Picoammeter (CB6192E)

This circuit was found in a 1980s Intersil documentation. The integrated circuit used is not common today. The power supply must be symmetrical.

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Isolated zero-crossing switch (CB7419E)
This circuit was obtained in a General Electric documentation from the 80's, and can be used as a...
Simple Timer (CB5154E)
This circuit appears in various parts of this site and this section, with diverse origins. This is from...
TL3780 Touch switch (COM137E)
November 2016 - The TL3780 ultra-miniature E-switch touch switches can now be obtained from Mouser...