This circuit was found in an Electronics World of 1969. The circuit has a drain current of approximately 150 uA. The frequency generated is 1 MHz with the indicated components.
Found in a General Electric documentation from the 1980s, this circuit makes use of a FET...
This circuit is based on an MC1408, an integrated circuit that is not common today. The...
Another way to increase the sensitivity of the circuit with the amplification of the sensor...