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Amazon.com: PWM Signal to Voltage Converter Module, 3.3V Pwm Signal to 0-5V Voltage Converter D/A DigitalAnalog Module Voltage Module Digital to Analog Engraving Machine : Electronics
Amazon.com: 0.7-5V to 3V 3.3V 5V DC DC Boost Converter Voltage Step-up Module (Output 3V no Pin) : Electronics
Amazon.com: ATX Power Supply Breakout Board and Acrylic Case Kit. with ADJ Adjustable Voltage Knob, Supports 3.3V, 5V, 12V and 1.5V-9.0V (ADJ) Output Voltage, 2A Maximum Output, Reset Protection. : Electronics