Telephone Related
-
Phone Ring Repeater Schematic Circuit Diagram
Even though cordless phones have invaded our homes and offices, you don’t always have them at hand, and as their…
Read More » -
Telephone Ringer Schematic Circuit Diagram
If you are lucky enough to have a big house, a large garden, and small children, this project just might…
Read More » -
Telephone Line Indicator Schematic Circuit Diagram
Many ‘busy’ indicators for use in telephone systems present undesirable loading of the telephone line. Some circuits are very simple…
Read More » -
Telephone Line Watchdog Schematic Circuit Diagram
Circuits have been published on earlier occasions that keep an eye on the telephone line. This simple circuit does it…
Read More » -
8-channel DTMF Link: Encoder Schematic Circuit Diagram
Generated millions of times every day by our telephone keypads, the eight DTMF frequencies were chosen so that the harmonics…
Read More » -
Wire Tracer (Transmitter) Schematic Circuit Diagram
Wire tracers are specifically designed to aid in locating energized and de-energized wires, cables, and pipes whether underground or hidden…
Read More » -
Telephone monitor
It is sometimes necessary to make a telephone conversation audible to more than one person at either end or to make…
Read More » -
Privacy phone
Undesired listening to phone conversations may be prevented by the present circuit, which requires only two components to protect a…
Read More » -
Telephone-operated night light
Since in some countries, it may be illegal to connect the circuit to the public telephone network, to check with…
Read More » -
Telephone monitor
The modern telephone can easily be connected in parallel, enabling a household to have one in the bedroom, kitchen and…
Read More »
