KR920002342Y1 - Telephone system with public telephone function - Google Patents

Abstract

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Description

Payphone system using public telephone line

1 is an embodiment of the present invention.

2 is a layout view of the present invention.

3 is a block diagram of the present invention.

4 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

A: Inbox B: Telephone

1: Coin presence confirmation unit 2: Ring pulse detection unit

3: hook switch detection unit 4: return magnet detection unit

5: Inlet magnet detection part 6: 3-digit number detection part

7: Time passing detection part 8: Minute time and delay part

9: alarm signal unit 10: signal amplifier

11: signal detector 12: 0.5 second delay

13 signal waiting unit 14 reception detection unit

15: Adapter 16: Jack

17: AC power

The present invention relates to a public telephone pay box device using a general telephone line.

In more detail, it is possible to leave a regular telephone line intact and add an auxiliary device having a system of a public telephone type toll box without using power or interruption of CO line power so that the ordinary telephone can be used as a public telephone by switching it. will be.

Since conventional telephones cannot be used as public telephones, public telephones should be installed separately in the case of hospitality or other public offices where public access is frequently made. In most cases, the general telephone is used as a public telephone and the charges are immediately collected.

However, when the charge of the local telephone fee, which is scheduled to take effect from July 1, 1989, is enforced, the fee cannot be countered at the call site. There are many problems in terms of service.

The present invention was devised to solve the above problems, and the subject matter of the present invention is an auxiliary device using AC power without any trouble of CO line power. It is characteristic that it is possible to make a call by turning on a charge when it is turned off.

In more detail, a conventional public telephone of a conventional general line picks up a handset, inserts a predetermined coin, and dials it. Then, when the other party answers the call, the inverting pulse is sent when the other party answers the call. When the other party does not answer the phone due to absence, the coin is returned by pressing the hook switch, but the telephone of the general line does not send the reverse pulse wave as above, so it cannot be used as a public telephone.

When talking about the features of the present invention devised to solve such problems, firstly, the present invention requires a power source separately from the CO line power supply, and all the operations occur in the CO line by connecting the circuit configuration between the CO line and the telephone in series. After switching the second switch, i.e., turning it OFF, the handset must be dialed with the coin specified in the toll lifter to pick up the handset and the signal is sent to the other party. In case of bureau, the standard is 4 seconds. If the signal does not occur even after the 4th signal elapses, it is considered that the other party is busy or absent. At this time, if the user presses the hook switch, the return magnet is activated and the coin is returned. For three-digit service calls, coins will be returned after the call Like the 6th long distance call, more than 8 digits cannot be used, and when the 7th 3 minutes or more is used, the alarm is cut off 9 times every 2 seconds and the 10th is cut off just before 3 minutes (20 seconds ago). If the coin is reinserted before it is broken, it is extended by 3 minutes so that the user is not confused with the function of the general public telephone.

This will be described in detail based on the drawings.

1 is an exemplary view showing an embodiment of the present invention, FIG. 2 is a layout view of the present invention, FIG. 3 is a block diagram which is an essential part of the present invention, and FIG. 4 is a flow chart of the present invention. According to the description in detail as follows.

First, when the AC power source 17 is connected, it is rectified by the adapter 15 and stable power is supplied through the constant voltage IC1-7806 in the circuit.

On the other hand, L ₁ and L ₂ are connected to the trunk line, T ₁ and T ₂ are connected to the telephone B, and the switch SW ₁ is turned off so that no sound is heard.

At this time, if the designated coin is inserted into the inlet of the charge box (A), SW ₁ is turned on, and if DC voltage is applied to the gates of S, C, and R (G ₁ ) through R ₁₆ D ₁ , There is a conduction between the node (ANode) and the cathode (cathode).

In this case, the beeper is heard while operating the lamps (LEDs) of BD ₁ , R ₂ , R ₃ , and IC ₂ .

At this time, when dialing, pulse occurs and the pulse comes out of IC2 and collector side.

Since this pulse is the same condition as pressing the hook switch several times, the return magnet (M ₂ ) should not operate at this time, so the delay time is 0.5 seconds using the time IC of IC ₇ . .

If the hook switch (Hook SW) (3) for, if pressed for more than 0.5 second since the cut off voltage to the lamps (LED) terminal of the IC _2, a comes R ₂₂ and C ₁₃ high (Hi) to the collector (Collector) side of the IC ₂ The output terminal (No. 3) of IC ₂ changes to Low as the delay time (0.5 seconds) by the set number of is released.

As soon as it is delivered to the inverter IC gate of IC _7, the output goes high.

