Can you understand these basic module circuits?

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Can you understand these basic module circuits? [Copy link]

Basic module circuits, familiar with circuit principles

Here are some circuit diagrams:

TDA2030 circuit diagram

34063 Circuit Diagram

555 Circuit

TDA2030 circuit diagram

Triode discrete component circuit

Well, after reading the above circuit diagrams, can you understand how each circuit diagram works? If you can understand, then congratulations, you have entered the electronic design, if you still don't understand, please don't lose confidence, next, we will start to learn the basic module circuit.

Part 1: Power Circuit

The 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 voltage) integrated regulators, three-terminal adjustable (positive and negative voltage) integrated regulators, and DC-DC circuits.

Power supply processing block diagram

The function of the rectifier circuit is to transform the AC voltage U1 into a pulsating DC U2. It mainly has half-wave rectification and full-wave rectification modes, which can be performed by a rectifier bridge stack composed of rectifier diodes. Common rectifier diodes include IN4007, IN5148, etc., and bridge stacks include RS210, etc. The function of the filter circuit is to filter out the ripple of the pulsating DC U2 and transform it into U3 with small ripple. Common circuits 2 include RC filtering, KL filtering, ∏-type filtering, etc. The commonly used one is the RC filter circuit.

Centralized rectification

In actual application circuits, in addition to connecting large-capacity filter capacitors between the chip input and output terminals and the ground, it is usually necessary to connect small-capacity ( 0.1F to 10F) capacitors Ci and Co to the ground at the root of the chip lead pins. Ci is used to suppress the chip's self-oscillation, and Co is used to narrow the chip's high-frequency bandwidth and reduce high-frequency noise. The specific values of Ci and Co should vary with the chip's output voltage and the application circuit.

78 series three-terminal regulator basic application circuit

Part II: Operational Amplifier Circuits

Operational amplifiers can generally be divided into general-purpose, precision, low-noise, high-speed, low-voltage and low-power, single-supply, etc. The parameters that indicate the performance of operational amplifiers are: single /dual power supply operating voltage, power supply current, input offset voltage, input offset current, input resistance, conversion rate, differential input resistance, offset current temperature drift, input bias current, bias current temperature drift, differential voltage gain, common-mode voltage gain, unity gain bandwidth, power supply voltage rejection, differential input voltage range, common-mode input voltage range, input noise voltage, input noise current, offset voltage temperature drift, settling time, long-term drift, etc.

Phase input ratio operation circuit

Inverting Input Ratio Summing Circuit

Differential amplifier circuit

Part III: Signal Generation Circuit

In the process of various electronic design and production, it is necessary to generate various waveforms, such as rectangular wave, sine wave, triangle wave, single pulse wave, etc. The generation method mainly uses operational amplifiers or dedicated analog integrated circuits, and with a small number of external components, various types of signal generators can be constructed.

Discrete analog circuits constitute a rectangular wave generating circuit

Self-excited equivalent inductance oscillator

Part 4: Signal Processor

Signal processing circuits mainly use integrated operational amplifiers or dedicated analog integrated circuits, and with a small number of external components, they can form processing circuits with various functions. The main functions include signal amplification, signal filtering, impedance matching, level conversion, nonlinear compensation, current /voltage conversion, voltage/frequency conversion, etc.

Active low-pass filter composed of op amp

Sound alarm circuit

Part 5: Sensors and their application circuits

A sensor is a device or apparatus that can sense (or respond to) a specified measured physical quantity and convert it into a usable signal output according to a certain rule. A sensor usually consists of a sensitive element that directly responds to the measured quantity, a conversion element that produces a usable signal output, and a corresponding electronic circuit.

Basic Application of Hall Sensor

Photoelectric detection circuit

Part 6: Display Circuit

LED (Light Emitting Diode) display is the most commonly used display device composed of light emitting diodes. Digital LED display uses 7 light emitting diodes to display numbers, usually called seven-segment LED display or digital tube. In addition, there is a dot-shaped light emitting diode in the digital tube to display the decimal point.

The internal structure of LED display
LCD reality principle, under the action of external electric field, the liquid crystal rod-shaped molecules with dipole moment of the liquid crystal display device change in arrangement state, so that the light passing through the liquid crystal display device is modulated, thus presenting the display effect of light and dark or transparent and non-transparent. The following introduces the method and procedure of FPGA driving dot matrix character liquid crystal display module (MDLS).

LCD display module circuit block diagram

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okhxyyo

Thank you for sharing

maychang

The first "TDA2030 Circuit Diagram" uses two TDA2030s. This is really a big waste.

The gain of the second-stage TDA2030 is about 3 times, so the first-stage amplification only needs to output a relatively small amplitude. In addition, the input impedance of the second-stage TDA2030 is large enough, so there is no need to use a power amplifier with such a large output current, and an ordinary low-power amplifier can be used.

maychang

The first "TDA2030 Circuit Diagram" has a total voltage gain of about 30 times. The fourth "TDA2030 Circuit Diagram" also has a voltage gain of about 30 times. However, the fourth one only uses one TDA2030, so the circuit is much simpler.