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Simple Music-On-Hold for Telephones

Here is a simple circuit for music-on-hold with automatic shut off facility. During telephone conversation if you are reminded of some urgen...

Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important in...

The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone i...

Even though cordless phones have invaded our homes and offices, you don’t always have them at hand, and as their ringtones are usually very ...

This circuit enables automatic switching-on of the tape recorder when the handset is lifted. The tape recorder gets switched off ...

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

This add-on device for telephones can be connected in parallel to the telephone instrument. The circuit provides audio-visual indication of ...

Cordless telephones are very popular nowadays. But they have a major drawback, i.e. they cannot be operated during power failure. Therefore ...

How to Build a Electronic Telephone Ringer. This circuit produces a ringing sound similar to that made by more recent telephones. It consist...

Today telephone has become an integral part of our lives. It is the most widely used communication device in the world. Owing to its immense...

You may have read about cycling NiCad batteries. If not, read a little here ( Red's R/C Battery Clinic ) for an excellent overview. Over...

Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio...

If you are lucky enough to have a big house, a large garden, and small children, this project just might interest you. It’s actually a telep...

A long time ago when telephones were so simple almost nothing could go amiss from an electrical point of view, Telecom operators installed s...