Published with a power amplifier in the January 1985 issue of Radio Electronics, this circuit indicates overexcitation by a strong signal that causes distortion.
This circuit uses an operational amplifier to simulate an inductor. The circuit is from old...
This voltage level-triggered circuit was found in a 1969 Ferranti English documentation. Modern...
Found in a 90s General Electric documentation, this circuit has a drain current of just 1.5 uA....