In the figure we have the way to implement a logic gate or (OR) with an LM393. The circuit must be powered by a symmetrical source and other operational ones can be used.
This circuit provides a 60 Hz or 50 Hz precision clock or time base, depending on the network. It serves...
With the values of the indicated components, this oscillator produces a sinusoidal signal of 1...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...