Phone call indicator light. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Telephony

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The proposed signaling device (Fig. 1) smoothly lights the EL1 incandescent lamp when a ringing signal arrives and smoothly extinguishes it at the end. The signaling device does not respond to dialing and other impulse noise that may be in the telephone line. In order not to complicate the circuit, a specialized KR1182PM1 microcircuit was used, designed to work in phase power controllers. This microcircuit allows you to control incandescent lamps with a power of up to 150 W and can withstand an effective voltage value of up to 280 V without damage.

Rice. 1. Schematic diagram of a telephone call signaling light

The pulse voltage of the ringing signal with a frequency of 13 ... 50 Hz and an amplitude of 80 ... 200 V through protective resistors R1, R2 and separating capacitors C1, C2 is fed to the rectifier bridge VD1. The rectified voltage pulses are smoothed out by the capacitor C3, while the HL1 LED is lit. The inclusion of current-limiting resistors R1, R2 in both wires of the telephone line helps prevent damage to subscriber telephone devices and PBX equipment in the event of an insulation breakdown of the VU1 optocoupler, the probability of which cannot be completely ruled out.

With a sufficiently large amplitude of the input signal, the phototransistor of the VU1 optocoupler opens. In this case, the gate-source circuit of the n-channel field-effect transistor VT2 is shunted, and it closes. Capacitor C8 is smoothly charged to a voltage of 2 ... 4 V from the internal current source of the DA1 microcircuit. At this time, the load lamp EL1 lights up smoothly. The power supplied to the load depends on the voltage difference at pins 3 and 6 of DA1. At the end of the call or during pauses between calls, the capacitor C3 is discharged, the current through the optocoupler LED stops, the phototransistor closes, the transistor VT2 opens and discharges the capacitor C8 through the resistor R8, the lamp EL1 goes out smoothly.

Transistor VT1 works as a micropower zener diode with a stabilization voltage of 6 ... 10 V. Varistor R10 prevents damage to the microcircuit during powerful impulse noise in the lighting network or with a significant emergency increase in supply voltage. The two-chip LED HL2 signals the presence of a supply voltage of 220 V. Elements R3, C4, L1, C7, L2 reduce the level of interference that can penetrate the lighting network when the signaling device is operating.

Rice. 2. Pinout of transistors and current switches

In the device, you can use fixed resistors C1-4, C2-23, MLT of the appropriate power. Trimmer resistor - type SPZ-386, RP1-63 or imported small-sized. Varistor - type FNR-20K431, FNR-10K431, FNR-20K39 or semiconductor voltage limiter KS904AC. Oxide capacitors - type K50-35, K50-24, K53-19, K53-4 or imported, for example, from Rubycon, DON. Capacitors C1, C2, C4, C11 - film, type K73-17, K73-24v, K73-39, for an operating voltage of at least 400 V; C7 - ceramic K15-5; C9, SU can be of any type, including oxide ones. To ensure earlier opening of the thyristor keys of the microcircuit, the capacitance of these capacitors is halved. Diode bridge VD1 can be replaced with KTs422V...G, DB102...DB107, RW152...RW157. Diode VD2 - any of the series KD209, KD102, KD105 A ... G, KD243G ... Zh, as well as 1 N4004 ... 1 N4007. LED L1543SRC/E high brightness red glow can be replaced by any similar, for example, series L1503S, L1513S, L383S, KIPD21, KIPD40, KIPD66.

We can replace the double-crystal HL2 with any of the L117, L57, L937, KIPD23, KIPD41 series. The AOT128A optocoupler, which has a galvanic isolation voltage of 1500 V, can be replaced with 4N35, 4N26, TIL111. Transistor VT1 can be installed with any of the KT315, KT312, KT342 series, or a micropower zener diode 2S182Ts, 2S191Ts, 2S210Ts can be used in its place. The field-effect n-channel transistor of the enriched type VT2 can be replaced with KP501B, KP501V, VN2120, ZVN2120 or current switches K1014KT1, KR1014KT1, KR1064KT1. Their pinout is shown in Fig. 2. Inductors L1, L2 can be made on M2000NM-A ring ferrite magnetic cores with an outer ring diameter of at least 24 mm. The windings contain 90 turns of wire PEV-2 00,37 mm. Ferrite rings before winding are pre-wrapped with varnished cloth or fluoroplastic film. Finished chokes are impregnated with varnish or compound. The device is mounted on a printed circuit board with dimensions of 100x75 mm made of one-sided foil fiberglass (Fig. 3). The setting comes down to setting such a resistance of the tuning resistor R5 so that the lamp lights up only when a ringing signal is received.

Rice. 3. PCB

Since the device is galvanically connected to the voltage of the lighting network, when setting up and operating it, it is necessary to observe the safety measures taken in such cases.

Literature

1. S.Dubovoy, A.Sokolov. Phone call indicator light. - Radio, 2001, N6, p.59.
2. S. Oak. A lamp instead of a bell. - Radioamator, 2002, N1, p.55.
3. Y.Prokoptsev. Light repeater phone call. - Radio, 1993, N12, S.22.
4. A. Butov. Light indicator of phone calls. - Radio, 2003, N9, p.40.
5. A. Butov. Call indicator with ultra-bright LEDs. - Radioamator, 2003, N6, S.57.
6. A. Nemich. Chip KR1182PM1 - phase power regulator. - Radio, 1999, N7, p.44.
7. I. Koltsov. Microcircuit of the phase power regulator KR1182PM1. - Circuitry, 2001, N10, p.51.
8. A. Butov. Temperature controller on the chip KR1182PM1.- Circuitry, 2002, N10, S.ZZ.
9. A. Butov. Simple timer. - Radiomir, 2003, N5, p.18.

Author: A. Butov, butoff@yandex.ru, p. Kurba, Yaroslavl region; Publication: radioradar.net

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