12V DC PWM 4-Wire Fan Controller with Temperature Sensor and Stall Alarm What this product does - PWM fan speed controller for 12V DC 4-wire fans designed to provide precise, quiet cooling for PC CPU and electronic applications. - Measures temperature and adjusts fan speed automatically while monitoring fan rotation to detect stalls and trigger an alarm if RPM drops below the configured minimum. Key benefits and how it solves problems - Automatic temperature-based control reduces noise and power use by running fans only as fast as needed. - Stall alarm protects hardware by alerting you if a fan becomes blocked or fails, preventing overheating. - Wide speed range lets you find the right balance between airflow and acoustics for each setup. - Compact, durable design makes it easy to integrate into custom PCs, electronics enclosures, and cooling upgrades. Main features and specifications - Operating voltage: DC 12V. - PWM control for 4-wire fans. - Output range: 20% to 100% for the first channel or 40% to 100%. - Temperature sensor parameter: 50 KB = 3950. - Stall alarm threshold: minimum detectable speed approximately 700 to 800 RPM. - Small form factor for simple installation. - High-quality materials for stable performance and long service life. Compatibility and performance - Compatible with standard 4-wire PWM CPU and system fans that operate at 12V. - Suitable for PC CPU cooling, chassis fans, and small electronics cooling where PWM control and stall detection are required. - Stable PWM output ensures consistent fan behavior under varying thermal loads. What is included - Speed controller module x1. - Wiring x2. Practical use scenarios - Custom PC build: Use the controller to maintain lower noise levels when the system is idle and increase fan speed automatically under heavy CPU load. - Small server or workstation: Add temperature-based fan control and stall detection to protect components in 24/7 operation. - Electronics enclosure or DIY project: Manage cooling for single-board computers, power supplies, or motor drivers while receiving an alert if a fan is blocked. Quick installation notes - Connect the 4-wire fan to the controller following the supplied wiring. - Place the temperature sensor where it best represents the component temperature you want to control. - Verify alarm RPM threshold and fan compatibility during initial testing. This controller provides straightforward PWM speed control, temperature-responsive operation, and stall detection for reliable cooling and component protection.