The Outline of Analog Circuits Course Project
I. Purpose and Tasks
Analog Circuits Course Project is an important practical teaching link in the course of analog electronic technology, and it is a comprehensive training for the students to learn the analog electronic technology. This training is through the students to independently carry out the design, installation and debugging of one or two topics to complete.
Through the analog circuitry coursework requires students:
1, according to the given technical specifications, from the stability and reliability, ease of use, high performance and price ratio to choose the program, the use of a variety of electronic devices and electronic circuit knowledge, design the corresponding functional circuits.
2, through the review of manuals and literature, to develop students independent analysis of the problem and the ability to solve practical problems.
3. Understand the types and characteristics of commonly used electronic devices, and master the principle of rational selection.
4, learn the installation and debugging skills of electronic circuits, master the testing methods of electronic circuits and understand the design of printed circuit boards, production methods.
5, further familiarize with the use of electronic instruments.
6, learn to write the course design summary report.
7, cultivate students serious work style and rigorous scientific attitude.
Two, content, requirements and arrangements
1, content:
Subject name:
(1) multi-output DC regulated power supply design and production
(2) the design of the waveform generator circuit
(3) high-fidelity audio power amplifier design and production of the meter
(4) function signal generator
(5) design and production of water temperature control system
(6) design and production of audio spectrum column display circuit
2, Requirements:
Under the guidance of the teacher, the students have to complete the design of the subject within the specified time, installation and commissioning and independently complete the summary report.
3, schedule and mode: (four hours as a unit)
Unit 1: centralized lectures, the main content is as follows:
(1) the purpose and requirements of the course design
(2) the teaching process of the course design
(3) the grading standard of the course design
(4) the introduction of the course design topic
(5) Students are free to combine and choose the topics.
Unit 2: Determine the topic, the teacher on the basic requirements of the topic to answer questions. Students discuss and look up information.
Units 3, 4 and 5: Information search, design, EDA simulation.
Students according to the requirements of the topic, independently complete the design of the topic, and can use MULTISIM software on the microcomputer to complete the simulation of the designed circuit.
Unit VI to VIII: Assembly, debugging and report writing.
Unit IX: Finish the finishing touches, inventory of materials and tools. Prepare class setup report.
Final exam: group defense.
3. Venue and Equipment
1. Laboratory Venue: Laboratory Center.
2. Equipment used in the experiment: oscilloscope, function generator, millivoltmeter, multimeter (pointer, digital), DC regulated power supply, experimental box.
Fourth, assessment content and grade evaluation
1, assessment content:
(1) design ability
(2) assembly or soldering debugging
(3) problem solving ability
(4) summary report
(5) attendance, work style and scientific attitude.
2. Assessment of Achievement:
20 marks for correctness, rationality and EDA simulation of design, 40 marks for actual operation, debugging and effect,
20 marks for summary report and 20 marks for oral examination.
Topic 1: Design and Production of Multi-Output DC Regulated Power Supply
I. Design Purpose
1, learn the design method of DC regulated power supply;
2, learn to select transformer, rectifier diode, filter capacitor and integrated regulator to design DC regulated power supply;
3, master the main performance parameters of DC regulated power supply And its test methods;
The main tasks required to complete
(1) design tasks
According to the technical requirements and known conditions, to complete the design of multi-output DC regulated power supply, assembly and commissioning.
(2) Design requirements
① Requirements for the design and production of a multi-output DC regulated power supply, can be converted from 220V/50Hz AC power to a multi-output DC regulated power supply
Output: ± 5V/1A, a set of adjustable positive voltage +3 ~ +18V/1A.
② Selection of circuit solutions, complete the design of the circuit of the identified program. Calculate the circuit component parameters and component selection, and draw the overall circuit schematic, explain the basic principles. (Optional: PSPICE or EWB software to complete the simulation)
③ Installation and debugging and write a course design report in the prescribed format.
Initial conditions:
Optional components: transformer/15W/±12V; a number of rectifier diodes or rectifier bridges, a number of capacitors, resistors, potentiometers; a number of three-terminal integrated voltage regulator according to the
need to select a number of three-terminal integrated voltage regulator; AC power supply 220V, or provide their own components.
Available instruments: oscilloscopes, multimeters,
3, program selection and demonstration
Dc voltage regulator overall functional block diagram shown in Figure 1.
Reference circuit diagram:
Transformer according to the required current to determine the power, available 220V input, output 15V/1A or so. If there is no suitable find a 12V a few watts can also be used
Subject 2 waveform generation circuit design
I. Design objectives
1, master the design of the waveform generation circuit;
2, learn to select the appropriate device to design the waveform generation circuit;
3, familiar with the basic method of non-sinusoidal waveform generation circuit adjustments and testing;
4, improve the application of integrated op-amps and the ability to independently carry out circuit design.
