This power source was found in a 1969’ Electronics World. The version is too sophisticated by the current it supplies and can be implemented with modern transistors.
We find this circuit in a 1978 documentation. The circuit uses two inverters of a 4049 integrated...
We found this circuit in a 1986 documentation. Its purpose is to power a set of light bulbs (or...
For reference only, this is the second IF amplifier stage of a common transistor radio from the...