Contain More Than 1000 Schematics

Telephone and intercom related schematic

1-line telephone status indicator (PDF)

300 baud modem circuit schematic

4-line telephone status indicator (PDF)

8-line intercom system using 89C51 microcontroller

Assorted telephone circuits

Caller ID decoder

Caller ID decoder part 1

Caller ID decoder part 2

Cellular Phone calling Detector

Cut Phone Line Detector

Cut phone line detector

Cut telephone line detector

Detecting a telephone RING

Digisound ring modulator

Digital/Standard Phone Line Tester

DTMF decoder / logger

FM Telephone Bug

FM telephone line bug transmitter

Greek telecard reader

Hold function for Telephone

Home made PBX / PABX

Incoming call indicator

Infinity Transmitter Schematic and Plans

Line in use indicator (PDF)

NCDS Interface Schematic for Nokia 3110, 8110, 8110i

Phone Busy Indicator

Phone In-Use Light

Phone line in use indicator

Phone Line to Audio

Phone Off-Hook Indicator

`phone rang` indicator light

Phone ring circuit schematic

Phone to audio interface

Phone-In-Use indicator

Ringing Phone Light Flasher

Simple circuit to connect telephone equipment to audio mixer

Simple Phone Tap

Simple telephone line tap for intercepting telephone calls

Soft musical telephone ringer

Talking phone dial monitor

Taxi phone automatic dialler

Telephone amplifier

Telephone Audio Interface

Telephone autodialler

Telephone Hold Button

Telephone in use light

Telephone interfacing / caller ID using a PIC microcontroller

Telephone In-Use LED Indicator

Telephone In-Use Relay Circuit

Telephone Line Monitor

Telephone line monitor

Telephone line simulator

Telephone music on hold box

Telephone music on hold interface

Telephone privacy adapter

Telephone Recorder

Telephone recording circuit

Telephone ring controlled relay

Telephone Ring Generator Using 60Hz Power Transformer

Telephone Ring Generator Using Switching Power Supply

Telephone ringing circuits

The Link 4+0 - Internal Intercom

The Link A2B+1 (the Link Telephone Intercom - DTMF version)

The Original 2 Phone Intercom Link Design

Universal telephone hold

Use old phones as an intercom

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