AIDS key circuit with Hall transmitter

Published:2012/11/6 20:40:00 Author:Ecco | Keyword: AIDS key , Hall transmitter | From:SeekIC

It uses magnetic components or Hall element to form a non-contact switch. Figure a shows a simple structure. The circuit shown in Figure b uses the operational amplifier TAA861 with high amplification capability, two reverse magnetic fields input the pure signal to operational amplifier through the Hall element is twice of a magnetic field. In this magnetic circuit system, switch tap is near zero point of the magnetization curve to make the maximum inductance variation amount.



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