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A DC current limited ammeter protection circuit

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1 Author(s)
Smith, Charles E. ; Dept. of Electr. Eng., Mississippi Univ., MS, USA

Ammeters are always connected in series in the branch where a current is measured. Unfortunately, parallel connection can destroy a meter if connected by mistake, as often happens in introductory electric circuits instructional laboratories. To protect an ammeter from excessive currents caused by parallel connection, an op-amp/Zener diode circuit has been designed to effectively operate as a current-limited ammeter

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Education, IEEE Transactions on  (Volume:35 ,  Issue: 1 )