Found in a 1990s American documentation, this circuit provides an output voltage approximately 4 times that of the input voltage. Diodes are general-purpose types.
The LM109 is not a current integrated circuit, having been manufactured by many semiconductor...
This circuit was suggested in an article in Radio Electronics magazine in January 1992. Other...
We found this circuit in an old documentation. Transistor can be BC548 and relay according to...