This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
This circuit comes from an English publication of 1976, consisting of an experimental touch key....
With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995...
This power source was found in a 1969’ Electronics World. The version is too sophisticated by the current it...