Explore Circuits - Phone Miscellaneous Circuits




Circuit / Schematic diagram	Description

9 Line Telephone sharer	Able to handle nine telephone set at different location using a single telephone line.
Hold Tone for Telephone	Based on UM66
Telephone hold with music
Door Phone Intercom
Full duplex door phone
DTMF Tone Decoder	Displays telephone numbers decoded from tones
Simple PBX
Message waiting flasher	This circuit starts flashing when the phone rings and continues flashing it until the phone is picked up to remind you to check your voice- mail.
Telephone in use indicator	It will allow users to know if the phone is being used.
Off line telephone tester	Test telephone equipment without connection to a telephone line
Single number auto dialer	Always dials a single number when handset is lifted
Cellular phone base audio mute switch	Mute your audio devices when a phone call is received.
Cut phone line detector	Detects the discontinuity in telephone line.
Phone line tester
Secrecy for Parallel Telephone
Telephone Line Vigilant	Protects the misuse of telephone.
Four line internal intercom	This Link provides four internal intercom phones with no outside line access.
The Link telephone Intercom
The Link telephone Intercom 2	DTMF version
Two phone line link	This is the circuit that sparked off all the other Link Telephone Intercom designs.
Telephone dial alarm	Microcontroller based.
Telephone line base audio muting	The circuit would automatically light a bulb on arrival of a phone ring and simultaneously mute the music system/TV audio.
Telephone based Remote Control	It enables switching ‘on’ and ‘off’ of appliances through telephone lines.

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