Parallel phone blocker. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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Chip KR1059KN2 is an electronic switch of two parallel telephones. The schematic diagram of the phone blocker is shown in the figure.
His work is carried out as follows. If you pick up the handset on TA1, then the thyristor in the IC will open and the phone will connect to the line. The voltage drop across the thyristor of the microcircuit is no more than 2 V. At the same time, the thyristor IS is locked in the circuit of the second TA, which allows it to be turned off for a while until the tube on TA1 is lowered.
If at the time of the release of the first TA. the handset of the second will be removed, then the devices will be switched to the line. The current consumption of the TA from the line with the handset down should be no more than 0,4 mA, otherwise the thyristors of the microcircuit will not close after the end of the conversation. During dialing on one of the devices at the moment of the line loop break, this phone is briefly disconnected from the line. So that picking up the handset of one SLT at this time interval does not cause re-switching of phones, capacitors C2 and C3 are included in the control circuit, which form a delay in switching phones. Their capacitance can be in the range of 5-10 microfarads.
LEDs VD1 and VD2 are designed to indicate the TA, which is in conversational mode.
When a call is received from the PBX (70-90 V), both telephone sets ring.
Publication: cxem.net
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