Polarity Protection
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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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D u t

Polarity Protection

+

D.U.T.

(+)

1N5822 or 1N5817

Schottky diode

(–)

+

D.U.T.

1N4001

Standard rectifier

-- fool proof


D u t

+

D.U.T.

(+)

(–)

Zener diode

Over-voltage Protection

Fuse (eg. 1A)

1N5339 (eg. 5.6V)

Parts shop: 1N4734


D u t

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!!!


D u t

Devices

D.U.T. = Device Under Test

  • Microprocessor (PIC, FPGA, DSP)

  • Transmitter/Receiver

  • Evaluation Board

  • Anything expensive


D u t

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)


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