Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the capacitors used. The circuit is from a Radio Electronics from December 1989.
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...