Fault indicator (CB21396E)

This circuit was found in old American documentation. The operational amplifiers are from the period, but modern equivalents can be used.

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OR function with Relay (CB19773E)
The figure shows how to implement an OR function with two inputs, using a relay. The relay...
Metal detector receiver (CB22457E)
Found at Popular Electronics this receiver is used with a transmitter for quadrature-coil signals....
OptoMOS PLB171 Relay - Ixys
March 2017 - The integrated circuit division of IXYS is presented the integrated relay that makes...