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.
We found this circuit in documentation from the 1970s; The circuit uses Japanese transistors of...
This circuit goes into operation producing a sound on a small speaker when the supply voltage...
Suggested by Harris in documentation from the 80s, this circuit uses components from that time. It...