This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
This circuit was found in a Mallory documentation from 1968. The integrated circuit is of the...
The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook. The...
Found in a 1995 Hands-On Electronics, this circuit generates a sinusoidal signal whose frequency...