CN2297823Y - Telephone and facsimile apparatus line protector capable of preventing unauthorised or fraudulent calling - Google Patents

Abstract

The utility model relates to an anti-theft protector for telephone and fax machine lines, composed of a mechanical switch, diodes, triodes, capacitors, resistors, indicating lamps, binding posts, etc. The six-point mechanical switcher is applied; a ringing current circuit, an extracting circuit for comparison voltage, an alternating signal, an alternating bias current and alternating self-locking circuits for extracting the ring current, etc. are additionally arranged in the utility model. The anti-theft protector protects the telephone and fax machine lines from being stolen. The utility model has the advantages of reasonable design, simple structure, convenient operation, high safety and low cost.

Description

Phone, the anti-steal protector of facsimile machine circuit

The utility model belongs to a kind of phone, the anti-steal protector of facsimile machine circuit.

At present; phone, the anti-steal protector of facsimile machine circuit have various; for example patent 94204197.6 telephone sets, facsimile machine anti-usurped, anti-to usurp structures such as protector, patent 95231221.2 phone protectors complicated for anti-eavesdrop protector, 94209917.6 1 kinds of telephone lines of patent; cost is higher; increase customer charge, be not suitable for promoting the use of.

The purpose of this utility model provides a kind of phone, the anti-steal protector of facsimile machine circuit; 6 mechanical switch switches have been used; set up the ringing-current circuit; contrast potential extracts circuit; extract the alternating signal and the alternation bias current of ringing-current; alternation latching circuits etc. are to the polarity protection of phone, the anti-steal of facsimile machine circuit.

The utility model is by mechanical switch; diode; triode; electric capacity; resistance; indicator light; compositions such as binding post; L1; L2 is the outside line binding post; K0 is 6 mechanical switch switches; when consistent with the outside line polarity of voltage; amber light LED1 lights; the operating current of LED1 is limited in about about 2.2MA by R1; the effect of diode D0 is: when outside line is anti-phase with it; protection LED1; diode D1-D4 (IN4004) bridge-type connects; be the polarity protection parts; capacitor C 1 and C2 (4.7MF/160V) form the ringing-current path; triode Q1; Q2; red light LED2 and resistance R 2 are formed anti-phase amplification; voltage stabilizing didoe ZW1 (3V); R3; R4 and C3 form Q3; the Q4 power supply circuits; work as Q1; the Darlington transistor that Q2 forms from the conducting upset for the signal of telecommunication that ends also thus the road provide; when outside line normally moves; direct voltage is 50V; voltage stabilizing didoe ZW2 (12V) is in the puncture conducting state; Q3 from then on road obtains positively biased and saturation conduction; with Q1; the base generating of Q2 presses " lock " in about 0V; make it to end; behind the off-hook; Q4 obtains a contrast voltage from R6; and because of the positively biased saturation conduction of this voltage; thereby with Q1; Q2 " lock " is in cut-off state; with the outside line voltage clamp in about 12V; to guarantee the phone operate as normal; C4 (0.047MF/50V); D5 (IN4148) forms alternating signal extraction and protection and circuit; make alternating signal do not fall " "; when having guaranteed that this machine is called out outside line and this machine of External Call; outside line voltage all is clamped at about 12V; when illegal this machine of phone steal outside line is incorporated in outside line into; because outside line Load Line voltage is reduced to below the 12V immediately; ZW2 is ended immediately; Q3 also ends; the Q3 collector electrode rises to about 3.8-4-3V immediately; Q1; the Darlington transistor that Q2 forms obtains positively biased and conducting; add R2 (100 Ω); make Q1; the collector current amplification of Q2 is bigger; and it is saturated to be in the degree of depth; circuit is clamped down in about 3.8-4.3V; red light LED2 is lighted; the indication outside line has the cracker; ZW1 is selected between the 3-4V; when normally reaching by " lock " in 3.8-4.3V, circuit all can be Q3; Q4 provides operating current; this machine of assurance normally moves; LA; LB is this machine binding post, by R1; the outside line power supply indicating circuit that D0 (IN4044) and LED1 (yellow) form.

