This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook.
This tone generator for CW was found in a publication by Gernsback from 1960. The circuit makes use...
This circuit was obtained in an old US 1974 documentation when Nixie tube displays were common. The...
This circuit was found in an 80s National Semiconductor documentation. The configuration holds...