Fourth-Order High Pass Filter 741 (CB25597E)

This 100 Hz filter was found in the August 1993 issue of Electronics Now. The components can be modified to operate at other frequencies.

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Multiplexed mixer (CB20762E)
This configuration from the 1970s can be applied to modern equivalent operational amplifiers. The...
Residential Alarm (CB9884E)
This simple alarm using only transistors was found in a 1990 publication. It can be powered by D...
Zero Crossing Detector for Magnetic Transducer (CB14157E)
The circuit presented was found in the 1994 National Instruments Linear Applications Handbook and...