In the figure we have the way to implement a sinusoidal oscillator with the 4093 IC. The component values are given by the table. The circuit is from a Popular Electronics from the 90s.
This good quality stereo amplifier was found in a Japanese publication from the 1960s. The circuit...
This circuit allows you to use the parallel PC interface to control LEDs. The circuit was found in...
This circuit, with printed circuit board, is from an article in Radio Electronics magazine from...