Answering machine in telephones with caller ID. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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Intelligent phones with AON "Rus" of various versions have the function of "answering machine", however, for its implementation in most devices, an additional installation of the so-called "voice" board is required. In addition, the installation of the board must be carried out by a specialist, and this is not always feasible. Slightly altering any transistor tape recorder, you can use the "answering machine" function without any intervention in the telephone set. In this case, the recording time depends only on the capacity of the cassette (in the "voice" card, the recording time is calculated in tens of seconds).
The proposed device has a high input impedance and practically does not affect the operation of the telephone line.
An automation board is installed in the tape recorder, assembled according to the scheme shown in the figure.
Zener diode VD1, resistor R1 and transistor VT1 form a telephone line status sensor. When the tube is on-hook, the voltage in the line is 60 V. The zener diode VD1 opens, the transistor VT1 is open, VT2 is closed, relay K1 is de-energized, the power supply circuit of the tape recorder is broken.
When a call is received in the telephone set, the "auto-lift" mode is activated, the voltage in the line drops to 8 ... 10 V. Transistor VT1 closes, VT2 opens, relay K1 is activated and with its contacts K1.1 connects the power circuit of the tape recorder, which is constantly on for recording. The sound signal from the line through the capacitor C1 and the trimmer resistor R5 is fed to the recording input of the tape recorder. In imported tape recorders that do not have input connectors, the signal can be fed in parallel with the built-in microphone. Diodes VD4, VD5 limit the voltage during a call.
In the tape recorder, you need to break the power circuit and turn on the relay contacts in the gap. Additional switch SA1 is designed to listen to records. The HL1 LED indicates the mode of switching on the set-top box.
Author: G.Voronin, N-Tura, Sverdlovsk Region
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