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Polarity Protection. + D.U.T. –. (+). 1N5822 or 1N5817. Schottky diode. ( – ). + D.U.T. –. 1N4001. Standard rectifier -- fool proof. + D.U.T. –. (+). ( – ). Zener diode. Over-voltage Protection. Fuse (eg. 1A). 1N5339 (eg. 5.6V) Parts shop: 1N4734.
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Polarity Protection + D.U.T. – (+) 1N5822 or 1N5817 Schottky diode (–) + D.U.T. – 1N4001 Standard rectifier -- fool proof
+ D.U.T. – (+) (–) Zener diode Over-voltage Protection Fuse (eg. 1A) 1N5339 (eg. 5.6V) Parts shop: 1N4734
D.U.T. D.U.T. Providing Power Bench Supply Agilent E3631A BAD GOOD How much voltage provided? How much current drawn? You can’t limit current You know the voltage. You know the current drawn. You can limit current!!!
Devices D.U.T. = Device Under Test • Microprocessor (PIC, FPGA, DSP) • Transmitter/Receiver • Evaluation Board • Anything expensive
Sensors Need to protect your circuit from a sensor’s output? Need to protect your sensor from the rest of your circuit? Use an op-amp to source large currents to or from a sensor. Gain = 1 + (Rf / Rin)