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Check the listing for details. PWM DC 12V 24V Motor Speed Controller regulator Adjustable Pulse Frequency Duty. Condition: New. Listed at 5.37 USD. Note that the high-power PWM driver (PP2 and PP2K type) is a MOS switch type output. When the load is not connected, there is no waveform, and the waveform is only after the load is connected. PWM mode - frequency (continuous), duty cycle.