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RioRand Upgraded Adjustable DC Motor Speed PWM Controller 10V 12V 24V 30V Reversing Switch 120W: Amazon.com: Industrial & Scientific
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Amazon.com: PWM DC Motor Speed Controller,Brush Motor Driver Controls Module DC 9V-60V 12V 24V 36V 48V 60V Motor Pulse Width Modulator Regulator 20A 1200W PWM Monitor Dimmer Governor with Switch & Knob :
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100A PWM Solar Charger Controller, EEEkit Solar Panel Regulator Charge Controller Auto Focus Tracking, High Charging Efficiency, Dual USB, MCU Control, Build-in Timer(Orange) - Walmart.com
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