Permanent magnet detector (CB22463E)

We found this circuit in Popular Electronics from 1992. Transistors admit equivalents.

Pulse Amplifier Shield (CB16019E)
This circuit suggested by Texas Instruments, operates with pulses, and is based on an operational...
Series of Low Power Regulated DC DC Converters
August 2017 - Mouser Electronics announced the availability of a full range of Mean Well regulated DC-DC...
Guitar preamp (CB22146E) Found in an English publication from 1989, this circuit uses a still common operational amplifier. The power supply does not have to be symmetrical. a href="images/stories/bc/04291029"
Guitar preamp (CB22146E) Found in an English publication from 1989, this circuit uses a still...