We found this circuit in an old documentation. The operational can be of any type and the frequency is given by the formula next to the diagram.
CTS IoT Quartz Crystals Available through Mouser Electronics, CTS quartz crystals are especially suited...
This circuit had its assembly described in a Radio Electronics from March 1963. The circuit uses 2...
This circuit is from a 1975 technical documentation on filters. The FET can be a BF245 and the...