CN216957247U

CN216957247U - Be applied to breathing lamp of 555 integrated circuit teaching

Info

Publication number: CN216957247U
Application number: CN202220764752.5U
Authority: CN
Inventors: 邓云; 廖良旺; 黄海程
Original assignee: Guangxi Vocational and Technical College
Current assignee: Guangxi Vocational and Technical College
Priority date: 2022-04-05
Filing date: 2022-04-05
Publication date: 2022-07-12
Anticipated expiration: 2032-04-05

Abstract

The utility model provides a breathing lamp applied to 555 integrated circuit teaching, wherein a circuit of the breathing lamp mainly comprises a 555 integrated circuit, a light emitting diode, a resistor, a capacitor and a field effect tube, and on the basis of an oscillating circuit formed by the 555 integrated circuit, the output current of the field effect tube is controlled by charging and discharging the voltage which is alternately increased and decreased by the capacitor, so that the brightness of an LED lamp is alternately lightened and darkened, and the breathing lamp effect is further realized. The circuit is used for demonstrating the output characteristics of the oscillating circuit consisting of the 555 integrated circuit, so that the original tedious 555 integrated circuit verification experiment becomes more interesting, and the interest of students in participating in the experiment is improved, thereby improving the experiment teaching quality and enabling the students to better understand and master the application of the 555 integrated circuit.

Description

Be applied to breathing lamp of 555 integrated circuit teaching

Technical Field

The utility model relates to a breathing lamp applied to 555 integrated circuit teaching, and belongs to the technical field of electronics.

Background

In the course teaching of the electronic technology major, an independent oscillating circuit experiment is carried out on the 555 integrated circuit in a common teaching method, an experimental result needs to be observed by an oscilloscope, and due to the fact that a single oscillating function circuit of the 555 integrated circuit lacks interestingness, the learning interest of students is not enough, and the teaching effect is influenced. Therefore, an experimental circuit with functionality and interestingness is needed to be designed, on the basis that the 555 integrated circuit forms an oscillating circuit, the output current of the field effect transistor is controlled through the voltage which is continuously increased or decreased by the charge-discharge capacitor, the LED lamp is driven to achieve the breathing lamp effect, original boring verification experiments become interesting, the learning enthusiasm of students is fully mobilized, and therefore the experimental teaching effect is improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a breathing lamp applied to 555 integrated circuit teaching, and a light emitting diode of the circuit can simulate the breathing state of a person to realize gradual on-off, so as to demonstrate the characteristics and the working principle of the 555 integrated circuit.

The utility model adopts the following specific technical scheme:

the utility model provides a be applied to breathing lamp of 555 integrated circuit teaching which characterized by: the circuit of the breathing lamp comprises a 555 integrated circuit U1, resistors R1-R2, a capacitor C1, a light emitting diode LED1 and a field effect transistor Q1, wherein the 4 th pin and the 8 th pin of the 555 integrated circuit are connected with a +5V power supply, the 2 nd pin and the 6 th pin are connected with one end of the resistor R1, the grid of the field effect transistor Q1 and the anode of the capacitor C1, the 3 rd pin is connected with the other end of the resistor R1, and the 1 st pin and the cathode of the capacitor C1 are grounded; the drain electrode of the field effect transistor Q1 is connected with the negative electrode of the light emitting diode LED1, the source electrode is grounded, the positive electrode of the light emitting diode LED1 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a +5V power supply; the field effect transistor Q1 employs BS 170.

The utility model has the beneficial effects that: 555 integrated circuit U1, resistance R1 and electric capacity C1 constitute multivibrator, oscillation frequency is about 2Hz, the incessant voltage that rises or descend is got to control field effect transistor Q1's drain current size through charge and discharge electric capacity C1, and then drive LED1 lamp and realize the breathing lamp effect, be applied to the experimental teaching of electron technology course, can mobilize the enthusiasm that the student participated in the experimental teaching, improve the teaching effect.

Drawings

Fig. 1 is a circuit diagram of the present invention.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1, a breathing lamp applied to 555 integrated circuit teaching is characterized in that: the circuit of the breathing lamp comprises a 555 integrated circuit U1, resistors R1-R2, a capacitor C1, a light emitting diode LED1 and a field effect transistor Q1, wherein the 4 th pin and the 8 th pin of the 555 integrated circuit are connected with a +5V power supply, the 2 nd pin and the 6 th pin are connected with one end of the resistor R1, the grid of the field effect transistor Q1 and the anode of the capacitor C1, the 3 rd pin is connected with the other end of the resistor R1, and the 1 st pin and the cathode of the capacitor C1 are grounded; the drain electrode of the field effect transistor Q1 is connected with the negative electrode of the light emitting diode LED1, the source electrode is grounded, the positive electrode of the light emitting diode LED1 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a +5V power supply; the field effect transistor Q1 employs BS 170.

The working principle of the breathing lamp is as follows: a 555 integrated circuit U1, a resistor R1 and a capacitor C1 form a multivibrator, and the oscillation frequency is about 2 Hz; when the 3 rd pin of the 555 integrated circuit U1 outputs a high level, the capacitor C1 is charged through the resistor R1 until the voltage of the capacitor C1 reaches two thirds of the power supply voltage, the 3 rd pin of the 555 integrated circuit U1 outputs a low level, the capacitor C1 starts to discharge through the resistor R1 until the voltage of the capacitor C1 is reduced to one third of the power supply voltage, the 3 rd pin of the 555 integrated circuit U1 outputs a high level, and the process forms oscillation repeatedly. Because the capacitor C1 works in a charging and discharging state, the voltages at the two ends of the capacitor C1 are in an alternate process of uninterrupted rising or falling, the voltage at the two ends of the capacitor C1 controls the grid of the field effect transistor Q1, the magnitude of the drain current is controlled by the grid voltage, the rising of the voltage at the two ends of the capacitor C1 causes the drain current of the field effect transistor Q1 to increase, the light emitting diode LED1 gradually brightens, the falling of the voltage at the two ends of the capacitor C1 causes the drain current of the field effect transistor Q1 to decrease, and the light emitting diode LED1 gradually darkens, so that the effect of the breathing lamp is achieved.

Claims

1. The utility model provides a be applied to breathing lamp of 555 integrated circuit teaching which characterized by: the circuit of the breathing lamp comprises a 555 integrated circuit U1, resistors R1-R2, a capacitor C1, a light emitting diode LED1 and a field effect transistor Q1, wherein the 4 th pin and the 8 th pin of the 555 integrated circuit are connected with a +5V power supply, the 2 nd pin and the 6 th pin are connected with one end of the resistor R1, the grid of the field effect transistor Q1 and the anode of the capacitor C1, the 3 rd pin is connected with the other end of the resistor R1, and the 1 st pin and the cathode of the capacitor C1 are grounded; the drain electrode of the field effect transistor Q1 is connected with the negative electrode of the light emitting diode LED1, the source electrode is grounded, the positive electrode of the light emitting diode LED1 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with a +5V power supply.

2. A breath lamp applied to 555 ic teaching as claimed in claim 1, wherein: the field effect transistor Q1 employs BS 170.