NOR Gate with Operational (CB19837E)

In the figure we have the way to implement a NO OR or NOR gate with an operational amplifier. The number of inputs can be changed.

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Latch for SCR (CB7245E)
This circuit is from a 1966 General Electric documentation. The circuit applies to sensitive SCRs for...
Tone Detector LM567 or NE567 (CB12666E)
In the figure a circuit that is the basic application of NE567 for the detection of a tone applied to...
Receiver for echo sounder (CB22357E)
Found in old documentation, this circuit is the receiver for the previous circuit. Components are...