This circuit, which can be used as a shield, was found in Radio Electronics from the 90s. The operating circuit can be replaced by a lower voltage equivalent.
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...