PIC16F628 based Caller ID
Caller Line Identification displays on a (2×16) LCD the phone number of the person who is ringing you, before you even answer, this number stays on the LCD till it will be replaced by a new received phone number or if the button is pressed.
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Read more original source:
http://www.picbasic.nl/nummermelder_uk.htm
Categories: Telephone Tags: pic-microcontroller, PIC16F628, Telephone
Telephone Remote Switch
This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings are available to improve the useability and security of the device. The kit comes complete with a small plastic case with silk-screened front and rear panels.
Read more original source:http://www.electronickits.com/kit/complete/tele/ck603.pdf
Categories: Telephone Tags: Remote control, Telephone
Watch-Dog for Telephones by NE555
Most of the telephone security devices available in market are simple but quite expensive. These devices provide blinking or beeping type line-tap/misuse indications. Quite often they do not offer guaranteed protection against unauthor-ised operation. A very simple and uni- que circuit of a telephone watch-dog to safeguard subscriber telephone lines against any fraud is described here. This little circuit keeps continuous watch over the telephone lines and sounds an alarm in case of any misuse. In addition it transmits a loud tone through the telephone lines to prevent further misuse.
Read more source: http://electronics-diy.com/electronic_schematic.php?id=557
Categories: Audio diagram, Telephone Tags: NE555, Telephone
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