This circuit was found in a 1967 Electronic Design and can be adapted to use modern equivalent components. The circuit provides a symmetrical voltage with the same value as the single input voltage.
The SN72741 integrated circuit is nothing more than the version of Texas Instruments of the known...
This circuit came out in a 1978 American publication, but can be assembled with transistors BC547 or...
Found in documentation for radio amateurs of the 70's, this circuit generates signals from 18 to 24...