This circuit was found in a Popular Electronics from the 90's. Its purpose is to detect the ionization of the air. The meter can be replaced by the current scale of an ordinary multimeter.
This circuit produces a signal in the range corresponding the the VHH channels between 2 and 6....
The circuit presented is from a 1969 Radiorama magazine (Italy), and can be designed with more...
The maximum power of the controlled load depends on the triac used. The circuit is from a Radio...