Since the output voltage is high at the AND gate AND ₁ and the coin is turned on, the switch SW ₁ is turned on and the 6V voltage is transferred to the AND gate through R ₆ . The high voltage and the high voltage of the note 1 (NoT ₁ ) output pin become the high voltage at the output side of AND ₂ .

This voltage when passing through the R ₁₄ applied to the base (BAse) side of Q ₅ the collector (Collector) The one line of the coil rows (Low) of the magnet (M ₂₎ to the side, so the magnet (M ₂₎ is operating, and The switch SW ₁ is turned OFF.

At this time, the return magnet (M ₁ ) also stops the operation, but it takes time (0.5 seconds) to return enough here, so that the voltage passing through R ₆ is charged to C ₁₂ and delayed when it is discharged.

Pick up the handset and put the coin goes low (Low) side of the IC ₂ collector (collector).

This voltage is applied to the note ₁ (Not 1), the inverter (invetor IC), the gate (gate) and the output goes high (Hi).

At this time, when dialing, the pulse repeats Low and Hi at the trigger terminal of IC ₈ .

The pulse voltage is delayed within 0.5 seconds while the number and number interval are 0.5 seconds. Therefore, even if any number is pressed or turned (pulse dial), only one pulse is output, so the output voltage is the counter IC (IC ₉ ). It is connected to the clock terminal of and counts how many times the dial is pressed.

If only three digits (eg 114, 112, etc.) are pressed, the number 4 of IC ₉ will be hi.

Since the high Hi is applied to 6 bases through R ₂₅ , the voltage is changed low at the collector side, so that the incoming magnet M ₂ does not operate even if the signal goes.

If the hook switch is pressed while the incoming magnet M ₂ does not operate, the coin is returned.

And if you want to call Seoul or other suburban areas, you must dial the area code, so the overall number counter will increase.

If the 7-digit press the digits number more than comes at a high (Hi) to the counter output terminal of the IC ₁₉ this voltage is D _17, comes to R ₂₀ via a D ₁₉ When the voltage on the base (Base) of TR ₁ TR ₁ YR ₁ is operated and contact point is B contact. Therefore, the circuit is forcibly cut off and the coin is returned as it is the same condition as pressing Hook SW.

The coin is returned when the other party is busy or absent.

In this case, when the signal is not received, when pressing the hook switch (HooK SW) and trying to send a redial, at this time, if there is a residual voltage at the gates of S, C, and R, the redundancy can be obtained without inputting coins. In some cases, when returning, TR ₁ is operated through the output pin of AND ₂ and D ₂₀ to force RY ₁ to stop the operation of S, C, and R.

Insert the next coin and finish dialing.

This signal is induced across R ₂ .

The organic signal is transmitted to T ₁ (negative TRANS) molecular axis 1 through C _19.

The transmission signal is applied to be induced in the second revel C _37, C _38, op M 1 to the operational M 4 (opamp ₁ to opamp ₄₎ via a pulse (Pulse) circuit of the C ₄ and R _60, R ₃₁ in T ₁ do.

The amplified signal appears on the output side and is classified into the signal sensing circuits IC ₁₀ , IC ₁₁ , and IC ₁₂ through C ₂₁ , D ₂₃ , and D ₂₄ .

The IC _10-12 using the IC pull to pass through only a specific frequency (signal) was classified as a 350HZ, 400HZ, 450HZ.

This is because each telephone station has a slightly different beep frequency, so it is classified into three types and has a band of ± 20HZ.

When a signal is detected, any of IC ₁₀ , IC ₁₁ , and IC ₁₂ goes low to the active IC _10-12 output pin.

These outputs have 0.5 second sec delay circuits (D ₂₅ , D ₂₆ , R ₄₈ , R ₄₉ , C ₂₂ , R ₅₅ ) and (D ₂₇ , D ₂₈ , R ₅₀ , R ₅₁ , C ₂₃ , R ₅₆ ) and (D ₂₉ , D ₃₀ , R ₅₂ , R ₅₃ , C ₂₄ , and R ₅₇ ) are applied to the inputs of opem ₂ to opamp ₄ .

Opm ₂ to opamp ₄ are conferator operations. The outputs are combined with D ₃₁ , D ₃₂ , and D ₃₃ and applied to inverter not ₁ and gate. .

In other words, when it is low, the output goes high.

In other words, if one of the Pull IC ₁₀ , IC ₁₁ , IC _12, and delay circuits opamp ₁ to opamp ₄ produces a signal for more than 0.5 seconds, the output of NoT ₁ of R ₅₉ will show (Hi). .

