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Telephone Ringer Circuits
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Last Updated:
June 02, 2021 01:44 PM |
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:
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Audio-Visual Extra Ringer for Phone - Many a times one needs an extra telephone ringer in an adjoining room to know if there is an incoming call. For example, if the telephone is installed in the drawing...__ Electronics Projects for You Contactless Telephone Ringer - This fully transistorised, simple circuit designed as a contactless telephone ringer provides an indication of incoming telephone call at a remote site like kitchen or bedroom in the building. it is...__ Electronics Projects for You
How to ring a telephone - People who read my telephone intercom article often ask what's so hard about ringing a telephone bell. The trouble is that you need AC at 20Hz and 40-90VRMS. That's not exactly the sort of AC that's easy to generate. if you do it at low voltage, you need a special transformer to transform it up -- a regular power transformer is no good at 20Hz -- and if you do it at high voltage, you need dangerous supply voltages and high-voltage components __ Designed by Markus Wandel
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Line-Powered Two-Tone Ringer - Need often arises for having an extra telephone ringer in another room to alert you of an incoming call. A low-cost, 2-tone ringer IC LS1240, which is commonly used as part...__ Electronics Projects for You Remote Phone-Bell Ringer - Did you ever miss an important telephone call simply because you were away where you couldn't hear the phone ringing? This should not happen again with this inexpensive remote telephone bell....__ Electronics Projects for You
Remote Telephone Bell Ringer - This remote telephone bell ringer allows you to use a large (and loud) external bell in place or in addition to the built in (and rather wussy) ringer in most modern telephones. This is ideal for large outdoor areas, noisy shops or those hard of hearing. Most any large bell can be used as the circuit can be easily adjusted for various supply voltages. __ Designed by Aaron Cake
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Telephone Ring Generator using Switching Power Supply - The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS
Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TiP47 or other high voltage, 1 amp transistor) and a driver transistor (2N3053). The inductor should have a low DC resistance of 1.5 ohms or less. The switching supply must have a load connected to prevent the voltage from rising too high, so a 22K resistor is __ Designed by Bill Bowden Telephone Ringer - Several design, scroll to find the one. The Phone Ringer circuit will work with any ordinary phone including older bell ringer types. The circuit rings the phone in a completely realistic manner until someone answers. When the receiver is lifted the user hears the audio of your choice. it might be another telephone, a tape recording, a favorite talk radio show, a fake busy-signal, a scanner tuned to weather or police, cues for the actor who forgot his next line, or whatever audio source strikes your fancy. DC current is passed through the phone to activate the phone’s electronics. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Telephone Ringer using Timer ICs - This circuit can produce ringing tones similar to those produced by a telephone for use in intercom operations. __ Electronics Projects for You
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Telephone Ringer Circuits |
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