The utility model is reasonable in design, simple in structure, and is easy to use, safe and reliable, and cost is low, easily promotes the use of.

Description of drawings:

Fig. 1 is the utility model line map.

Each electric elements all can be bought in the utility model; by connection shown in Figure 1; when phone of illegally incorporating into when any point in the outside line or facsimile machine, red light is bright, and the indication circuit has does not illegally incorporate the person into; this protector schedules circuit " lock " between the 3.8-4.3V immediately; make and illegally do not incorporate the person into and can't work, thereby protected telephone subscriber's legal economic interests, when in the outside line and after parallel operation removes; this protector transfers to normally immediately again, and red light extinguishes.Simultaneously, this machine has added phone off-hook on-hook indication amber light, when on-hook just often, amber light is bright, if when receiver off-book is devoted oneself to work, the amber light deepening.In like manner the user can be according to the amber light light and shade, and phone directly perceived is hung and appropriately denied, does not have or not other people to touch at now other extension set and abuses phone, thereby avoided paying meaningless unjust money, has saved the telephone charges spending.When the user thinks it unnecessary to use phone and uses to other people; can be by stirring polarity reversing switch; artificial manufacturing outside line and this protector polarity are inconsistent; make phone be in off position; this moment, this protector was because of being provided with polar protective circuit; so where no matter the polarity protection switch be in, and all can not damage this protector and phone, this user can be relieved.When the user need use phone, as long as dial polarity reversing switch again, amber light was lighted, and can recover normal operation, used simple.Because designed compatible higher and wiring part, and indicated turnover line symbol, anyone need not study, all can correctly use this protector.

Claims (1)

1; a kind of phone; the facsimile machine circuit is prevented the steal protector; by mechanical switch; diode; triode; electric capacity; resistance; indicator light; compositions such as binding post; L1; L2 is the outside line binding post; K0 is 6 mechanical switch switches; when consistent with the outside line polarity of voltage; amber light LED1 lights; the operating current of LED1 is limited in about about 2.2MA by R1; the effect of diode D0 is: when outside line is anti-phase with it; protection LED1; diode D1-D4 (IN4004) bridge-type connects; be the polarity protection parts; capacitor C 1 and C2 (4.7MF/160V) form the ringing-current path; triode Q1; Q2; red light LED2 and resistance R 2 are formed anti-phase amplification; voltage stabilizing didoe ZW1 (3V); R3; R4 and C3 form Q3; the Q4 power supply circuits; work as Q1; the Darlington transistor that Q2 forms from the conducting upset for the signal of telecommunication that ends also thus the road provide; when outside line normally moves; direct voltage is 50V; voltage stabilizing didoe ZW2 (12V) is in the puncture conducting state; Q3 from then on road obtains positively biased and saturation conduction; with Q1; the base generating of Q2 presses " lock " to make it to end in about 0V+; behind the off-hook; Q4 obtains a contrast voltage from R6; and because of the positively biased saturation conduction of this voltage; thereby with Q1; Q2 " lock " is in cut-off state; with the outside line voltage clamp in about 12V; to guarantee the phone operate as normal; C4 (0.047MF/50V); D5 (IN4148) forms alternating signal extraction and protection and circuit; make alternating signal do not fall " "; when having guaranteed that this machine is called out outside line and this machine of External Call; outside line voltage all is clamped at about 12V; when illegal this machine of phone steal outside line is incorporated in outside line into; because outside line Load Line voltage is reduced to below the 12V immediately; ZW2 is ended immediately; Q3 also ends; the Q3 collector electrode rises to about 3.8-4.3V immediately; Q1; the Darlington transistor that Q2 forms obtains positively biased and conducting; add R2 (100 Ω); make Q1; the collector current amplification of Q2 is bigger; and it is saturated to be in the degree of depth; circuit is clamped down in about 3.8-4.3V; red light LED2 is lighted; the indication outside line has the cracker; ZW1 is selected between the 3--4V; when normally reaching by " lock " in 3.8-4.3V, circuit all can be Q3; Q4 provides operating current; this machine of assurance normally moves; LA; LB is this machine binding post, by R1; the outside line power supply indicating circuit that D0 (IN4044) and LED1 (yellow) form.