The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by resistors R1 and R2 as well as capacitors C1 and C2.
Vishay's VCNL4200 integrated circuit consists of a fully integrated proximity detector containing...
This circuit was originally intended for reading movie soundtracks. The circuit is from 1967 and...
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...