This circuit was obtained from 1967 documentation. It uses a sensor to determine the trigger point. The components are of the time, difficulty to obtain these days.
The circuit shown was obtained in American documentation from 1968. MOSFETs can be replaced by...
This circuit is from the 1990 Motorola Linear Databook. The integrated circuit used is the LF355,...
This negative ion generator was found in a 90s Popular Electronics. The autotransformer can be an...