How many of the five circuit diagrams below can you understand?
TDA2030 Circuit Diagram
34063 Circuit Diagram
555 Circuit
TDA2030 Circuit Diagram
Transistor Discrete Component Circuit
Now that you have looked at these circuit diagrams, can you understand how each circuit operates? If you can, congratulations, you have entered the world of electronic design. If you still don’t understand, don’t lose confidence; next, we will start learning about basic module circuits.
01.Power Supply Circuit
A DC voltage regulator is the power supply circuit for electronic devices, which is crucial for the stability and reliability of the entire circuit design. This section focuses on typical circuit designs composed of three-terminal fixed (positive and negative voltage) integrated voltage regulators, three-terminal adjustable (positive and negative voltage) integrated voltage regulators, and DC-DC circuits.
Power Processing Block Diagram
The function of the rectifier circuit is to convert the AC voltage U1 into pulsating DC U2. It mainly includes half-wave and full-wave rectification, which can be executed by a rectifier diode forming a rectifier bridge. Common rectifier diodes include IN4007, IN5148, etc., and bridge stacks include RS210, etc. The function of the filter circuit is to remove the ripple from the pulsating DC U2, transforming it into a smoother DC U3. Common filtering circuits include RC filtering, KL filtering, and π-type filtering, with RC filtering being the most commonly used.
Centralized Rectification Form
In practical application circuits, in addition to connecting large-capacity filter capacitors between the chip’s input and output terminals and ground, it is usually necessary to connect small capacitors (0.1µF to 10µF) Ci and Co to ground at the root of the chip’s lead. Ci is used to suppress the chip’s self-oscillation, while 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 according to the chip’s output voltage and the application circuit.
Basic Application Circuit of 78 Series Three-Terminal Voltage Regulator
02.Operational Amplifier Circuit
Operational amplifiers can generally be classified into several types: general-purpose, precision, low-noise, high-speed, low-voltage low-power, and single-supply types.The parameters that represent the performance of operational amplifiers include:single/double power supply operating voltage, 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.
Non-Inverting Input Proportional Operational Circuit
Inverting Input Proportional Summing Circuit
Differential Amplifier Circuit
03.Signal Generation Circuit
In various electronic design processes, it is necessary to generate various waveforms, such as square waves, sine waves, triangular waves, and single pulse waves.The generation methods mainly utilize operational amplifiers or dedicated analog integrated circuits, along with a small number of external components to form various types of signal generators.
Discrete Analog Circuit for Generating Square Waves
Self-Oscillating Equivalent Inductor Oscillator
04.Signal Processing Circuit
Signal processing circuits mainly utilize integrated operational amplifiers or dedicated analog integrated circuits, along with a small number of external components to form various functional processing circuits.Main functions include signal amplification, signal filtering, impedance matching, level shifting, nonlinear compensation, current/voltage conversion, voltage/frequency conversion, etc.
Active Low-Pass Filter Composed of Operational Amplifiers
Sound Alarm Circuit
05.Sensors and Their Application Circuits
Sensors are devices that can sense (or respond to) specified physical quantities and convert them into usable signals according to certain rules.Sensors typically consist of sensitive elements that directly respond to the measured quantity, conversion elements that generate usable signal outputs, and corresponding electronic circuits.
Basic Application of Hall Sensors
Photoelectric Detection Circuit
06.Display Circuits
LED (Light Emitting Diode) displays are the most commonly used display devices made up of light-emitting diodes.Digital LED displays use seven light-emitting diodes to display numbers, commonly referred to as seven-segment LED displays or digital tubes.Additionally, there is a dot-type light-emitting diode in the digital tube used to display the decimal point.
Internal Structure of LED Display
The principle of LCD display is that under the action of an external electric field, the liquid crystal molecules with dipole moments change their arrangement state, modulating the light passing through the liquid crystal display device, thus presenting a display effect of light and dark or transparent and opaque. Below, we introduce the method and program for driving a dot matrix character LCD module (MDLS) with FPGA.
Block Diagram of LCD Display Module Circuit
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