Intercom with automatic call. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Intercom with automatic call. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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Previously, an intercom [1] was described that provides telephone communication between two subscribers using conventional telephone sets. The disadvantage of the device is the need to use additional buttons to make a call.
Calling in the intercom can be automated using the diagram shown in Fig. 1.

Intercom with automatic call. Intercom scheme

When one of the subscribers, for example TA1 (TA2), picks up the phone, the relay K1 (K2) is energized. The relay is activated, and through the contacts Kl.1 (K2.1), Kl.3 (K2.2) and normally closed contacts K2.3 (K1.2) of the relay K2 (K1), a voltage of ~ 80 V is supplied to the bell of the TA2 device ( TA1). Subscriber TA2 (TA1) picks up the phone. Relay K2 (K1) is activated, contacts K2.3 (K1.2) open, the call is terminated. Contacts K2.1 (Kl.1) are closed, a conversational circuit is formed. The power supply of the microphones of the devices does not have a shunting effect due to the high inductive resistance of the windings of the relays K1 and K2 to conversational currents.

Parameters of transformer T1: core Ш16Х45. Winding I contains 1320 turns of wire PEV-2 0-0,23. Winding II-500 turns of wire PEV-2 0-0,12. Winding III-110 turns of wire PEV-2 0-0,35. Relays Kl, K2 type RES22, passport RF4.500.131 are used. Capacitors C1, C2-type MBGO for an operating voltage of at least 160 V. Capacitor C3-oxide K50-6.

Details. Relay Kl-type RES-9, passport RS4.524.200. Thermistor K4-type KMT1, KMT2. Neon lamps TN-0,2-1 were used. Transformer T1 - for voltage 220 V / 27 V, the secondary winding is designed for a current of 200 ... 300 mA.

Literature

Evseev A. Intercom. - VRL, N96 p.30 - 32.

Author: N. Rodichev; Publication: cxem.net

See other articles Section Telephony.

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