Electronic pulse corrector. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic pulse corrector. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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The electronic impulse corrector was developed to replace the relay impulse corrector, which is part of the control panel, used on decade-step and coordinate exchanges.

80% of the damage on the automatic telephone exchange is connected precisely with the damage to the corrector assembled on the K1-KZ relay (the adjustment is violated). We have 6 PKP racks, 40 sets each. Therefore, there is a lot of damage, and it is very inconvenient to manually adjust.

The electrical circuit diagram of the electronic corrector is shown in the figure. The basis of the circuit is a digital comparator, made on the DD12 chip, which compares the numerical code coming from the outputs DD10, DD11. On cells DD1, DD2, a pulse shaper is assembled, which is a trigger.

The serial device is assembled on a DD15 cell and an R11C4 RC chain. The DD5-DD8 pulse generator generates pulses with a duration of 40 and a pause of 50 ms. In the initial state, at all outputs of the counter DD10, DD11 there is a log. "0", at the output 3 DD12 - log. "1". Log. "1" is also present at the output of the cell DD13, through the capacitor C1 enters the reset input R of the counter DD13. The counter is reset. At the outputs - log. "0", at the output of the element DD4 - log. "1". Log. "1" is also present at the output of DD14, it prohibits the passage of generator pulses.

The subscriber starts dialing. The relay contacts "AND" (SA1) switches the trigger. Pulses from output 3 arrive at the serial device and switch it. The positive potential from the output of DD15 is fed to input 1 DD13. Thanks to the R11C4 RC chain, the log "1" is present all the time while the subscriber is dialing a number. From the output 4 of the trigger DD1, DD2 through DD9 pulses are fed to the counting input of the counter DD10 and switch it. If, for example, the subscriber dials the number "5", the output of the counter DD10 is code 1010. The output of DD12 is log "0". After the end of dialing a number, after a few milliseconds, the serial device switches to its initial state - log "0". At the output of DD13 - log. "0", at the output of DD14 - log. "0". Pulses from the generator enter the register, simultaneously switch the counter DD1 1. As soon as the counter reaches the number "5", code 1010 is set. At the output DD12 - log. "1", resets the counter DD13. At the output of DD14 - log. "1". The generator is closed. Pulses from the electronic corrector are transferred to the register during the inter-series interval, which is 700...800 ms.

Electronic corrector

If the subscriber dials the numbers "7", "8", "9", "0", the inter-serial interval for the transmission of these numbers may not be enough. For this, a node was assembled on a DD3 chip. As soon as the number "7", "8", "9", "0" is written to the counter, a log "12" is set at the outputs 14, 15, 13, 1. At the output of DD4 - log. "0", DD14 - log. "0". The pulses from the generator enter the register. As soon as one of these digits is written to the counter DD11, the comparator will issue a log. "1" and reset the counter to zero, which will close the generator.

The control panel board needs to be modified (the changes correspond to the control panel circuit diagram). The contacts of the impulse relay "AND" 11-12-13 are switched on instead of the switch SA1. Relay contacts K1 are included in the break of the subscriber loop (AV wires of the register). The contacts of the K2 relay are connected to the break in the K2 wire located on the control panel.

The adjustment comes down to setting the duration of the generator pulses (impulse - 40 ms, pause - 50 ms). Instead of fixed resistors, variables are soldered (the author installed a 100 kΩ resistor from the SVP TV). When the duration is set, the variable resistors are replaced by constants of the same rating (having previously measured the resistance). Also set the holding time of the serial device.

Details

Resistors Rl, R2, R10, R14, R15 - 1,1 MΩ; R6, R8, R9, R12, Rl 6-R19 - 10 kOhm; R7 - 200 kOhm, R11 - 100 Yum; R4, R5 - are selected in the process of establishing. Capacitors C1 - 0,3 ... 0,5 uF; C2, C3 - 0,3 uF; C4 - 0,1 ... 0,5 μF, selected experimentally. Diodes - KD102. Transistors VT1, VT2 - KTZ15; VT3 - KT361. Chips DD5-DD8 -K561LA7, 1 housing; DD1, DD2, DD4, DD9 - K561LA7 (or 176), 1 Kopnyc; DD3-561IE16; DD10, DD11 - K561IE10, 1 case; DD12-K561IP2;DD13,DD14-K561LP13, 1 housing; DD15 - K561TL1. RS55B reed switches are used as relays. The relay can be replaced with a KT829 transistor and included in the break of the subscriber loop.

On the stand, the circuit worked perfectly. If it is improved, the author will be very happy.

Author: Yu. Sadikov, Moscow; Publication: radioradar.net

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