48 Channel TTL Digital Interface

Features • 48 channels of buffered TTL I/O • Each 8-bit port individually configurable as input or output • Built around true dual 8255 parallel I/O chips • Power (+5V and +12V) and ground provided on connectors • Two industry-standard 50-pin solid-state relay rack connectors • SeaI/O Classi

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