Two, the design requirements and technical specifications
1, technical specifications: the required signal frequency f = 1 kHZ, VOm = 0.2V. The output does not use a voltage regulator diode.
2, design requirements
(1) using integrated op-amps to design a simple square wave generation circuit by themselves, the requirements: f = 1 kHZ, VOm = 0.2V;
(2) the requirements of the schematic diagram, and use Protel to draw the printed circuit board drawings;
(3) according to the design requirements and specifications of the design of the circuit, select the right components and parameters;
(4) to develop a test program and design steps;
(5) to write a summary report of the course design, the requirements of the circuit design process, adjusting the content of the test, methodology, steps, test records and analysis of the results.
Subject III Design and fabrication of high-fidelity audio power amplifier meter
I. Design parameters:
1. Design an audio power amplifier using all or some discrete components.
2. rated output power
3. load impedance .
4. distortion
5. DC regulated power supply required to design the amplifier.
II. Design Requirements:
The requirement is to design and fabricate a high fidelity audio power amplifier with an output power of 10W/8Ω, a frequency response of 20~20KHZ,
an efficiency of >60 ﹪, and small distortion.
Three Design Diagrams
The purpose of an audio amplifier is to reproduce a realistic, efficient and low-distortion input audio signal at the required volume and power level on the sounding output element. The audio frequency range is approximately 20 Hz to 20 kHz, so the amplifier must have a good frequency response in this frequency range. The primary role of the audio power amplifier is to provide power to the load, and it is required that the output power be as high as possible and the efficiency as high as possible. The nonlinear distortion is as small as possible.
Input stage --→ intermediate push stage --→ output stage
Negative feedback line ← -- complementary symmetrical amplifier
Subject IV Function Design and fabrication of signal generator
I. Tasks and requirements
(1) the requirements can produce triangle wave, sine wave, square wave;
(2) the requirements of the function signal generator can realize the frequency adjustable
II. Design purpose
(1) learn to use simple electronic components and chips to produce simple function signal generator circuit, exercise practical hands-on ability;
(2) learn to debug the circuit and analyze the circuit
Three. Technical specifications
Requirements for the design and production of a square wave - triangle wave - sine wave generator, the frequency range of 10 ~ 100HZ, 100HZ ~ 1KHZ, 1 KHZ ~ 10 KHZ; sine wave Upp ≈ 3V, triangle wave Upp ≈ 5V, sine wave Upp ≈ 5V, triangle wave Upp ≈ 5V, sine wave Upp ≈ 5V, triangle wave Upp ≈ 5V. wave Upp≈5V, square wave Upp≈14V, amplitude continuously adjustable, small linear distortion.
Subject V Design and Production of Water Temperature Control System
I. Design requirements
(1) design and production of temperature controllers can be measured and controlled
measurement and control of the temperature range: 10 ° - 60 °
precision: ± 1 °
control object: relay or thyristor
relay or thyristor contact connection: a set of conversion contacts for the utility power 220V, 10A
(2) select the circuit scheme, complete the design of the identified circuit scheme. Calculate the parameters of the circuit components and the original selection, draw the schematic diagram.
(3) Installation and commissioning
II. Design tasks
According to the technical specifications to select the appropriate temperature sensor, select the appropriate thyristor or relay, to complete the design, assembly and commissioning of the water temperature control system.
Three. Specific technical specifications
Room temperature ~ 600C, control accuracy ± 10C, control channel output for bidirectional thyristor or relay, a set of conversion contacts for the mains 220V, 10A.
Topic VI Design and fabrication of the audio spectrum column display circuit
I. Design Tasks
Design and fabrication of the audio spectrum column display circuit. The schematic diagram is as follows:
II. Design Requirements
(1) Music input: 0~1.5Vrms; mono. The input is in the form of parallel connection of Lotus and Q9 holders, Lotus is used for music input and Q9 holder is used for testing. The LEDs of the column display are centrally arranged on a 15cm x 10cm panel. Audio amplifier can be used off-the-shelf active amplifier, the power is greater than 1W.
(2) The production of 5-channel band-pass filter, respectively, corresponding to the center frequency of: 60Hz, 250Hz, 1kHz, 4kHz, 16k (1) Hz; filter Q value of about 1.5.
(3) The bar display uses 10 light-emitting diodes to show the voltage high and low, and 1 to 10 light-emitting Diode lit threshold voltage were: 60mV, 80mV, 110 mV, 160 mV, 220 mV, 320 mV, 440 mV, 630 mV, 890 mV, 1.25V, can be made with op-amps or special integrated circuits. For example, the LM3915 bar indicator IC.