This circuit, which can be built with several CMOS gates, was found in the March 1996 issue of Electronics Now magazine. The circuit has the base frequency determined by R1 and C1.
This circuit was found in a Radio Electronics magazine from October 1987. It can be used as a...
This setting appears elsewhere on this site. This was obtained from an 80's Circuit Encyclopedia and...
This circuit was found in an Electronic Design from the 90s. The circuit uses a type J...