Telephone and Intercom Circuits (02)

Circuit Collection: Telephone, Ring Indicators, Modulators, Incoming call, indicators, Relay Circuit, Audio Interfacing, Caller ID, PBX, PABX, Busy Indicator, FM Telephone Bug, Phone Tap, Recorder, Modem, music on hold, Line in use indicators, Phone Off-Hook Indicators, Line Monitor, Intercom, DTMF decoder, logger, Telephone amplifier, privacy adapter, ringing circuits, automatic dialler, Light Flasher

About Project Links

• Telephone Line Monitor
• Use old phones as an intercom
• Phone-In-Use indicator
• Hold function for Telephone
• Digital/Standard Phone Line Tester
• Caller ID decoder part 1
• Caller ID decoder part 2
• DTMF decoder / logger
• Cellular Phone calling Detector
• Phone line in use indicator
• Telephone music on hold interface
• Soft musical telephone ringer
• Telephone amplifier
• Telephone line monitor
• Cut telephone line detector
• FM telephone line bug transmitter
• Simple telephone line tap for intercepting telephone calls
• The Link A2B+1 (the Link Telephone Intercom - DTMF version)
• The Link 4+0 - Internal Intercom
• The Original 2 Phone Intercom Link Design
• 8-line intercom system using 89C51 microcontroller
• Universal telephone hold
• Talking phone dial monitor
• Telephone line simulator
• Telephone privacy adapter
• Telephone ringing circuits
• Simple circuit to connect telephone equipment to audio mixer
• NCDS Interface Schematic for Nokia 3110, 8110, 8110i
• Assorted telephone circuits
• Greek telecard reader
• Phone ring circuit schematic
• Cut phone line detector
• Telephone autodialler
• Taxi phone automatic dialler
• Phone Busy Indicator
• Cut Phone Line Detector
• Telephone Hold Button
• Telephone Recorder
• FM Telephone Bug
• Simple Phone Tap (Derek Tombrello)
• Ringing Phone Light Flasher