This circuit was found in the September 1984 issue of Radio Electronics magazine. The frequency is given by the capacitors. The diodes help in the starting process.
The crystal in this circuit is 32.758 kHz used in TV. The circuit was obtained in an English...
This circuit was obtained from an American publication of 1982, but can be easily assembled today...
As in the previous circuit (CB4052E), the relationship of values between the feedback and input...