This voltage is supplied to the clock side of IC ₆ via R ₄₇ to stop the operation of IC ₄ (12 sec delay time) and IC ₅ (4 sec delay time). Go to)).

The IC ₇ input gate (gate) of the C ₁₅ side is at a high (Hi) when the output is low (Low) that is (Low) voltage is low is the chongjeon voltage of the above tri-lower (TRiger) terminal and C ₉ D _4, sikimyeo the lock (lock) to the force by the D ₅ high (Hi) when is turned off is delayed.

If no signal is received in 4 seconds, the delay time stops and the output of IC ₅ goes low.

IC ₄ is a wait time (Time) to the signal before coming (that is to end the dialing (Dialing) within 12 seconds and) and the operation of the IC ₄ by the signal sense is therefore automatically stopped by the IC ₆ operates D _3, D The output terminal of ₆ goes low.

If this voltage is low, Q ₃ does not operate. Therefore, when Hi comes out on the collector side, the lead axis AND ₁ is coined, so the high three digits (114) through R ₆ as not to stop the operation of the TR _5, the status of the high (Hi) 3 terminals are all high (Hi) to the collector side (collector) of the TR _5, so the output goes too high (HI).

This high voltage operates TR ₃ through R ₁₂ to operate M ₁ (inlet magnet 5) to introduce coins.

When the coin is pulled in, the switch (SW ₁ ) is naturally turned off and all magnet (M) stops, but S, C, and R are hook switch (Hook SW) even when there is no gate voltage when DC is applied to the ANode side. The operation continues before pressing) or before RY ₁ is activated.

When the hook switch is turned off, the voltage at the R ₁₅ terminal is low, so the gate of NoT ₁ is also low.

At this time, the output is high, so the NAND gate gets high. On the other side, the collector side of IC ₂ is low, so the output pin of IC ₇ becomes high. The output of NAND ₁ goes low, and this voltage releases the reset terminal of IC ₁₄ and the 3-minute timer counter is activated.

The output pin becomes high (Hi) from 2 minutes and 40 seconds, the output pin of AND ₅ becomes high (Hi), and one terminal of AND ₆ is connected to the IC ₁₅ second counter IC output pin. It changes to Hi every two seconds.

This voltage is connected to the reset terminal. When the 200HZ generator is operated and the beeping sound passes through R ₂₃ and is applied to the Q ₇ Base, TR ₆ is activated and transmitted to T ₁ .

This transmitted signal is caught across R ₂ through C ₁₉ , so you hear a beeping sound on the handset.

At this time, if it is left, AND ₃ and AND ₄ operate and pass through D _{21. If} TR ₁ is operated, HRY is operated.

If the specified coin is re-inserted when the beep sounds, the switch (SW ₁ ) is turned on, so the gate of NOT ₁ becomes the high output and the output of the low NAND ₁ becomes high. The 3 minute time counter is reset and restarted from the beginning.

At this time, since IC ₄ and IC ₅ have been delayed, the coins are immediately received.

And when the other party receives a call while the receiver is released, 16HZ and Bell signals are applied to both ends of the trunk line (L ₁ , L ₂ ). Pulse This pulse turns on Neon through C ₅ and R.

At this time, since the 2nd axis cds maintains a low resistance value, the IC ₃ (Timer) is forcibly trimmed.

The interval between the bell signal and the bell signal is fixed as 4 seconds since the mechanical tune is 2 seconds for the battery station.

R ₁₈ passes through the output pin of IC ₃ even before the next bell signal, so S, C, and R are turned on forcibly without a coin.

As described above, the present invention can be used as a general telephone and a public telephone by installing a public telephone toll box on a normal general telephone, without disturbing the power supply of the CO line, which can greatly contribute to convenience of use as well as the elimination of telephone calls. .

Claims (1)

To charge the circuit (L ₁ ) (L ₂ ) of the ordinary telephone line so as not to disturb (A) Attach the auxiliary device of the system to switch as a switch, coin presence check unit (1), ring pulse detection unit (2), Hook switch detector (3), return magnet detector (4), incoming magnet detector (5), 3-digit number detector (6), long distance call detector (7), minute time and delay (8), alarm signal (9) ), The signal amplifier 10, the signal detector 11, the 0.5-second delayed portion 12, the signal standby portion 13, and the reception detector 14 are formed in one substrate and the coin is checked in the coin presence checker (1). A public telephone pay box apparatus using a regular telephone line, which is operated so that the circuit elements are operated simultaneously.