Before the article begins, let's test the following five circuit diagrams, how many can you understand?
TDA2030 circuit diagram.
34063 circuit diagram.
555 circuit.
TDA2030 circuit diagram.
Triode discrete component circuit.
If you can understand the above circuit diagrams, you have already started electronic design. If you haven't understood it yet, let's start Xi these basic module circuits.
Power circuits
DC regulated power supply is the energy circuit of electronic equipment, which is related to the stability and reliability of the entire circuit design, and is a very critical link in circuit design. This section focuses on the typical circuit design composed of three-terminal fixed (positive and negative) integrated voltage regulators, three-terminal adjustable (positive and negative) integrated voltage regulators and DC-DC circuits.
Power handling block diagram.
The function of the rectifier circuit is to convert the AC voltage U1 into a pulsating DC U2, which mainly has half-wave rectification and full-wave rectification mode, which can be executed by the rectifier diode to form a rectifier bridge stack, the common rectifier diodes are IN4007, IN5148, etc., and the bridge pile has RS210 and so on. The function of the filter circuit is to filter out the ripple of the pulsating DC U2 and turn it into a small ripple U3, and the common circuit 2 has RC filtering, KL filtering, type filtering, etc., and the commonly used RC filter circuit is selected.
Centralized rectification form.
In the practical application circuit, in addition to connecting the large-capacity filter capacitor between the input and output terminals of the chip and the ground, it is usually necessary to connect the small capacitance (0.) at the root of the chip pin1 F 10 F) capacitance CI, CO to ground. CI is used to suppress the self-oscillation of the chip, and CO is used to narrow the high-frequency bandwidth of the chip and reduce the high-frequency noise. The specific values of CI and CO should vary depending on the output voltage of the chip and the way the circuit is applied.
The 78 Series three-terminal regulator basic application circuitry.
Operational amplifier circuits
Operational amplifiers can generally be divided into general-purpose, precision, low-noise, high-speed, low-voltage and low-power, single-power type, etc. The parameters that indicate the performance of the operational amplifier are: single and dual power supply operating voltage, power supply current, input offset voltage, input offset current, input resistance, slew rate, differential mode input resistance, offset current temperature drift, input bias current, bias current temperature drift, differential mode voltage gain, common mode voltage gain, unit gain bandwidth, power supply voltage suppression, differential mode input voltage range, common mode input voltage range, input noise voltage, input noise current, offset voltage drift, settling time, long-term drift, etc.
Non-inverting input proportional arithmetic circuit.
Inverting input proportional summation circuit.
Differential amplification circuit.
Signal generation circuits
In the process of various electronic design and production, it is necessary to generate various waveforms, such as rectangular waves, sine waves, triangle waves, single pulse waves, etc. The resulting methods mainly use operational amplifiers or application-specific analog integrated circuits, and with a small number of external components, various types of signal generators can be constructed.
Discrete analog circuits form a rectangular wave generation circuit.
Self-excited equivalent inductive oscillator.
Signal processing circuits
The signal processing circuit mainly uses integrated operational amplifiers or special analog integrated circuits, and a small number of external components can form processing circuits for various functions. The main functions include signal amplification, signal filtering, impedance matching, level transformation, nonlinear compensation, current-voltage conversion, voltage-frequency conversion, etc.
An active low-pass filter composed of op amps.
Audible alarm circuit.
Sensors and their application circuits
A sensor is a device or device that can sense (or respond to) a specified measured physical quantity and convert it into a usable signal output according to a certain law. Sensors typically consist of a sensing element that responds directly to the measurement and a conversion element that generates a usable signal output, as well as the corresponding electronic circuitry.
Hall sensors are the basic application.
Photoelectric detection circuit.
Display circuitry
LED (Light Emitting Diode) display is the most commonly used display device composed of light-emitting diodes. Digital LED displays use light-emitting diodes to display numbers, often referred to as seven-segment LED displays, or digital tubes. In addition, there is a dot-type light-emitting diode in the digital tube to display the decimal point.
The internal structure of the LED display.
The principle of LCD reality, under the action of the applied electric field, the liquid crystal rod-like molecules with dipole moment of the liquid crystal display device change in the arrangement state, so that the light through the liquid crystal display device is modulated, so as to present the display effect of light and dark or transparent and opaque. The following describes the method and procedure of FPGA driving dot matrix character liquid crystal display module (MDLS).
Block diagram of the liquid crystal display module circuit.
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