Found in a 1968 Ferranti documentation, this circuit can be implemented with modern equivalent semiconductors. With the indicated components the load can be a lamp up to 1 A.
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...