The figure shows how to obtain a digitally programmed resistance using the 4066. The circuit is from a Radio Electronics from November 1989.
This is the receiver circuit for the PFM (pulse rate modulation) transmitter of the previous...
This 1975 tachometer for cars with platinum can serve as an idea for new projects. The components are...
This circuit is from a publication by Newton C. Braga in the United States. The transistor can be...