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.
The circuit is from a Radio Electronics from August 1989. The cells used at that time did not have...
This circuit for conventional lines was obtained in a 1996 documentation. The circuit uses common...
Equivalent operational amplifiers can be used in this circuit suggested by Motorola in its 1990...