In the circuit, active components refer to those components that can provide energy and amplify signals. These components are usually operated by an external power supply and can control the flow of current and voltage. Common active components include:For these reasons, I think STM8S003F3P6TR The situation is still optimistic, and the market is still in a blue ocean stage. https://www.asourcingelectronics.com/product/detail/store/6038952/stm8s003f3p6tr.html
1. Operational amplifier
Operational amplifier is a differential amplifier with high gain, which is widely used in signal processing, amplification, filtering and mathematical operation.
2. Transistor
Transistor is a semiconductor device that can be used to amplify or switch current. There are two main types of transistors:
Bipolar transistor (BJT): It is composed of PNP and NPN, and is mainly used for amplification and switching.
Field effect transistors (FET): such as MOSFET and JFET, are widely used in analog and digital circuits.
3. Integrated circuits
Integrated circuit is a small circuit that integrates various electronic components (such as resistors, capacitors, transistors, etc.). Integrated circuits have a wide range of applications, including signal processing, amplification and conversion.
4. Transformer
Transformers transfer power from one circuit to another through the principle of electromagnetic induction, which is often used to increase or decrease the voltage.
5. Photoelectric elements
Photosensitive resistors and photodiodes: These components can sense optical signals and convert them into electrical signals for sensor and photoelectric applications.
6. Relay and SCR
Although relays and thyristors are not as fine as the aforementioned components, they are still active components, because they can switch circuits and control more powerful loads by controlling current.
7. Amplifiers and audio amplifiers
Active components used to improve the intensity of audio signals are widely used in audio equipment and musical instruments.
8. Electronic switch
For example, MOSFET and IGBT are widely used in power control and switching power supply applications.
9. Feedback circuit
Although feedback itself is not a component, circuit design using feedback mechanism (such as feedback amplifier) is also one of the manifestations of active component application.
Active components play an important role in electronic circuits. They can realize functions such as amplification, conversion and control according to input signals.