This circuit was found in a Popular Electronics from the 90s. The circuit has temperature compensation. Coil and capacitors depend on the frequency at which the circuit will be used.
August 2017 - STMicroelectronics' BlueCoin development environment is available at Mouser...
We found this circuit in the January 1978 issue of Radio Electronics magazine. The integrated...
Found in a 90s Electronic Design, this circuit generates harmonics from a sinusoidal input signal....