Intercom machine. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security devices and object signaling
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The intercom is designed for two-way hands-free communication.
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An intercom was made on one chip of the K237UN2 type and four transistors V1 of the MP39-MP42 type, V2 of the MP35-MP38 type, V3, V4 of the P213-P217 type. In the receive mode, the machine is disconnected from its power source, and the speaker is connected to the line through normally closed contacts K1.2. Another correspondent who has a similar intercom must have the "Transfer" button turned on. In this case, power is supplied to the amplifier, the contacts of the relay K1.2 connect the output of the amplifier to the line, and the contacts K1.1 connect the speaker to the input of the amplifier. The "Call" button puts the amplifier into the mode of generating low-frequency oscillations.
Details. Relay K1 type RES-6; capacitors of the K50-6, MBM type, resistors of the MLT-0,125 - MLT-0,25 type; speaker type 0,1GD-6, bulb H1 at 13,6 V; communication line - telephone wire; power supply - three 3336L batteries connected in series.
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