This Tesla coil was found in the November 1994 issue of Electronics Now magazine. T1 is a TV flyback transformer, but a car ignition coil can also be used.
This circuit was found in an old American documentation. The integrated circuit used is uncommon...
SST OXY Flex Oxygen Sensor The purpose of this SST sensor is to measure oxygen level in enclosed...
Circuits similar to this can be found in this section. This is from 1967 General Electric...