Switch-on signaling device in the mains plug. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Power supply

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Any operating electrical appliance powered by 220 V is a potential source of danger. In case of improper operation, a malfunction or an accident in the mains, it can cause a fire, which in the age of plastic and an abundance of a wide variety of finishing materials can cause enormous damage in a matter of minutes. From time to time, even very attentive and responsible people forget, for example, about the included iron, electric kettle, electric stove, washing machine, electric oven. Radio amateurs are no exception, who can forget about the included soldering iron, charger, measuring device. To reduce the likelihood that the electrical appliance will work unnecessarily for a long time, it is proposed to manufacture a simple signaling device that periodically beeps to remind you that the appliance is plugged in.

Fig. 1

The signaling device circuit is shown in fig. 1. An alternating voltage of 220 V through a quenching capacitor C1 is supplied to the bridge rectifier VD1 - VD4. Capacitor C2 smoothes out the ripple of the rectified voltage, the value of which is limited by the zener diode VD5. The flashing LED HL1 not only signals the inclusion of the device in the network, but also serves as a generator of electrical impulses with a frequency of 1 ... 2.5 Hz. They are fed to the input With a fourteen-bit binary counter DD1. Capacitor C4 eliminates high-frequency voltage ripples on the blinking LED, which could cause meter malfunctions.

One of the meter outputs is connected to a sound signaling unit consisting of a resistor R4. capacitor C5 and a sound emitter with a built-in generator HA1. Diode VD6 limits negative polarity voltage surges to a level that is safe for the emitter.

At the moment when the voltage level at the output of the meter, to which the resistor R4 is connected, becomes high, the emitter beeps for about 1 s. It depends on the capacitance of the capacitor C5 and the current consumed by the applied sound emitter.

The interval between signals depends on the period of flashes of the flashing LED instance used and on which output of the counter the resistor R4 is connected to. Transferring this resistor from one meter output to the next by "weight" will increase or decrease the interval between signals by half.

If the signaling device is supposed to be used in conjunction with an electric coffee maker, iron, boiler and other electrical appliance with a short cycle of operation, then it is advisable to select the signal repetition period in the range of 0,5 ... 2 minutes, and if with an electric soldering iron, electric stove, measuring device - 5 .. . 15 minutes. In the device made by the author, sound signals are repeated approximately every 5 minutes.

Fig. 2

The device is surface-mounted in the mains plug, as shown in fig. 2. If there is no mains plug of suitable size, the signaling device can be mounted inside the electrical appliance it serves or in a separate small plastic case.

Resistor R1 is desirable to use non-flammable R1-7-1. Outwardly, it differs from the usual gray-blue color. Capacitor C1 - K73-17 or K73-24 for 630 V DC or imported, designed for AC voltage 250 ... 275 V. When this capacitor breaks down, resistor R1, burning, breaks the power supply circuit of the signaling device. There are no special requirements for other capacitors and resistors.

Diodes 1N4004 can be replaced by any of the series 1 N4001 - 1 N4007, KD209, KD243, KD247. Instead of the 1N4148 diode, both the diodes mentioned above and KD521, KD522 with any letter index are suitable. It is desirable to take a flashing LED with increased brightness of the glow. In addition to the L-56BSRD-B indicated on the diagram, this is, for example, SB2R6SBECY SB3RG6SCECY.

The signaling device, unmistakably assembled from serviceable parts, does not require adjustment. To save time when checking it, you can temporarily connect the output of the resistor R4, right according to the scheme, to output 7 or 5 of the counter DD1. This will reduce the repetition period of the beeps to a few seconds.

Author: A.Butov, village of Kurba, Yaroslavl region; Publication: radioradar.net

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