This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the hard-to-obtain component of our day. It is for reference only.
This circuit is from the 1990 Motorola Linear Databook. The circuit can be implemented with other...
This circuit consists of an astable multivibrator whose frequency changes according to the light...
This touch switch appears elsewhere on this site from various documentation. This is from an 80's...