This circuit is from a 1969 Electronics World. It generates 100 kHz sinusoidal signals determined by the crystal. Capacitors must be ceramic.
The existence of field effect transistors at the input of the integrated circuit (operational...
This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms...
This circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...