This different circuit was patented and described in the Radio Electronics magazine of March 1958. In that section it used to present different configurations that received patents.
August 2016 - Mouser announced the availability of the new capacitors high voltage HV series...
This circuit was found in an English documentation from the 90's. The circuit has the frequencies...
This circuit is from a Radio Electronics from October 1963. The LDR and transistors are from the...