Metal detector receiver (CB22457E)

Found at Popular Electronics this receiver is used with a transmitter for quadrature-coil signals.

Audio compressor (CB7099E)
Found in the book 303 Circuits, this circuit compresses signals from 25 mV to 20 Vpp to...
Timing Comparator (CB14138E)
This circuit was obtained in the 1994 National Linear Application Handbook. The circuit admits other...
Diode Stabilized Wien Oscillator (CB14906E)
We found this configuration in a Radio Electronics from 1989. The circuit can be designed with...