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Telephone related circuit diagrams
April 25, 2010
It is a relatively simple circuit, with which we can have optical and sound clue, when we have telephone ring in the line of telephone. The calls in the line, are changed in pulses of... [more]
April 25, 2010
If we have a lot of parallel telephones on a telephone line, we needed a unit that will have the possibility of showing if somebody of the telephone has raised the earphone. [more]
April 25, 2010
A very simple circuit, that will find application in the case where you have a lot of telephones installed on a telephone line and would want to know if somebody of them is open. Thus... [more]
April 25, 2010
Many times exists the need recording some conversations from a telephone line and this it's relatively easy. [more]
April 14, 2010
It ιs a simple circuit for the noise reject that exists in the telephone line in ADSL connections. It works in PSTN and ISDN lines, and is placed in line and before the telephone appliance. [more]
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