The circuit shown uses an operational amplifier that is uncommon nowadays. The circuit was obtained in a 1994 Linear Applications Handbook by National Semiconductor.
This watch was found in 2001 documentation. The watch is powered by 4 batteries. To save energy, the...
This circuit is from Motorola's Linear Databook from 1990. The integrated circuit and transistors are...
This is one of many possible touch switch configurations using CMOS integrated circuits. The...