Found in a September 1992 Radio Electronics magazine article, this circuit generates a pulse as shown in the graph below the diagram. The timings can be changed by swapping C3 and C7.
This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the...
This circuit is from a 2005 Linear Technology application manual. The circuit uses a commercial...
Found in an American paper from the 90's, this circuit can be adjusted to pass frequencies above 30 to 300...