We found this circuit in a Popular Electronics from the 90s. It operates at a frequency of 15 kHz. Components can be difficult to obtain, such as the integrated circuit.
This circuit was originally suggested in a 1968 publication to generate a white mark (frame) on a...
This CMOS circuit was found in the July 1990 Radio Electronics magazine. Power is for a 12V...
This is the traditional configuration of an AND gate using an operational amplifier. Operational...