Juan Ejea is an associate professor of electronics engineering with the University of Valencia, Spain. He received a PhD in electronics engineering from the University of Valencia. Email address: juan.b.ejea@uv.es
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November 17, 2005[Ideas For Design] Add Universal Protection For Sensitive Lab Circuits
Electronics lab experiments often use low-power control cards that can fail even in expert hands. These cards contain ICs that fail if the supply voltage exceeds a certain value or has an unsuitable polarity. Also, current must be limited to avoid damage to the card. Therefore, protection against inverted polarity, overvoltage, and overcurrent is needed. In our case, the control card that we wanted to protect consumed less than 50 mA, a negative input voltage wasn't allowed, and a sensitive...
