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Telephone related circuit diagrams

Telephone circuit diagrams, phone bugs, custom ring tone... Make your phone glows when someone calls you and similar.

Telephone In-Use Relay Controller


Telephone In-Use Relay Controller circuit diagram
[View Telephone In-Use Relay Controller circuit diagram]


Telephone Audio Interface


Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed in series with the transformer line connection to prevent DC current from flowing in the transformer winding which may prevent the line from returning to the on-hook state.
[View Telephone Audio Interface circuit diagram]


8 Line Intercommunication using 89c51


This project is aimed to make the low cost intercom system by which eight telephone lines can be interfaced with this hardware.
[View 8 Line Intercommunication using 89c51 circuit diagram]


Telephone Hold Button


Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a hold feature will find this circuit very useful.
[View Telephone Hold Button circuit diagram]


Ringing Phone Light Flasher


This circuit is extremely simple, therefore there is less chance of any problems. It can be placed anywhere on the phone line and it will record any conversation on any phone on that line.
[View Ringing Phone Light Flasher circuit diagram]


Phone Busy Indicator


Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection? Well, this simple circuit should put an end to that. It signals that the phone is in use by lighting a red LED.
[View Phone Busy Indicator circuit diagram]


Cut Phone Line Detector


When the circuit detects that a phone line has been cut, it activates a MOSFET which can be used to drive a relay, motor, etc. It can also be connected to a security system.
[View Cut Phone Line Detector circuit diagram]


Telephone amplifier


While talking to a distant subscriber on telephone, quite often we feel frustrated when the voice of the distant subscriber is so faint that it is barely intelligible. To overcome the problem, circuit of an inexpensive amplifier is presented here. It can be assembled and tested easily.
[View Telephone amplifier circuit diagram]


Soft Musical Telephone Ringer


The normal telephone bell, at times (specially during night when one does not want to be disturbed), appears to be quite irritating. The circuit shown here converts the loud sounding bell into a soft and pleasing musical tone.
[View Soft Musical Telephone Ringer circuit diagram]


Phone Hold With Music


This circuit will allow you to place a phone call on hold and if you wish to have them listen to music while they are on hold.
[View Phone Hold With Music circuit diagram]


Cellular Phone calling Detector


This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED
[View Cellular Phone calling Detector circuit diagram]


Telephone line monitor


This nifty little circuit lets you record your phone conversations automatically
[View Telephone line monitor circuit diagram]


Ringing Phone Light Flasher


Makes your 220/110V bulb flashes when telephone rings. Can be very useful when you need silence, or just want to have strange phone :)
[View Ringing Phone Light Flasher circuit diagram]


FM Telephone Bug


Extremely easy to build and very useful transmitter
[View FM Telephone Bug circuit diagram]


..:: Important ::..

Read disclamer, please!

 

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