Just a phone. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Just a phone. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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I propose a circuit of a telephone set, which has the following distinctive properties compared to the well-known ones [1]:

- there is no high-voltage separating capacitor in the ringing device, and it is constantly connected to the telephone line loop;
- the use of K1436UN1 microcircuits (similar to MS34119) as microphone and telephone amplifiers made it possible to reduce the number of "strapping" elements of the conversational assembly to a minimum.

This phone allows you to receive a call and have a conversation. It can be used for kitchen, bathroom, etc. It can be placed in the case of a children's toy, in a toothbrush case. If desired, the scheme can be supplemented with a dialer. The ringer chip K 1436AP 1 (analogue of DBL5001/2) is included according to the standard scheme. The only difference is that the VD2 zener diode with a stabilization voltage of 82 V is included in the power circuit of the microcircuit. Thanks to it, the ringing device does not shunt the telephone line when dialing a number and during a conversational connection.

Just a phone

The conversation node is assembled on D2 and D3 chips. Capacitor C3 and resistor R6 - power filter for microphone BM1. C7 - blocking. The load of the D2 chip is the resistor R8. The scheme suppresses the local effect. Its adjustment is made by the resistor R9.

With stable parameters R5, VM1, R7, R8, the resistor R9 can be replaced by two fixed resistors. The signal value for the phone BF1 is set by the resistor R10. Chip D3 is powered by a parametric stabilizer R6-VD5-C5. Capacitor C8 - blocking.

Because of its simplicity and good repeatability, this scheme can be used to improve older telephone sets.

Note. In the diagram, pin 7 of D2 must be connected to pin 6 of D3. Resistor R6 is not included in the parametric stabilizer circuit (as erroneously indicated in the text).

Literature

1. Kizlyuk A.I. Reference book on the device and repair of telephone sets of domestic and foreign production. - M.: Biblion, 1997.

Author: A. Mikhalevich, Minsk, RL 12/98; Publication: N. Bolshakov, rf.atnn.ru

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