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.
These circuits were found in Exar documentation from the 90s. The circuits use both a small...
This is the project was found in a 1982 publication. As shown in the figure, these are two...
This circuit is from a Popular Electronics from 1993. The magazine is no longer printed, but the...