This circuit provides a signal that is twice the frequency of the input signal. The circuit was found in the April 1990 issue of Radio Electronics magazine.
This very high input impedance circuit is suggested by Texas Instruments. The circuit can be...
Texas Instruments SN74HCS32 Q1 2-input OR gate This Texas Instruments integrated circuit has 4...
This circuit was found in a Popular Electronics from the 90's. The transistors are general-purpose types...