CN202110616U - doorbell control circuit - Google Patents

Abstract

A doorbell control circuit comprises a start button, a system power supply, a delay circuit, a relay control circuit, a music circuit, a speaker and an indicator light. Since all conventional doorbell circuits use batteries as power supplies, while convenience is brought to people, money is wasted, and the environment is not protected. The doorbell control circuit uses mains supply for power supply, the start button is connected in parallel with the normally opened contact of a relay, and is then connected in series with the power input end and the power output end, the power output end is connected with the system power supply, the voltage of which is reduced by a transformer and which is rectified and filtered by the transformer, the system power supply is connected with the delay circuit, the relay control circuit and the music circuit, the output end of the music circuit is connected with the speaker, the delay switch-off circuit is used for controlling the operation of the music circuit, and after the whole circuit is started, the power supply is switched off after delay. The doorbell control circuit is simple, the cost is low, and the doorbell control circuit is economic, practical, safe, rememberable and energy-saving, and does not use or uses less batteries so as to be favorable for environmental protection.

Description

doorbell control circuit

Technical field:

The utility model belongs to the field of electronic products and relates to a doorbell control circuit. the

Background technique:

Most of the current doorbell circuits use batteries as the power source. Calculated by using three pairs of batteries per year, the cost is 12 yuan, and it will cost more than 100 yuan in ten years. While bringing convenience to people, it is not only a waste of money, but also not conducive to environmental protection. the

Invention content:

The purpose of the utility model is to provide a doorbell control circuit, which is powered by commercial power, and uses a delay shutdown circuit to control the work of the music circuit. After the whole circuit is started, the power supply is delayed and cut off. the

The utility model is realized through the following technical solutions: the doorbell control circuit is characterized in that: it is composed of a start button, a system power supply, a delay circuit, a relay control circuit, a music circuit, a horn, and an indicator light. the

The start button AN1 is connected in parallel with the normally open contact JK1 of the relay, and then connected in series to the input and output terminals of the power supply. Relay control circuit ⑤; the positive pole of the system power supply is connected to the negative pole of the system power supply through the resistor R1 and the light-emitting diode TD1; the emitter pole of the relay control transistor Q1 is connected to the positive pole of the system power supply, and the collector electrode of the relay control transistor Q1 is connected to the system power supply terminal through the relay coil Negative pole; the positive pole of the system power supply is connected to the base pole of the relay control transistor Q1 through the capacitor C3, and the base pole of the relay control transistor Q1 is connected to the negative pole of the system power supply through a series connection resistor R2 and delay capacitor C2; the positive pole of the delay capacitor C2 is connected to the negative pole of the system power supply through a diode D5 is connected to the positive pole of the system power supply; the system power supply is connected to the music circuit after step-down filtering and stabilization, and the output terminal of the music circuit is connected to the speaker. the

The working process of the circuit is: when the start button AN1 is pressed, the power is turned on and the relay is closed. The music circuit works. The system power supplies the emitter, base, and resistor R2 of the triode Q1 through the relay control, and charges the capacitor C2 for a delay. Release, all power is turned off. The doorbell music stops. Capacitor C3 is designed to prevent the relay from shaking and to release the relay decisively. After the power is turned off, the charging voltage of the delay capacitor C2 is discharged through the diode D5, the resistor R1, and the light-emitting diode TD1 to prepare for the restart of the circuit; the music circuit is controlled by the delay turn-off circuit, and the whole circuit is delayed after startup. Turn off the power. the

The beneficial effect is: the doorbell control circuit is simple, low in cost, economical, practical, safe, memorizing, energy-saving, does not use batteries, uses less batteries, and is beneficial to environmental protection. the

Description of drawings:

Figure 1 is a composition diagram. the

Figure 2 is a circuit diagram. Among them: start button ①, system power ②, music circuit and speaker ③, delay circuit ④, relay control circuit ⑤, IC1 is the music circuit. the

Detailed ways:

The doorbell control circuit, as shown in Figure 1 and Figure 2, consists of a start button, a system power supply, a delay circuit, a relay control circuit, a music circuit, a speaker, and an indicator light. the

T1 is a transformer with a power not less than 4W, and the secondary voltage is 6-12V, which is used for the delay circuit, relay control circuit and music circuit. J1 is a relay, the two ends of its normally open contact and the two ends of the AN1 start switch, start to pull and maintain conduction, AN1 is a start button, and uses a self-resetting switch. The delay control part can be made in a dry and ventilated dark box, and the wiring protection, moisture and leakage protection are done well, and the unified design and configuration is the most suitable for house decoration. Music circuit and power supply are selected according to needs. the

When the start button AN1 is pressed, the power is turned on, the relay pulls in, the system power supply charges the capacitor C2 through the resistors R1 and R2 for a delay, the positive potential of the capacitor C2 gradually rises, and the relay controls the base potential of the transistor Q1 to rise. The relay controls the transistor Q1 to cut off, the relay is released, and the power supply is all turned off. The doorbell music stops. Capacitor C3 is designed to prevent the relay from shaking and to release the relay decisively. After the power is turned off, the charging voltage of the delay capacitor C2 is discharged through the diode D5, the resistor R3, and the light-emitting diode TD1 to prepare for restarting the circuit. The diode D5 provides a faster discharge path for the charging voltage of the capacitor C2. After the whole circuit power is turned on, it will be turned off with a delay. The resistor R1, the resistor R2 and the capacitor C2 are the adjustment components of the charging delay time. the

The doorbell control circuit is simple in circuit, low in cost, economical and practical, safe, easy to remember, energy-saving, does not need batteries, uses less batteries, and is beneficial to environmental protection. the

Claims (1)

1. doorbell control circuit is characterized in that: by starting button, system power supply, delay circuit, control relay circuit, music circuit and loudspeaker, pilot lamp composition; The normally opened contact JK1 that starts button AN1 and relay also connects, and is serially connected with the power supply input/output terminal again, and the system power supply that power output end connects the filtering of transformer step-down rectifier 2.; System power supply is connected in music circuit and 3. 4. reaches control relay circuit 5. with delay circuit; The positive pole of system power supply is through the negative pole of resistance R 1, light emitting diode TD1 welding system power supply; The positive pole of the emitter welding system power supply of relay control triode Q1, the collector of relay control triode Q1 is through the negative pole of relay coil terminating systems power supply; The positive pole of system power supply is succeeded the base stage of electrical equipment control triode Q1 through capacitor C 3, and the base stage of relay control triode Q1 is through series resistor R2, the delay capacitor C2 negative pole to system power supply; The positive terminal of delay capacitor C2 is through the positive pole of diode D5 welding system power supply; System power supply is the happy circuit of liaison behind the step-down filtering voltage regulation, music circuit output termination loudspeaker.

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