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This review is from: DEOK LM2596 DC 5/12V Adjustable Voltage Regulator Experimental Power 4.0-40V to 1.25-37V Buck Converter+LED Voltmeter (Electronics)
runs a raspberry Pi as a navigation computer on my boat. on depleted batteries I get just over 11 volts, when plugged into the mains and running off the battery charger I get about 12.5 and when the engines running full tilt I get just over 14volts from the alternator.... and the raspberry pi enjoys a steady 5volts.... none of the above I knew until I had the DEOK LM2596.... and now I watch the voltmeter and really know whats going on - whilst regulating the supply for my raspberry Pi. brilliant and value for money.