2-Channel PWM Fan Speed Controller – LED Digital Thermostat 12V/24V

2-Channel PWM Fan Motor Speed Controller with LED Digital Thermostat

Take full command of your cooling setup with this 4-wire, 2-channel PWM Fan Temperature Controller. Featuring a bright LED digital display and dual independent temperature control channels, this compact board lets you automatically regulate fan speed based on real-time temperature readings — keeping your DC 12V or 24V fans running at exactly the right speed for optimal thermal management.

Key Features

• Wide Operating Voltage: DC 8–60V input range for broad compatibility across 12V and 24V systems
• Dual Independent Channels: Two separate temperature-controlled fan outputs, each with its own NTC thermistor probe (10K, B=3950)
• PWM Speed Control: 10%–100% output range for smooth, stepless fan speed adjustment
• LED Digital Display: Alternating readout of both channel temperatures at a glance
• Temperature Accuracy: Measures –9.9°C to 99.9°C; acceleration range 5–94°C, full-speed range 10–99°C
• Speed Monitoring: Displays fan RPM from 10–9,990 RPM (resolution: 10 RPM) for real-time feedback
• Stop Alarm Output: Optional external AC buzzer jack triggers when fan speed drops below 375 RPM
• Flexible Key Programming: Set low-speed threshold and temperature control zone via onboard buttons; settings are saved after power off
• Compact PCB: 65 × 65 × 15 mm board with 56 × 56 mm mounting hole pattern (3.2 mm diameter)
• Built with Plastic + Metal construction for durability

Technical Specifications

Wiring Guide

• Blue screw terminal: Connect to main power supply (voltage must match fan voltage, within 8–60V range)
• Channel 1 & Channel 2: 4-wire connection — (–) power, (+) power, speed feedback, PWM control
• Thermal 1 & Thermal 2: Connect NTC thermistors (10K, B=3950) for independent channel temperature sensing
• Beep jack: Connect an external AC buzzer for stop alarm notification

⚠️ Important: Always match power supply voltage to your fan's rated voltage. Applying 24V to a 12V fan will damage it.

What's in the Box

• 1 × PWM Fan Temperature Controller Board (complete set)

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Further Reading

For guidance on electrical safety with low-voltage DC electronics, visit the U.S. Consumer Product Safety Commission (CPSC). For standards on electrical and electronic components, see NIST – National Institute of Standards and Technology.

Frequently Asked Questions

Q: What fan types are compatible with this PWM fan speed controller?

A: This controller is designed for standard 4-wire PWM fans operating at DC 12V or 24V. It is compatible with the vast majority of PC and system fans that use a 2-pole speed signal. Always ensure your power supply voltage matches your fan's rated voltage — the board itself supports DC 8–60V input.

Q: Can I control fans with a current higher than 3A per channel?

A: Yes — for fans that draw more than 3A, you should connect the fan's power wires directly to the main power supply rather than through the board's fan interface pins. The board still provides PWM control and speed signal lines; only the high-current power wiring is bypassed to protect the board.

Q: How do I set the temperature thresholds for each channel?

A: Use the onboard keys to set both the low-speed threshold and the temperature control zone for each of the two independent channels. Acceleration temperature can be set from 5°C to 94°C, and full-speed temperature from 10°C to 99°C. All settings are saved in memory after programming, so they persist through power cycles.

Q: Does this controller work with 3-wire fans?

A: This controller is specifically designed for 4-wire PWM fans. While 3-wire fans can sometimes be connected, PWM speed control may not function correctly as 3-wire fans use voltage-based speed control rather than a PWM signal. For best results, use a 4-wire PWM-compatible fan.