The datasheet touts the capabilities of the HW-133 module, and here is how they hold up in reality:
Before connecting your device, connect the input power and use a multimeter to measure the voltage across Set Voltage: Turn the small brass screw on the blue potentiometer. Hw-133-v1.0 Datasheet
: Some users have reported that input voltages above 24V (despite the 28V rating) can cause instability or failure if the output is under heavy load. Trimpot Adjustments The datasheet touts the capabilities of the HW-133
high-efficiency switching regulator, making it ideal for applications requiring a small footprint and low heat dissipation, such as RC aircraft, DIY electronics, and portable power solutions. Technical Specifications Value / Range Input Voltage 4.5V to 28V DC Output Voltage 0.8V to 20V DC (Adjustable via Trimpot) Output Current 3A Maximum Switching Frequency 1.0 MHz (Typical) up to 1.5 MHz Efficiency Operating Temperature -45°C to +85°C Dimensions 22mm x 17mm x 4mm Output Ripple Key Features High Power Density : Its compact size ( ) allows it to fit into extremely tight spaces. Precision Adjustment Technical Specifications Value / Range Input Voltage 4
Reviewing the HW-133-v1.0 datasheet is an exercise in patience. It typically arrives as a low-resolution PDF, often slightly blurred around the edges.
Experimental testing highlights several interesting characteristics that distinguish its practical use from basic paper specifications: