This circuit was obtained from American documentation from 1966. It triggers when the two input voltages are within a pre-established range. The circuit can be mounted with modern transistors.
This circuit, from a 1986 Texas manual, appears elsewhere on this site, including in the form of a...
This audio oscillator operates like a signal injector in a frequency given by C1. The circuit was...
This circuit was originally designed to measure the gain of two-door RF MOSFETs as indicated by...