**First, the Introduction of Hot Air Gun** A hot air gun is a versatile tool commonly used for soldering, desoldering, and removing components from circuit boards. It works by blowing heated air generated from a heating resistor wire. The control circuit of a hot air gun typically includes several key components: a temperature signal amplification circuit, a comparison circuit, a thyristor control circuit, sensors, and a wind control circuit. These circuits work together to regulate the temperature and airflow efficiently. To enhance the overall performance of the device, additional auxiliary circuits are often included. For example, a temperature display circuit allows users to monitor the actual temperature during operation, making it easier to adjust settings manually. A shutdown delay circuit ensures that the unit cools down properly after use, while a zero-crossing detection circuit helps in controlling the power supply more effectively. These features contribute to the reliability and safety of the hot air gun.

**Second, the Types of Hot Air Guns** There are various types of hot air guns available on the market, each suited for different applications. - **Normal Type**: This basic model is usually priced around $300. However, it suffers from unstable temperature and airflow, which can lead to overheating if not carefully monitored. It only adjusts power, so the temperature rises quickly and may damage sensitive components like CPUs or circuit boards. Although it has a temperature sensor, it's mainly for over-temperature protection rather than precise control. It's not recommended unless you're looking for a budget option. - **Standard Type**: Priced around $500–$600, this type offers better temperature control and faster heating. It can reach desired temperatures in seconds, with more stable airflow and temperature distribution. It’s ideal for tasks like repairing mobile phones, where precision is important. For example, using this type on a 3508 CPU significantly reduces the risk of burning out. - **Digital Temperature Display Type**: This model adds a digital display for more accurate temperature readings. While some models are highly accurate, others may show incorrect values, leading to false confidence. The accuracy depends on the manufacturer, so it's wise to check reviews before purchasing. - **High-Temperature Type**: Designed for industrial use, these guns can reach up to 800°C or even 900°C. They require connection to a compressed air source or high-pressure air system for optimal performance. They often include built-in temperature sensors and anti-dry protection to prevent damage to the heating element when there’s no airflow.

**Third, Bosch Hot Air Gun Models Overview** Bosch offers a wide range of high-quality hot air guns designed for both professional and DIY use. Here are some popular models: 1. **Bosch GHG 600-3DCE** This 2000W hot air gun features a digital temperature display and stepless variable temperature control. Users can adjust temperature and airflow in 10-unit increments, making it ideal for precise operations. 2. **Bosch GBL 800E** Known for its powerful airflow, this model combines a blower and vacuum cleaner function. It has a strong motor and speed control, making it suitable for heavy-duty tasks.

3. **Bosch GHG 500-2** This compact model stores two common settings, allowing users to quickly switch between them. It also includes an automatic shut-off feature when overheating, ensuring long-term durability. 4. **Bosch GHG600-3** With a thermostat that supports temperatures of 50°C, 400°C, and 600°C, this model is great for bending plastic, removing paint, and shrinking heat shrink tubes. It’s also useful for soldering, tinning, and defrosting. 5. **Bosch GHG630DCE** A high-performance model with advanced temperature control and a durable design.

6. **Bosch GBH 2000 DRE** This model is known for its high power and efficiency, making it suitable for demanding applications.

8. **Bosch TBM 3500** A top-of-the-line model with advanced features and excellent performance, ideal for professional use.

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