Answering machine telling the time. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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Currently, "talking" watches in various designs - wrist and desktop - have appeared on the markets and in stores. They can be used as an answering machine that tells the time on departmental and office PBXs.
To install an answering machine, you need a separate telephone line, which will be used only for the purpose of obtaining information about the current time. The subscriber who called the number corresponding to this line hears the voice message of the "speaking" clock.
(click to enlarge)
The diagram of the device is shown in the figure. The ringing signal from the telephone line goes to the diode bridge VD1. A current begins to flow through the LED of the optocoupler U1. The optocoupler transistor opens and the capacitor C3 is discharged through the resistor R3. When a low level appears (below 2/3 of the supply voltage) at pin 2 of the OA1 chip, the timer starts and a high level occurs at its output (pin 3) [1]. Transistor VT1 opens and turns on relay K1. Contacts K1.1 connect resistor R9 to the line, and the call signal stops. Timer DA1 is enabled in single vibrator mode. The pulse duration determines the circuit R5R6R7C4. This duration should be chosen so that there is a pause between the end of the speech message and the disconnection of the resistor R9 from the line.
When a high level appears at the output of the timer, the VD3 diode will close and the capacitor C8 will start charging through the resistor R11. The R11C8 circuit sets a pause before the "answer" of the clock. Then the transistor VT2 will open and shunt the "answer" button on the clock. From the output of the clock, the sound signal is fed to the amplifier, which is assembled on transistors VT3-VT7. It is described in detail in [2]. Through the transformer T1, the signal from the output of the amplifier enters the telephone line.
When the pulse generated by the single vibrator ends, a low level will appear at the DA1 output. As a result, transistors VT1 and VT2 will be closed. Contacts K1.1 will turn off the resistor R9, and the device will return to its original mode. The stabilizer on the elements R14, VD6, VT8 generates the supply voltage for the clock.
Relay K1 - RES64A, passport RS4.569.724. Transformer T1 is used from the telephone set TA-68. Optocoupler U1 can be replaced with AOT126A.
The dynamic head in the electronic "talking" clock must be turned off, and a 51 ohm resistor must be connected instead.
Literature
- Zeldin E. Application of the integrated timer KR1006VI1. - Radio. 1986, No. 9, p. 36, 37. 2. Zhurenkov A. Compact stereo cassette player. - Radio, 1989, No. 8, p. 58-61.
Author: A. Kharchenko, Rybinsk, Yaroslavl region; Publication: N. Bolshakov, rf.atnn.ru
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