This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
This circuit is from an 80's Electronic Engineering. The base is a common operating and 4 single...
Similar to other circuits found in this section, this circuit is from a 1996 Electronics World;...
This circuit switches the capacitors of a digital filter with the 4046 IC (PLL). The circuit was...