All items tagged with oscillator and phone (6)

1-12-2003 | This circuit produces a ringing sound similar to that made by more recent telephones. It consists of three almost identical oscillators conn...

1-07-2003 | Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmi...

1-07-2002 | This simple circuit will tell you, by sounding a buzzer and flashing a LED, that a telephone line is in use. If the telephone line is free,...

1-07-1998 | The circuit in the diagram was originally designed to monitor an oscillator, but can also be used as a general-purpose level indicator f...

1-07-1986 | Alan G Hobbs 18telephone-bell simulator This circuit is intended for use in a small private telephone installation. The ringing tone sequenc...

1-12-1980 | xylophone elektor december 1980 — 12-09 With Christmas practically on the doorstep, small, sound producing circuits become very popular. T...