CN2187860Y

CN2187860Y - Telephone controlling lock for long distance and local call

Info

Publication number: CN2187860Y
Application number: CN 94208664
Authority: CN
Inventors: 郑闽航
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-09
Filing date: 1994-04-09
Publication date: 1995-01-18
Anticipated expiration: 2004-04-09

Abstract

The utility model relates to the technical field of a telephone controlling lock for long distance and local calls, comprising a diode bridge, two voltage-stabilizer tubes, a triode, an electrolytic capacitor, a silicon controlled rectifier, two resistors and a switch for controlling locks. The utility model is connected with a telephone in series and then is connected to a line, has the advantages of simple circuit, low cost and good effect, can lock the telephone of pulse dialing and the dialing telephone of double audio frequency, and can prevent illegal users who make use of knocking telephones and hook switches from using the telephone.

Description

Telephone controlling lock for long distance and local call

The utility model relates to that a kind of telephone set is long-distance, the invention of local telephone network control lock.

Phone is popularized rapidly in China as a kind of modern communication tool, but brings some worries thereupon also for installation person; Its topmost problem be exactly uncontrollable other people arbitrarily dial, and cause the growth of telephone charges expenditure; Though there are many utility model patents to improve to some extent in this respect, all exist the circuit complexity, the cost height can't be locked local telephone network, and is invalid to the dual-tone dialing phone, and can't prevent that other people from illegally hanging up phone in the mode of knocking hook switch.

The purpose of this utility model provides that a kind of telephone set is long-distance, the local telephone network control lock, and it can overcome above-mentioned the deficiencies in the prior art part.

The principle of control lock described in the utility model as shown in drawings, it is characterized in that: it comprises a diode bridge circuit D1～D4, and the bridge circuit cathode output end connects the negative pole of voltage-stabiliser tube DW1, the C utmost point of triode BG and the anode of controllable silicon SCR, bridge circuit cathode output end connecting resistance R1, the negative pole of electrochemical capacitor C and the negative electrode of controllable silicon SCR; Resistance R 1 and resistance R 2, the positive pole of electrochemical capacitor C positive pole, voltage-stabiliser tube DW2 joins; The B utmost point of resistance R 2 other ends and triode BG joins, and the positive pole of the negative pole of voltage-stabiliser tube DW2 and voltage-stabiliser tube DW1 joins, and the E utmost point of triode BG connects the control utmost point of controllable silicon SCR; Voltage-stabiliser tube DW1 positive and negative electrode also meets a lock-controlled switch KEY.

Above-mentioned the utility model is characterized in that lock-controlled switch KEY also can be attempted by voltage-stabiliser tube DW2 positive and negative electrode two ends.

The utility model is work like this: when lock-controlled switch KEY is in off state, as do not have bell signal, circuit 48V voltage and be subjected to two voltage-stabiliser tube DW1, DW2 restriction, triode BG not to have base current Ib triode, BG ends, though thereby controllable silicon SCR also not triggering and conducting, phone carry machine but can't constitute the loop, thereby can't hang up.If when lock-controlled switch KEY was in closure state, voltage-stabiliser tube DW1 or DW2 were by short circuit, and another voltage-stabiliser tube DW2 or DW1 are breakdown; Thereby triode BG obtains base current Ib and triggers controllable silicon SCR making it conducting formation loop, and the machine of carrying like this can be hung and take on the telephone.

When lock-controlled switch KEY is in off state, squeeze into if any incoming call, bell signal appears, at this moment the high pressure about circuit 160v punctures voltage-stabiliser tube DW1, DW2 simultaneously, charge, make on the other hand the C of triode BG, the conducting of the E utmost point for capacitor C on the one hand and trigger controllable silicon SCR, thereby make bell signal pass through diode bridge, controllable silicon SCR and phone constitute the loop, make phone ringing; According to the signal standards of dial exchange, ring is the 70V AC signal, send one second and stops two seconds; SCR is triggered when sending bell signal, phone is carried machine and is got final product conducting, stop in the ringing-signal feeding 2 seconds, because the charging of capacitor C, resistance R 1, R2 make triode BG conductings and trigger controllable silicon SCR in 2 seconds, even so just guaranteed at lock-controlled switch KEY when disconnecting, also the purpose that can normally answer.

The utility model is skillfully constructed, and circuit is simple, and the low result of use of cost is good, effective equally to the dual-tone dialing phone, the user only depends on and knocks the phone hook switch as no lock-controlled switch key, also can't hang up phone, and turn-off phone, not influence normally answering of phone.

Accompanying drawing is the circuit theory diagrams of the utility model embodiment.

Among the utility model embodiment, the diode bridge diode is a 1N4000 series, and K switch EY is that mechanical lock regulation, voltage-stabiliser tube DW1, DW2 are 2CW series, and triode BG is the NPN type, control lock in use, a bridge circuit input be connected to circuit two end of incoming cables A, B altogether after phone is connected.

Claims

1, long-distance, the local telephone network control lock of a kind of telephone set is characterized in that it comprises a diode bridge D1～D4; And the bridge circuit cathode output end connects the negative pole of voltage-stabiliser tube DW1, the C utmost point of triode BG and the anode of controllable silicon SCR, bridge circuit cathode output end connecting resistance R1, the negative pole of electrochemical capacitor C and the negative electrode of controllable silicon SCR; The positive pole of resistance R 1 and resistance R 2, electrochemical capacitor C positive pole, voltage-stabiliser tube DW2 joins; The B utmost point of resistance R 2 other ends and triode BG joins, and the positive pole of the negative pole of voltage-stabiliser tube DW2 and voltage-stabiliser tube DW1 joins, and the E utmost point of triode BG connects the controllable silicon SCR control utmost point; Voltage-stabiliser tube DW1 positive and negative electrode also meets a lock-controlled switch KEY.

2, long-distance, the local telephone network control lock of telephone set as claimed in claim 1 is characterized in that described lock-controlled switch KEY also can be attempted by both positive and negative polarity two ends of voltage-stabiliser tube DW2.