This circuit simulates a resistor controlled by digital signals. We found it in American documentation from the 90s. The basic component is a CMOS 4016 or 4066 digital switch.
This circuit is from an Argentine publication from 1973. It generates a 100 kHz signal from a...
This filter was found in a 1975 American technical publication. The filter can be of any type and...
This circuit was found in a 90s American documentation. The circuit uses still common components...