The transistor on this mixer can be any general-purpose transistor. The number of entries can be changed. We found it in an old documentation. Input and output cables must be shielded.
The CK722 transistor used in this circuit is one of the first commercial types in the world. The...
This automatic dimmer for incandescent lamps was found in a European publication from the 1980s. The...
This traditional doubler configuration with the 555 can be found in other articles on the author’s site....