DC Fan Speed Controller Board USB-C, 3-Speed 5V 7V 9V Boost for Handheld Fans 3.7V Battery(Type-C)

9V Fan Motor Speed Controller Board Type C 3-Speed, Compact Boost Module for Small Battery-Powered Fans. Key benefits and why you need this board: - Allows a single low-voltage lithium cell to drive higher-voltage fan motors by boosting battery voltage to 5 V, 7 V, or 9 V, solving the problem of insufficient motor voltage in compact portable devices. - Extends device run time with extremely low standby current, reducing battery drain when the fan is idle. - Small footprint and integrated design make it easy to install in limited spaces, enabling upgrades or repairs of handheld fans and other small cooling devices. Main features: - Built-in boost conversion that raises a 3.7 V lithium battery up to selectable outputs of 5 V, 7 V, or 9 V to match different fan power requirements. - Three-speed control with LED indication: red LED for 5 V (gear 1), green LED for 7 V (gear 2), and blue LED for 9 V (gear 3). - Low standby current around 10 microamps to conserve battery life during idle periods. - Multi-voltage output support and an automatic fourth-level shutdown cycle. Maximum continuous output current should not exceed 0.6 A. - Type-C 5 V input for charging and external power. - Battery connector: PH2.0 female socket for connection to a 4.2 V ternary lithium cell or polymer lithium battery such as an 18650, with reverse-polarity protection at the battery end. - Fan connector: PH2.0 female socket compatible with brushless 5 to 8 inch motors, with reverse-polarity protection at the fan end and third-speed output of 9 V at approximately 600 mA. - Supports simultaneous charging and discharging when connected to a 3.7 V lithium battery with a 5 W charging source. - If no battery is connected, the board operates only in the lowest gear. Physical and installation details: - Product size: 35.6 mm by 27 mm. - Button height: 6 mm. - Mounting aperture diameter approximately 2.5 mm. - Input: Type-C 5 V. Output voltages: gear 1 = 5 V, gear 2 = 7 V, gear 3 = 9 V, gear 4 = shutdown cycle. - Note about wiring: the included cable may be prewired for shipment; when using this cable to connect the fan, you may need to reverse the red and black wires to match fan polarity. What is included: - Control board x1. - Cable x1. Practical applications: - Replace or upgrade the control board in a handheld rechargeable fan to add three-speed boost control and improve battery efficiency. - Build a compact DIY portable cooling device that requires selectable 5 V, 7 V, or 9 V fan supply from a single lithium cell. - Retrofit small battery-powered fans or hobby projects that use brushless 5 to 8 inch motors and PH2.0 connectors. This controller board is a compact, low-power solution to provide selectable boosted voltages, reliable reverse-polarity protection, and simple three-speed operation for small battery-powered fans and portable cooling projects.