Alarm and current sensor (CB5285E)

This circuit is from Linear Technology 2005 documentation. The circuit is based on company components having a current limit warning output.

Audio Frequency Meter (CB20477E)
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...
Boat Alarm (CB4874S)
This circuit was found in an old European documentation. When R2 is cut off the circuit triggers...
Positive front differentiator (CB5346E)
This circuit for the positive front of a rectangular signal was found in an old documentation, but applies...