With this circuit any number of 4017 integrated circuits can be connected in series. The circuit is from a Radio Electronics from April 1989.
We found this circuit in the November 1992 Radio Electronics magazine. It works with both...
This circuit came out in a Popular Electronics from December 1995. It is a Wien bridge...
The transistors of this filter found in a 1993 publication can be BF245 or MPF102. The filter...