This variable frequency oscillator with the 4093 was found in a Popular Electronics from the 90s. The table gives the component values for various frequency ranges.
Found in a 90s Electronic Design, this circuit provides a highly stable 60 Hz sine signal for...
This circuit is from an American publication of 1977. The tunnel diode admits equivalents and the...
This robot vision circuit was published in the December 1986 issue of Radio Electronics magazine. The...